Degree Day Validation Challenge using degday R package

Introduction

This R-Notebook compares the estimated degree day values computed the degday R package with those from the UC IPM website. This is part of the Degree Days Validation Challenge.

Setup

Load R packages we’ll be using below:

library(dplyr)

library(readr)
library(kableExtra)

First, install the degday package if needed.

if (!require(degday)) {
  options(repos = c(ajlyons = 'https://ajlyons.r-universe.dev',
                  CRAN = 'https://cloud.r-project.org'))
  install.packages('degday')
  library(degday)
}

Loading required package: degday

packageVersion("degday")

[1] ‘0.4.0.9000’

Load the reference daily min-max temperature data:

refdata_tbl <- read_csv("https://raw.githubusercontent.com/UCANR-IGIS/degree-day-challenge/main/data/espartoa-weather-2020.csv")

Rows: 366 Columns: 4── Column specification ────────────────────────────────────────────────────────────────────────────────────────────
Delimiter: ","
chr  (1): station
dbl  (2): tmin, tmax
date (1): date
ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

refdata_tbl %>% slice(1:10)

Load the official answers:

answers_tbl <- read_csv("https://raw.githubusercontent.com/UCANR-IGIS/degree-day-challenge/main/data/ucipm_results/ucipm_low50_high70_all.csv")

Rows: 366 Columns: 15── Column specification ────────────────────────────────────────────────────────────────────────────────────────────
Delimiter: ","
chr  (1): date
dbl (14): tmin, tmax, sngsine_horiz, sngsine_vert, sngsine_intrmd, dblsine_horiz, dblsine_vert, dblsine_intrmd, ...
ℹ Use `spec()` to retrieve the full column specification for this data.
ℹ Specify the column types or set `show_col_types = FALSE` to quiet this message.

answers_tbl %>% slice(1:10)

Compute Single-Sine and Single-Triangle Methods

First define upper and lower thresholds:

thresh_low <- 50
thresh_up <- 70

First we compute degree days using the single-sine and single-triangle estimation methods. Here we use the dd_sng_tri and dd_sng_sine functions from degday.

refdata_sng_tbl <- refdata_tbl %>%
  mutate(sng_tri = dd_sng_tri(daily_min = tmin, daily_max = tmax, 
                              thresh_low = thresh_low, thresh_up = thresh_up),
         sng_sine = dd_sng_sine(daily_min = tmin, daily_max = tmax, 
                                thresh_low = thresh_low, thresh_up = thresh_up))

 - using single triangle method
 - using single sine method

refdata_sng_tbl %>% slice(1:10)

Compare Results

Here we compare the values generated by degday to the official answers.

Start by comparing we have the same number of rows:

nrow(refdata_sng_tbl) == nrow(answers_tbl)

[1] TRUE

Next we can display them side-by-side:

ddvals_answers_sng_tbl <- refdata_sng_tbl %>% 
  bind_cols(answers_tbl %>% select(sngsine_horiz, sngtri_horiz)) %>% 
  select(date, sng_tri, sngtri_horiz, sng_sine, sngsine_horiz)

ddvals_answers_sng_tbl %>% slice(1:20)

Inspect in a View window (uncomment and run in RStudio):

# ddvals_answers_sng_tbl %>% View()

Compute the difference between the values computed by degday and the official answers from UC IPM:

ddvals_answers_sng_tbl %>% 
  mutate(sngtri_diff = sng_tri - sngtri_horiz,
         sngsine_diff = sng_sine - sngsine_horiz) %>% 
  select(date, sng_tri, sngtri_horiz, sngtri_diff, sng_sine, sngsine_horiz, sngsine_diff) %>% 
  mutate(sngtri_diff = cell_spec(sngtri_diff,
                                 bold = sngtri_diff != 0,
                                 color = ifelse(sngtri_diff == 0, "black", "red")),
         sngsine_diff = cell_spec(sngsine_diff,
                                 bold = sngsine_diff != 0,
                                 color = ifelse(sngsine_diff == 0, "black", "red"))) %>% 
  kable(escape = FALSE) %>% 
  kable_styling()

date	sng_tri	sngtri_horiz	sngtri_diff	sng_sine	sngsine_horiz	sngsine_diff
2020-01-01	0.74	0.74	0	1.19	1.19	0
2020-01-02	4.66	4.66	0	5.71	5.71	0
2020-01-03	1.56	1.56	0	2.34	2.34	0
2020-01-04	1.84	1.84	0	2.56	2.56	0
2020-01-05	3.38	3.38	0	4.23	4.23	0
2020-01-06	1.45	1.45	0	2.13	2.13	0
2020-01-07	0.20	0.20	0	0.47	0.47	0
2020-01-08	0.00	0.00	0	0.00	0.00	0
2020-01-09	0.28	0.28	0	0.56	0.56	0
2020-01-10	0.54	0.54	0	1.01	1.01	0
2020-01-11	3.18	3.18	0	3.81	3.81	0
2020-01-12	1.22	1.23	-0.01	1.83	1.83	0
2020-01-13	1.68	1.68	0	2.31	2.31	0
2020-01-14	1.29	1.29	0	1.88	1.88	0
2020-01-15	0.02	0.03	-0.01	0.10	0.10	0
2020-01-16	1.68	1.68	0	2.31	2.31	0
2020-01-17	0.00	0.00	0	0.00	0.00	0
2020-01-18	0.42	0.42	0	0.80	0.80	0
2020-01-19	0.00	0.00	0	0.00	0.00	0
2020-01-20	0.32	0.32	0	0.60	0.60	0
2020-01-21	1.60	1.60	0	2.25	2.25	0
2020-01-22	2.78	2.78	0	3.38	3.38	0
2020-01-23	1.63	1.63	0	2.14	2.14	0
2020-01-24	2.63	2.63	0	3.28	3.28	0
2020-01-25	4.50	4.50	0	4.87	4.87	0
2020-01-26	10.50	10.50	0	10.50	10.50	0
2020-01-27	7.00	7.00	0	7.00	7.00	0
2020-01-28	5.54	5.54	0	5.62	5.62	0
2020-01-29	7.85	7.85	0	8.22	8.22	0
2020-01-30	6.02	6.02	0	6.66	6.66	0
2020-01-31	5.16	5.16	0	6.06	6.06	0
2020-02-01	5.78	5.78	0	6.49	6.49	0
2020-02-02	2.53	2.53	0	3.07	3.07	0
2020-02-03	0.83	0.83	0	1.27	1.27	0
2020-02-04	1.29	1.29	0	1.88	1.88	0
2020-02-05	2.82	2.82	0	3.82	3.82	0
2020-02-06	4.25	4.25	0	5.41	5.41	0
2020-02-07	3.52	3.52	0	4.60	4.60	0
2020-02-08	3.27	3.27	0	4.29	4.29	0
2020-02-09	5.14	5.14	0	5.33	5.33	0
2020-02-10	12.29	12.29	0	12.01	12.01	0
2020-02-11	10.00	10.00	0	10.00	10.00	0
2020-02-12	4.91	4.91	0	6.02	6.02	0
2020-02-13	3.63	3.63	0	4.69	4.69	0
2020-02-14	4.57	4.57	0	5.50	5.50	0
2020-02-15	4.41	4.41	0	5.39	5.39	0
2020-02-16	8.03	8.03	0	8.10	8.10	0
2020-02-17	11.97	11.97	0	11.90	11.90	0
2020-02-18	6.28	6.28	0	6.84	6.84	0
2020-02-19	4.66	4.66	0	5.71	5.71	0
2020-02-20	5.16	5.16	0	6.06	6.06	0
2020-02-21	8.24	8.24	0	8.79	8.79	0
2020-02-22	9.70	9.70	0	9.79	9.79	0
2020-02-23	4.45	4.45	0	5.13	5.13	0
2020-02-24	8.11	8.11	0	8.71	8.72	-0.00999999999999979
2020-02-25	11.33	11.33	0	10.94	10.94	0
2020-02-26	8.57	8.57	0	9.03	9.03	0
2020-02-27	10.00	10.00	0	10.00	10.00	0
2020-02-28	9.03	9.03	0	9.33	9.33	0
2020-02-29	9.50	9.50	0	9.50	9.50	0
2020-03-01	4.50	4.50	0	4.87	4.87	0
2020-03-02	10.91	10.91	0	10.74	10.74	0
2020-03-03	12.00	12.00	0	11.37	11.37	0
2020-03-04	9.44	9.44	0	9.62	9.62	0
2020-03-05	8.24	8.24	0	8.79	8.79	0
2020-03-06	4.23	4.23	0	4.83	4.83	0
2020-03-07	2.27	2.27	0	3.02	3.02	0
2020-03-08	1.45	1.45	0	2.13	2.13	0
2020-03-09	6.74	6.74	0	7.01	7.01	0
2020-03-10	8.89	8.89	0	9.25	9.25	0
2020-03-11	8.12	8.13	-0.0100000000000016	8.70	8.70	0
2020-03-12	11.67	11.67	0	11.13	11.13	0
2020-03-13	6.75	6.75	0	7.31	7.31	0
2020-03-14	1.25	1.25	0	1.59	1.59	0
2020-03-15	1.14	1.14	0	1.51	1.51	0
2020-03-16	0.00	0.00	0	0.00	0.00	0
2020-03-17	0.89	0.89	0	1.32	1.32	0
2020-03-18	0.45	0.45	0	0.72	0.72	0
2020-03-19	2.42	2.42	0	3.26	3.26	0
2020-03-20	3.38	3.38	0	4.37	4.37	0
2020-03-21	4.74	4.74	0	5.62	5.62	0
2020-03-22	6.22	6.22	0	7.09	7.09	0
2020-03-23	5.62	5.63	-0.00999999999999979	6.09	6.09	0
2020-03-24	1.78	1.78	0	2.38	2.38	0
2020-03-25	1.17	1.17	0	1.78	1.78	0
2020-03-26	2.24	2.24	0	3.12	3.12	0
2020-03-27	3.02	3.02	0	3.97	3.97	0
2020-03-28	2.67	2.67	0	3.02	3.02	0
2020-03-29	4.50	4.50	0	4.87	4.87	0
2020-03-30	6.57	6.57	0	7.04	7.04	0
2020-03-31	11.90	11.90	0	11.73	11.73	0
2020-04-01	6.40	6.40	0	6.78	6.78	0
2020-04-02	7.85	7.85	0	8.22	8.22	0
2020-04-03	5.35	5.35	0	6.19	6.19	0
2020-04-04	1.63	1.63	0	2.14	2.14	0
2020-04-05	1.64	1.64	0	2.01	2.01	0
2020-04-06	2.13	2.13	0	2.78	2.78	0
2020-04-07	5.33	5.33	0	6.03	6.03	0
2020-04-08	4.90	4.90	0	5.44	5.44	0
2020-04-09	6.53	6.53	0	6.61	6.61	0
2020-04-10	11.80	11.80	0	11.52	11.52	0
2020-04-11	9.60	9.60	0	9.70	9.70	0
2020-04-12	10.71	10.71	0	10.51	10.51	0
2020-04-13	11.72	11.72	0	11.23	11.23	0
2020-04-14	13.78	13.78	0	12.91	12.91	0
2020-04-15	11.05	11.05	0	10.71	10.71	0
2020-04-16	12.90	12.90	0	12.08	12.08	0
2020-04-17	11.30	11.30	0	11.03	11.03	0
2020-04-18	9.52	9.52	0	9.59	9.59	0
2020-04-19	8.00	8.00	0	8.58	8.58	0
2020-04-20	9.52	9.52	0	9.59	9.59	0
2020-04-21	10.91	10.91	0	10.62	10.62	0
2020-04-22	12.14	12.14	0	11.55	11.55	0
2020-04-23	17.58	17.58	0	16.74	16.74	0
2020-04-24	16.44	16.44	0	15.24	15.24	0
2020-04-25	19.06	19.06	0	18.41	18.41	0
2020-04-26	16.62	16.62	0	15.63	15.63	0
2020-04-27	15.48	15.48	0	14.40	14.40	0
2020-04-28	18.55	18.55	0	17.76	17.76	0
2020-04-29	16.87	16.87	0	15.95	15.95	0
2020-04-30	18.40	18.40	0	17.75	17.75	0
2020-05-01	15.18	15.18	0	14.18	14.18	0
2020-05-02	14.72	14.72	0	14.44	14.44	0
2020-05-03	12.14	12.14	0	11.55	11.55	0
2020-05-04	12.94	12.94	0	12.06	12.06	0
2020-05-05	13.14	13.14	0	12.20	12.20	0
2020-05-06	14.69	14.69	0	13.55	13.55	0
2020-05-07	15.18	15.18	0	14.18	14.18	0
2020-05-08	16.05	16.05	0	14.68	14.68	0
2020-05-09	15.49	15.49	0	14.13	14.13	0
2020-05-10	14.60	14.60	0	13.63	13.63	0
2020-05-11	10.00	10.00	0	10.00	10.00	0
2020-05-12	15.09	15.09	0	13.98	13.98	0
2020-05-13	16.00	16.00	0	14.91	14.91	0
2020-05-14	10.00	10.00	0	10.00	10.00	0
2020-05-15	15.74	15.74	0	15.00	15.00	0
2020-05-16	17.37	17.37	0	16.72	16.72	0
2020-05-17	16.25	16.25	0	15.23	15.23	0
2020-05-18	10.50	10.50	0	10.50	10.50	0
2020-05-19	11.80	11.80	0	11.52	11.52	0
2020-05-20	11.03	11.03	0	10.73	10.73	0
2020-05-21	15.18	15.18	0	14.18	14.18	0
2020-05-22	13.77	13.77	0	13.05	13.05	0
2020-05-23	17.52	17.52	0	16.57	16.57	0
2020-05-24	16.29	16.29	0	14.99	14.99	0
2020-05-25	17.83	17.83	0	16.69	16.69	0
2020-05-26	19.36	19.36	0	18.70	18.70	0
2020-05-27	19.76	19.76	0	19.41	19.41	0
2020-05-28	18.33	18.33	0	17.23	17.23	0
2020-05-29	17.36	17.36	0	16.32	16.32	0
2020-05-30	17.71	17.71	0	17.25	17.25	0
2020-05-31	16.57	16.57	0	15.87	15.87	0
2020-06-01	18.08	18.08	0	17.25	17.25	0
2020-06-02	18.57	18.57	0	17.66	17.66	0
2020-06-03	19.34	19.34	0	18.68	18.68	0
2020-06-04	18.68	18.68	0	17.76	17.76	0
2020-06-05	17.00	17.00	0	16.18	16.18	0
2020-06-06	16.40	16.40	0	15.75	15.75	0
2020-06-07	17.27	17.27	0	16.25	16.25	0
2020-06-08	17.12	17.12	0	16.27	16.27	0
2020-06-09	16.79	16.79	0	15.62	15.62	0
2020-06-10	19.26	19.26	0	18.60	18.60	0
2020-06-11	18.22	18.22	0	17.25	17.25	0
2020-06-12	16.00	16.00	0	15.47	15.47	0
2020-06-13	14.89	14.89	0	14.26	14.26	0
2020-06-14	17.58	17.58	0	16.74	16.74	0
2020-06-15	19.38	19.38	0	18.91	18.91	0
2020-06-16	17.62	17.62	0	16.90	16.90	0
2020-06-17	19.22	19.22	0	18.66	18.66	0
2020-06-18	18.27	18.27	0	17.29	17.29	0
2020-06-19	18.11	18.11	0	17.04	17.04	0
2020-06-20	17.20	17.20	0	16.07	16.07	0
2020-06-21	18.22	18.22	0	17.25	17.25	0
2020-06-22	18.49	18.49	0	17.48	17.48	0
2020-06-23	19.47	19.47	0	18.91	18.91	0
2020-06-24	19.14	19.14	0	18.38	18.38	0
2020-06-25	18.57	18.57	0	17.66	17.66	0
2020-06-26	18.32	18.32	0	17.33	17.33	0
2020-06-27	18.57	18.57	0	17.66	17.66	0
2020-06-28	17.84	17.84	0	16.94	16.94	0
2020-06-29	19.46	19.46	0	18.99	18.99	0
2020-06-30	18.39	18.39	0	17.50	17.50	0
2020-07-01	16.96	16.96	0	15.76	15.76	0
2020-07-02	16.59	16.59	0	15.48	15.48	0
2020-07-03	19.06	19.06	0	18.31	18.31	0
2020-07-04	16.39	16.39	0	15.06	15.06	0
2020-07-05	18.05	18.05	0	16.99	16.99	0
2020-07-06	17.12	17.12	0	16.00	16.00	0
2020-07-07	15.99	15.99	0	14.76	14.76	0
2020-07-08	19.57	19.57	0	19.10	19.10	0
2020-07-09	18.91	18.91	0	18.07	18.07	0
2020-07-10	18.68	18.68	0	17.76	17.76	0
2020-07-11	18.62	18.63	-0.00999999999999801	17.60	17.60	0
2020-07-12	18.56	18.56	0	17.54	17.54	0
2020-07-13	18.69	18.69	0	17.88	17.88	0
2020-07-14	17.88	17.88	0	16.85	16.85	0
2020-07-15	18.11	18.11	0	17.04	17.04	0
2020-07-16	19.00	19.00	0	18.26	18.26	0
2020-07-17	18.73	18.73	0	17.91	17.91	0
2020-07-18	18.61	18.61	0	17.69	17.69	0
2020-07-19	18.88	18.88	0	18.04	18.04	0
2020-07-20	18.61	18.61	0	17.69	17.69	0
2020-07-21	18.22	18.22	0	17.25	17.25	0
2020-07-22	18.61	18.61	0	17.69	17.69	0
2020-07-23	17.42	17.42	0	16.24	16.24	0
2020-07-24	18.00	18.00	0	16.95	16.95	0
2020-07-25	17.19	17.19	0	15.93	15.93	0
2020-07-26	18.75	18.75	0	17.82	17.82	0
2020-07-27	18.99	18.99	0	18.14	18.14	0
2020-07-28	18.52	18.52	0	17.51	17.51	0
2020-07-29	18.61	18.61	0	17.69	17.69	0
2020-07-30	18.61	18.61	0	17.69	17.69	0
2020-07-31	16.40	16.40	0	14.94	14.94	0
2020-08-01	16.48	16.48	0	15.13	15.13	0
2020-08-02	18.20	18.20	0	17.12	17.12	0
2020-08-03	18.72	18.72	0	17.79	17.79	0
2020-08-04	18.05	18.05	0	16.99	16.99	0
2020-08-05	18.32	18.32	0	17.33	17.33	0
2020-08-06	17.12	17.12	0	16.00	16.00	0
2020-08-07	18.84	18.84	0	18.01	18.01	0
2020-08-08	19.03	19.03	0	18.28	18.28	0
2020-08-09	19.11	19.11	0	18.36	18.36	0
2020-08-10	19.49	19.49	0	18.93	18.93	0
2020-08-11	18.73	18.73	0	17.91	17.91	0
2020-08-12	17.89	17.89	0	16.74	16.74	0
2020-08-13	18.65	18.65	0	17.73	17.73	0
2020-08-14	20.00	20.00	0	20.00	20.00	0
2020-08-15	19.95	19.95	0	19.81	19.81	0
2020-08-16	18.61	18.61	0	17.69	17.69	0
2020-08-17	18.32	18.32	0	17.33	17.33	0
2020-08-18	20.00	20.00	0	20.00	20.00	0
2020-08-19	20.00	20.00	0	20.00	20.00	0
2020-08-20	18.61	18.61	0	17.92	17.92	0
2020-08-21	18.11	18.11	0	17.16	17.16	0
2020-08-22	19.85	19.85	0	19.59	19.59	0
2020-08-23	18.88	18.88	0	18.04	18.04	0
2020-08-24	19.84	19.84	0	19.59	19.59	0
2020-08-25	18.00	18.00	0	16.95	16.95	0
2020-08-26	18.05	18.05	0	16.99	16.99	0
2020-08-27	16.63	16.63	0	15.38	15.38	0
2020-08-28	18.27	18.27	0	17.29	17.29	0
2020-08-29	18.77	18.77	0	17.95	17.95	0
2020-08-30	18.39	18.39	0	17.50	17.50	0
2020-08-31	18.61	18.61	0	17.69	17.69	0
2020-09-01	18.48	18.48	0	17.58	17.58	0
2020-09-02	18.15	18.15	0	17.31	17.31	0
2020-09-03	17.78	17.78	0	16.65	16.65	0
2020-09-04	17.94	17.94	0	16.78	16.78	0
2020-09-05	18.57	18.57	0	17.66	17.66	0
2020-09-06	19.88	19.88	0	19.64	19.64	0
2020-09-07	17.94	17.94	0	16.90	16.90	0
2020-09-08	17.94	17.94	0	16.90	16.90	0
2020-09-09	17.76	17.76	0	16.88	16.88	0
2020-09-10	15.50	15.50	0	14.69	14.69	0
2020-09-11	15.62	15.62	0	14.50	14.50	0
2020-09-12	17.88	17.88	0	16.85	16.85	0
2020-09-13	16.59	16.59	0	15.48	15.48	0
2020-09-14	17.75	17.75	0	16.75	16.75	0
2020-09-15	17.44	17.44	0	16.38	16.38	0
2020-09-16	15.74	15.74	0	14.44	14.44	0
2020-09-17	15.85	15.85	0	14.52	14.52	0
2020-09-18	17.83	17.83	0	17.06	17.06	0
2020-09-19	17.43	17.43	0	16.50	16.50	0
2020-09-20	16.79	16.79	0	15.62	15.62	0
2020-09-21	16.44	16.44	0	15.24	15.24	0
2020-09-22	18.33	18.33	0	17.46	17.46	0
2020-09-23	16.79	16.79	0	15.62	15.62	0
2020-09-24	19.06	19.06	0	18.41	18.41	0
2020-09-25	15.48	15.48	0	14.40	14.40	0
2020-09-26	17.75	17.75	0	16.75	16.75	0
2020-09-27	20.00	20.00	0	20.00	20.00	0
2020-09-28	19.98	19.98	0	19.92	19.92	0
2020-09-29	17.12	17.12	0	15.88	15.88	0
2020-09-30	17.77	17.77	0	16.53	16.53	0
2020-10-01	18.97	18.97	0	18.23	18.23	0
2020-10-02	17.44	17.44	0	16.38	16.38	0
2020-10-03	16.37	16.37	0	15.31	15.31	0
2020-10-04	15.59	15.59	0	14.61	14.61	0
2020-10-05	15.60	15.60	0	14.21	14.21	0
2020-10-06	15.70	15.70	0	14.29	14.29	0
2020-10-07	15.12	15.12	0	13.86	13.86	0
2020-10-08	13.77	13.77	0	13.05	13.05	0
2020-10-09	15.34	15.34	0	14.29	14.29	0
2020-10-10	14.64	14.64	0	14.10	14.10	0
2020-10-11	15.98	15.98	0	15.03	15.03	0
2020-10-12	14.99	14.99	0	13.76	13.76	0
2020-10-13	14.63	14.63	0	13.29	13.29	0
2020-10-14	17.65	17.65	0	16.55	16.55	0
2020-10-15	19.81	19.81	0	19.54	19.54	0
2020-10-16	17.94	17.94	0	16.90	16.90	0
2020-10-17	16.39	16.39	0	15.06	15.06	0
2020-10-18	15.49	15.49	0	14.13	14.13	0
2020-10-19	15.62	15.62	0	14.36	14.36	0
2020-10-20	15.74	15.74	0	14.44	14.44	0
2020-10-21	15.99	15.99	0	14.76	14.76	0
2020-10-22	12.67	12.67	0	11.92	11.92	0
2020-10-23	10.26	10.26	0	10.17	10.17	0
2020-10-24	10.00	10.00	0	10.00	10.00	0
2020-10-25	9.09	9.09	0	9.26	9.26	0
2020-10-26	13.26	13.26	0	12.99	12.99	0
2020-10-27	10.29	10.29	0	10.19	10.19	0
2020-10-28	8.00	8.00	0	8.65	8.65	0
2020-10-29	9.52	9.52	0	9.68	9.68	0
2020-10-30	9.74	9.74	0	9.83	9.83	0
2020-10-31	10.26	10.26	0	10.17	10.17	0
2020-11-01	9.74	9.74	0	9.83	9.83	0
2020-11-02	12.11	12.11	0	11.43	11.43	0
2020-11-03	9.73	9.73	0	9.82	9.82	0
2020-11-04	10.56	10.56	0	10.38	10.38	0
2020-11-05	11.35	11.35	0	10.91	10.91	0
2020-11-06	9.57	9.57	0	9.66	9.66	0
2020-11-07	8.80	8.80	0	9.11	9.11	0
2020-11-08	3.68	3.68	0	3.87	3.87	0
2020-11-09	1.39	1.39	0	2.08	2.08	0
2020-11-10	2.49	2.49	0	3.56	3.56	0
2020-11-11	6.57	6.57	0	7.04	7.04	0
2020-11-12	2.49	2.49	0	3.56	3.56	0
2020-11-13	1.75	1.75	0	2.23	2.23	0
2020-11-14	2.52	2.52	0	3.33	3.33	0
2020-11-15	5.47	5.47	0	6.56	6.56	0
2020-11-16	5.40	5.40	0	6.37	6.37	0
2020-11-17	4.67	4.67	0	5.28	5.28	0
2020-11-18	5.11	5.11	0	5.74	5.74	0
2020-11-19	4.02	4.02	0	4.69	4.69	0
2020-11-20	4.27	4.27	0	5.29	5.29	0
2020-11-21	4.02	4.02	0	4.69	4.69	0
2020-11-22	3.31	3.31	0	4.45	4.45	0
2020-11-23	4.27	4.27	0	5.29	5.29	0
2020-11-24	4.33	4.33	0	5.19	5.19	0
2020-11-25	3.84	3.84	0	4.56	4.56	0
2020-11-26	7.00	7.00	0	7.00	7.00	0
2020-11-27	2.57	2.57	0	3.50	3.50	0
2020-11-28	2.80	2.80	0	3.93	3.93	0
2020-11-29	2.80	2.80	0	3.93	3.93	0
2020-11-30	3.91	3.91	0	5.16	5.16	0
2020-12-01	2.75	2.75	0	3.50	3.50	0
2020-12-02	4.75	4.75	0	6.05	6.05	0
2020-12-03	2.38	2.38	0	3.10	3.10	0
2020-12-04	5.01	5.01	0	6.24	6.24	0
2020-12-05	2.32	2.32	0	3.31	3.31	0
2020-12-06	4.82	4.82	0	5.82	5.82	0
2020-12-07	14.37	14.37	0	14.19	14.19	0
2020-12-08	5.47	5.47	0	6.56	6.56	0
2020-12-09	2.63	2.63	0	3.28	3.28	0
2020-12-10	6.94	6.94	0	7.59	7.59	0
2020-12-11	0.78	0.78	0	1.23	1.23	0
2020-12-12	1.53	1.53	0	2.07	2.07	0
2020-12-13	0.67	0.67	0	1.02	1.02	0
2020-12-14	1.45	1.45	0	2.13	2.13	0
2020-12-15	0.95	0.95	0	1.48	1.48	0
2020-12-16	0.69	0.69	0	1.15	1.15	0
2020-12-17	2.38	2.38	0	2.96	2.96	0
2020-12-18	0.90	0.90	0	1.44	1.44	0
2020-12-19	1.19	1.19	0	1.91	1.91	0
2020-12-20	0.28	0.28	0	0.56	0.56	0
2020-12-21	0.00	0.00	0	0.00	0.00	0
2020-12-22	2.27	2.27	0	3.02	3.02	0
2020-12-23	0.54	0.54	0	1.01	1.01	0
2020-12-24	0.52	0.52	0	0.99	0.99	0
2020-12-25	0.47	0.47	0	0.84	0.84	0
2020-12-26	3.36	3.36	0	3.94	3.94	0
2020-12-27	0.44	0.44	0	0.82	0.82	0
2020-12-28	0.50	0.50	0	0.87	0.87	0
2020-12-29	0.50	0.50	0	0.87	0.87	0
2020-12-30	0.50	0.50	0	0.87	0.87	0
2020-12-31	0.74	0.74	0	1.19	1.19	0

CONCLUSION: It looks like the answers align to within 2 decimal places.

Compute Double-Triangle and Double-Sine Values

Next we estimate degree days using the double-triangle and double-sine methods. As illustrated on the degday Getting Started page, this requires that we add the next-day temperature to the table.

refdata_wthnxtday_tbl <- refdata_tbl %>%
  mutate(tmin_next = lead(tmin, n = 1)) 

refdata_wthnxtday_tbl %>% head()

Now compute estimated degree days using dd_dbl_tri and dd_dbl_sine functions from degday.

refdata_dbl_tbl <- refdata_wthnxtday_tbl %>%
  mutate(dbl_tri = dd_dbl_tri(daily_min = tmin, daily_max = tmax, nextday_min = tmin_next,
                              thresh_low = thresh_low, thresh_up = thresh_up),
         dbl_sine = dd_dbl_sine(daily_min = tmin, daily_max = tmax, nextday_min = tmin_next,
                                thresh_low = thresh_low, thresh_up = thresh_up))  

 - using double triangle method
 - using double sine method

refdata_dbl_tbl %>% slice(1:10)

Compare Results

Here we compare the values generated by degday to the official answers.

Start by comparing we have the same number of rows:

nrow(refdata_dbl_tbl) == nrow(answers_tbl)

[1] TRUE

 

Next we can display them side-by-side:

ddvals_answers_dbl_tbl <- refdata_dbl_tbl %>% 
  bind_cols(answers_tbl %>% select(dblsine_horiz, dbltri_horiz)) %>% 
  select(date, dbl_tri, dbltri_horiz, dbl_sine, dblsine_horiz)

ddvals_answers_dbl_tbl %>% slice(1:20)

Compute the difference between the values computed by degday and the official answers from UC IPM:

ddvals_answers_dbl_tbl %>% 
  mutate(dbltri_diff = dbl_tri - dbltri_horiz,
         dblsine_diff = dbl_sine - dblsine_horiz) %>% 
  select(date, dbl_tri, dbltri_horiz, dbltri_diff, dbl_sine, dblsine_horiz, dblsine_diff) %>% 
  mutate(dbltri_diff = cell_spec(dbltri_diff,
                                 bold = dbltri_diff != 0,
                                 color = ifelse(dbltri_diff == 0, "black", "red")),
         dblsine_diff = cell_spec(dblsine_diff,
                                 bold = dblsine_diff != 0,
                                 color = ifelse(dblsine_diff == 0, "black", "red"))) %>% 
  kable(escape = FALSE) %>% 
  kable_styling()

date	dbl_tri	dbltri_horiz	dbltri_diff	dbl_sine	dblsine_horiz	dblsine_diff
2020-01-01	0.70	0.70	0	1.15	1.15	0
2020-01-02	4.46	4.46	0	5.56	5.56	0
2020-01-03	1.70	1.70	0	2.45	2.45	0
2020-01-04	1.88	1.88	0	2.59	2.59	0
2020-01-05	3.25	3.25	0	4.14	4.14	0
2020-01-06	1.30	1.30	0	2.00	2.00	0
2020-01-07	0.29	0.29	0	0.56	0.56	0
2020-01-08	0.00	0.00	0	0.00	0.00	0
2020-01-09	0.25	0.25	0	0.53	0.53	0
2020-01-10	0.75	0.75	0	1.19	1.19	0
2020-01-11	2.85	2.85	0	3.57	3.57	0
2020-01-12	1.29	1.29	0	1.88	1.88	0
2020-01-13	1.64	1.64	0	2.28	2.28	0
2020-01-14	1.12	1.12	0	1.73	1.73	0
2020-01-15	0.03	0.03	0	0.11	0.11	0
2020-01-16	1.51	1.51	0	2.17	2.17	0
2020-01-17	0.00	0.00	0	0.00	0.00	0
2020-01-18	0.43	0.43	0	0.81	0.81	0
2020-01-19	0.00	0.00	0	0.00	0.00	0
2020-01-20	0.31	0.31	0	0.59	0.59	0
2020-01-21	1.80	1.80	0	2.40	2.40	0
2020-01-22	2.78	2.78	0	3.38	3.38	0
2020-01-23	1.58	1.58	0	2.10	2.10	0
2020-01-24	3.10	3.10	0	3.61	3.61	0
2020-01-25	6.25	6.25	0	6.44	6.44	0
2020-01-26	9.50	9.50	0	9.50	9.50	0
2020-01-27	6.77	6.77	0	6.81	6.81	0
2020-01-28	5.02	5.02	0	5.25	5.25	0
2020-01-29	7.40	7.40	0	7.90	7.90	0
2020-01-30	5.59	5.59	0	6.36	6.36	0
2020-01-31	5.47	5.47	0	6.27	6.27	0
2020-02-01	5.90	5.90	0	6.57	6.57	0
2020-02-02	2.33	2.33	0	2.92	2.92	0
2020-02-03	0.78	0.78	0	1.23	1.23	0
2020-02-04	1.16	1.16	0	1.77	1.77	0
2020-02-05	2.82	2.82	0	3.82	3.82	0
2020-02-06	4.25	4.25	0	5.41	5.41	0
2020-02-07	3.57	3.57	0	4.64	4.64	0
2020-02-08	4.70	4.70	0	5.29	5.29	0
2020-02-09	6.07	6.07	0	6.16	6.16	0
2020-02-10	10.63	10.63	0	10.64	10.64	0
2020-02-11	8.90	8.90	0	9.26	9.26	0
2020-02-12	4.84	4.84	0	5.97	5.97	0
2020-02-13	3.90	3.90	0	4.88	4.88	0
2020-02-14	4.49	4.49	0	5.45	5.45	0
2020-02-15	5.97	5.97	0	6.50	6.50	0
2020-02-16	9.01	9.01	0	9.05	9.05	0
2020-02-17	10.06	10.06	0	10.27	10.27	0
2020-02-18	5.47	5.47	0	6.27	6.27	0
2020-02-19	4.91	4.91	0	5.88	5.88	0
2020-02-20	5.26	5.26	0	6.13	6.13	0
2020-02-21	8.63	8.63	0	9.06	9.06	0
2020-02-22	9.55	9.55	0	9.70	9.70	0
2020-02-23	4.11	4.11	0	4.89	4.89	0
2020-02-24	9.41	9.41	0	9.61	9.61	0
2020-02-25	10.26	10.26	0	10.19	10.19	0
2020-02-26	8.97	8.97	0	9.30	9.30	0
2020-02-27	10.00	10.00	0	10.00	10.00	0
2020-02-28	10.35	10.35	0	10.31	10.31	0
2020-02-29	8.67	8.67	0	8.86	8.86	0
2020-03-01	5.25	5.25	0	5.44	5.44	0
2020-03-02	10.07	10.07	0	10.09	10.09	0
2020-03-03	11.25	11.25	0	10.85	10.85	0
2020-03-04	9.32	9.32	0	9.54	9.54	0
2020-03-05	8.63	8.63	0	9.06	9.06	0
2020-03-06	3.80	3.80	0	4.53	4.53	0
2020-03-07	2.18	2.18	0	2.94	2.94	0
2020-03-08	2.18	2.18	0	2.66	2.66	0
2020-03-09	5.83	5.83	0	6.38	6.38	0
2020-03-10	9.02	9.02	0	9.33	9.33	0
2020-03-11	8.71	8.71	0	9.09	9.09	0
2020-03-12	11.51	11.51	0	11.02	11.02	0
2020-03-13	6.90	6.90	0	7.41	7.41	0
2020-03-14	1.19	1.19	0	1.55	1.55	0
2020-03-15	0.96	0.96	0	1.37	1.37	0
2020-03-16	0.00	0.00	0	0.00	0.00	0
2020-03-17	0.97	0.97	0	1.38	1.38	0
2020-03-18	0.36	0.36	0	0.63	0.63	0
2020-03-19	2.37	2.37	0	3.22	3.22	0
2020-03-20	3.65	3.65	0	4.56	4.56	0
2020-03-21	4.83	4.83	0	5.68	5.68	0
2020-03-22	6.87	6.87	0	7.54	7.54	0
2020-03-23	5.06	5.06	0	5.70	5.70	0
2020-03-24	1.62	1.62	0	2.26	2.26	0
2020-03-25	1.12	1.12	0	1.74	1.74	0
2020-03-26	2.28	2.28	0	3.15	3.15	0
2020-03-27	3.99	3.99	0	4.66	4.66	0
2020-03-28	2.67	2.67	0	3.02	3.02	0
2020-03-29	4.37	4.37	0	4.78	4.78	0
2020-03-30	8.03	8.03	0	8.27	8.27	0
2020-03-31	10.57	10.57	0	10.58	10.58	0
2020-04-01	6.40	6.40	0	6.78	6.78	0
2020-04-02	7.04	7.04	0	7.66	7.66	0
2020-04-03	5.57	5.57	0	6.34	6.34	0
2020-04-04	1.84	1.84	0	2.29	2.29	0
2020-04-05	1.38	1.38	0	1.82	1.82	0
2020-04-06	2.26	2.26	0	2.87	2.87	0
2020-04-07	5.58	5.58	0	6.20	6.20	0
2020-04-08	5.72	5.72	0	6.03	6.03	0
2020-04-09	7.02	7.02	0	7.06	7.06	0
2020-04-10	10.90	10.90	0	10.76	10.76	0
2020-04-11	9.60	9.60	0	9.70	9.70	0
2020-04-12	10.91	10.91	0	10.65	10.65	0
2020-04-13	12.39	12.39	0	11.82	11.82	0
2020-04-14	12.29	12.29	0	11.73	11.73	0
2020-04-15	12.09	12.09	0	11.47	11.47	0
2020-04-16	13.12	13.12	0	12.27	12.27	0
2020-04-17	11.07	11.07	0	10.83	10.83	0
2020-04-18	8.33	8.33	0	8.73	8.73	0
2020-04-19	9.22	9.22	0	9.46	9.46	0
2020-04-20	8.76	8.76	0	9.03	9.03	0
2020-04-21	11.66	11.66	0	11.18	11.18	0
2020-04-22	14.39	14.39	0	13.81	13.81	0
2020-04-23	16.66	16.66	0	15.73	15.73	0
2020-04-24	17.77	17.77	0	16.84	16.84	0
2020-04-25	18.04	18.04	0	17.18	17.18	0
2020-04-26	16.05	16.05	0	15.01	15.01	0
2020-04-27	16.90	16.90	0	15.98	15.98	0
2020-04-28	17.96	17.96	0	17.04	17.04	0
2020-04-29	17.71	17.71	0	16.91	16.91	0
2020-04-30	16.71	16.71	0	15.91	15.91	0
2020-05-01	15.97	15.97	0	15.02	15.02	0
2020-05-02	12.78	12.78	0	12.53	12.53	0
2020-05-03	11.93	11.93	0	11.39	11.39	0
2020-05-04	12.94	12.94	0	12.06	12.06	0
2020-05-05	13.75	13.75	0	12.76	12.76	0
2020-05-06	15.09	15.09	0	13.97	13.97	0
2020-05-07	14.98	14.98	0	13.97	13.97	0
2020-05-08	15.88	15.88	0	14.48	14.48	0
2020-05-09	15.67	15.67	0	14.33	14.33	0
2020-05-10	13.97	13.97	0	13.00	13.00	0
2020-05-11	10.74	10.74	0	10.70	10.70	0
2020-05-12	15.48	15.48	0	14.39	14.39	0
2020-05-13	15.22	15.22	0	14.07	14.07	0
2020-05-14	11.50	11.50	0	11.50	11.50	0
2020-05-15	16.55	16.55	0	15.86	15.86	0
2020-05-16	16.34	16.34	0	15.64	15.64	0
2020-05-17	15.67	15.67	0	14.60	14.60	0
2020-05-18	10.25	10.25	0	10.25	10.25	0
2020-05-19	10.90	10.90	0	10.76	10.76	0
2020-05-20	12.38	12.38	0	11.95	11.95	0
2020-05-21	14.98	14.98	0	13.97	13.97	0
2020-05-22	15.08	15.08	0	14.40	14.40	0
2020-05-23	16.63	16.63	0	15.58	15.58	0
2020-05-24	16.94	16.94	0	15.74	15.74	0
2020-05-25	18.55	18.55	0	17.65	17.65	0
2020-05-26	19.56	19.56	0	19.06	19.06	0
2020-05-27	19.03	19.03	0	18.30	18.30	0
2020-05-28	18.20	18.20	0	17.06	17.06	0
2020-05-29	18.09	18.09	0	17.20	17.20	0
2020-05-30	16.86	16.86	0	16.36	16.36	0
2020-05-31	16.97	16.97	0	16.30	16.30	0
2020-06-01	18.08	18.08	0	17.25	17.25	0
2020-06-02	18.90	18.90	0	18.12	18.12	0
2020-06-03	19.04	19.04	0	18.25	18.25	0
2020-06-04	18.44	18.44	0	17.44	17.44	0
2020-06-05	17.00	17.00	0	16.18	16.18	0
2020-06-06	16.19	16.19	0	15.53	15.53	0
2020-06-07	17.44	17.44	0	16.44	16.44	0
2020-06-08	16.55	16.55	0	15.65	15.65	0
2020-06-09	17.94	17.94	0	17.03	17.03	0
2020-06-10	18.81	18.81	0	17.99	17.99	0
2020-06-11	18.08	18.08	0	17.08	17.08	0
2020-06-12	15.32	15.32	0	14.79	14.79	0
2020-06-13	15.76	15.76	0	15.16	15.16	0
2020-06-14	18.46	18.46	0	17.81	17.81	0
2020-06-15	18.69	18.69	0	18.05	18.05	0
2020-06-16	18.28	18.28	0	17.67	17.67	0
2020-06-17	18.53	18.53	0	17.80	17.80	0
2020-06-18	18.14	18.14	0	17.12	17.12	0
2020-06-19	17.83	17.83	0	16.69	16.69	0
2020-06-20	17.65	17.65	0	16.61	16.61	0
2020-06-21	18.22	18.22	0	17.25	17.25	0
2020-06-22	18.99	18.99	0	18.20	18.20	0
2020-06-23	19.29	19.29	0	18.64	18.64	0
2020-06-24	18.93	18.93	0	18.09	18.09	0
2020-06-25	18.45	18.45	0	17.50	17.50	0
2020-06-26	18.45	18.45	0	17.50	17.50	0
2020-06-27	18.45	18.45	0	17.50	17.50	0
2020-06-28	18.64	18.64	0	17.95	17.95	0
2020-06-29	18.84	18.84	0	18.17	18.17	0
2020-06-30	17.63	17.63	0	16.60	16.60	0
2020-07-01	16.96	16.96	0	15.76	15.76	0
2020-07-02	17.68	17.68	0	16.76	16.76	0
2020-07-03	17.85	17.85	0	16.78	16.78	0
2020-07-04	17.17	17.17	0	15.98	15.98	0
2020-07-05	17.77	17.77	0	16.64	16.64	0
2020-07-06	16.61	16.61	0	15.42	15.42	0
2020-07-07	17.73	17.73	0	16.89	16.89	0
2020-07-08	19.17	19.17	0	18.52	18.52	0
2020-07-09	18.79	18.79	0	17.91	17.91	0
2020-07-10	18.57	18.57	0	17.60	17.60	0
2020-07-11	18.62	18.63	-0.00999999999999801	17.60	17.60	0
2020-07-12	18.77	18.77	0	17.84	17.84	0
2020-07-13	18.29	18.29	0	17.36	17.36	0
2020-07-14	17.88	17.88	0	16.85	16.85	0
2020-07-15	18.58	18.58	0	17.67	17.67	0
2020-07-16	18.89	18.89	0	18.10	18.10	0
2020-07-17	18.61	18.61	0	17.75	17.75	0
2020-07-18	18.73	18.73	0	17.85	17.85	0
2020-07-19	18.76	18.76	0	17.88	17.88	0
2020-07-20	18.49	18.49	0	17.53	17.53	0
2020-07-21	18.35	18.35	0	17.42	17.42	0
2020-07-22	18.08	18.08	0	17.02	17.02	0
2020-07-23	17.71	17.71	0	16.60	16.60	0
2020-07-24	17.56	17.56	0	16.41	16.41	0
2020-07-25	17.88	17.88	0	16.80	16.80	0
2020-07-26	18.86	18.86	0	17.97	17.97	0
2020-07-27	18.77	18.77	0	17.84	17.84	0
2020-07-28	18.64	18.64	0	17.67	17.67	0
2020-07-29	18.61	18.61	0	17.69	17.69	0
2020-07-30	17.46	17.46	0	16.29	16.29	0
2020-07-31	16.56	16.56	0	15.13	15.13	0
2020-08-01	17.24	17.24	0	16.04	16.04	0
2020-08-02	18.44	18.44	0	17.44	17.44	0
2020-08-03	18.48	18.48	0	17.47	17.47	0
2020-08-04	18.19	18.19	0	17.16	17.16	0
2020-08-05	17.90	17.90	0	16.81	16.81	0
2020-08-06	17.86	17.86	0	16.90	16.90	0
2020-08-07	18.95	18.95	0	18.16	18.16	0
2020-08-08	19.03	19.03	0	18.28	18.28	0
2020-08-09	19.29	19.29	0	18.64	18.64	0
2020-08-10	19.21	19.21	0	18.51	18.51	0
2020-08-11	18.19	18.19	0	17.23	17.23	0
2020-08-12	18.27	18.27	0	17.23	17.23	0
2020-08-13	19.32	19.32	0	18.86	18.86	0
2020-08-14	19.97	19.97	0	19.90	19.90	0
2020-08-15	19.44	19.44	0	18.90	18.90	0
2020-08-16	18.49	18.49	0	17.53	17.53	0
2020-08-17	19.16	19.16	0	18.67	18.67	0
2020-08-18	20.00	20.00	0	20.00	20.00	0
2020-08-19	19.54	19.54	0	19.17	19.17	0
2020-08-20	18.14	18.14	0	17.37	17.37	0
2020-08-21	18.96	18.96	0	18.35	18.35	0
2020-08-22	19.36	19.36	0	18.82	18.82	0
2020-08-23	19.36	19.36	0	18.82	18.82	0
2020-08-24	18.98	18.98	0	18.31	18.31	0
2020-08-25	18.00	18.00	0	16.95	16.95	0
2020-08-26	17.47	17.47	0	16.28	16.28	0
2020-08-27	17.40	17.40	0	16.29	16.29	0
2020-08-28	18.52	18.52	0	17.62	17.62	0
2020-08-29	18.65	18.65	0	17.78	17.78	0
2020-08-30	18.39	18.39	0	17.50	17.50	0
2020-08-31	18.61	18.61	0	17.69	17.69	0
2020-09-01	18.48	18.48	0	17.58	17.58	0
2020-09-02	17.67	17.67	0	16.75	16.75	0
2020-09-03	17.78	17.78	0	16.65	16.65	0
2020-09-04	18.31	18.31	0	17.27	17.27	0
2020-09-05	19.21	19.21	0	18.62	18.62	0
2020-09-06	19.17	19.17	0	18.50	18.50	0
2020-09-07	17.94	17.94	0	16.90	16.90	0
2020-09-08	18.08	18.08	0	17.08	17.08	0
2020-09-09	17.07	17.07	0	16.10	16.10	0
2020-09-10	15.07	15.07	0	14.25	14.25	0
2020-09-11	16.52	16.52	0	15.50	15.50	0
2020-09-12	17.42	17.42	0	16.30	16.30	0
2020-09-13	17.10	17.10	0	16.05	16.05	0
2020-09-14	17.59	17.59	0	16.56	16.56	0
2020-09-15	16.59	16.59	0	15.41	15.41	0
2020-09-16	15.74	15.74	0	14.44	14.44	0
2020-09-17	17.12	17.12	0	16.01	16.01	0
2020-09-18	17.47	17.47	0	16.66	16.66	0
2020-09-19	16.90	16.90	0	15.91	15.91	0
2020-09-20	16.62	16.62	0	15.43	15.43	0
2020-09-21	17.39	17.39	0	16.35	16.35	0
2020-09-22	17.56	17.56	0	16.54	16.54	0
2020-09-23	17.94	17.94	0	17.03	17.03	0
2020-09-24	17.52	17.52	0	16.59	16.59	0
2020-09-25	16.41	16.41	0	15.41	15.41	0
2020-09-26	18.88	18.88	0	18.37	18.37	0
2020-09-27	19.99	19.99	0	19.96	19.96	0
2020-09-28	18.65	18.65	0	17.98	17.98	0
2020-09-29	17.27	17.27	0	16.06	16.06	0
2020-09-30	18.47	18.47	0	17.47	17.47	0
2020-10-01	18.31	18.31	0	17.39	17.39	0
2020-10-02	17.11	17.11	0	16.00	16.00	0
2020-10-03	16.19	16.19	0	15.11	15.11	0
2020-10-04	14.97	14.97	0	13.96	13.96	0
2020-10-05	15.60	15.60	0	14.21	14.21	0
2020-10-06	15.70	15.70	0	14.29	14.29	0
2020-10-07	15.31	15.31	0	14.06	14.06	0
2020-10-08	13.99	13.99	0	13.28	13.28	0
2020-10-09	15.73	15.73	0	14.71	14.71	0
2020-10-10	14.64	14.64	0	14.10	14.10	0
2020-10-11	15.17	15.17	0	14.17	14.17	0
2020-10-12	14.60	14.60	0	13.37	13.37	0
2020-10-13	16.04	16.04	0	14.83	14.83	0
2020-10-14	18.74	18.74	0	18.06	18.06	0
2020-10-15	18.82	18.82	0	18.17	18.17	0
2020-10-16	17.17	17.17	0	15.98	15.98	0
2020-10-17	16.04	16.04	0	14.67	14.67	0
2020-10-18	15.67	15.67	0	14.33	14.33	0
2020-10-19	15.62	15.62	0	14.36	14.36	0
2020-10-20	15.92	15.92	0	14.64	14.64	0
2020-10-21	15.24	15.24	0	13.98	13.98	0
2020-10-22	11.33	11.33	0	10.96	10.96	0
2020-10-23	10.68	10.68	0	10.46	10.46	0
2020-10-24	10.71	10.71	0	10.51	10.51	0
2020-10-25	10.55	10.55	0	10.63	10.63	0
2020-10-26	10.96	10.96	0	11.03	11.03	0
2020-10-27	9.43	9.43	0	9.62	9.62	0
2020-10-28	8.21	8.21	0	8.79	8.79	0
2020-10-29	9.76	9.76	0	9.84	9.84	0
2020-10-30	9.87	9.87	0	9.91	9.91	0
2020-10-31	10.13	10.13	0	10.09	10.09	0
2020-11-01	10.46	10.46	0	10.32	10.32	0
2020-11-02	11.53	11.53	0	11.03	11.03	0
2020-11-03	10.01	10.01	0	10.01	10.01	0
2020-11-04	10.71	10.71	0	10.48	10.48	0
2020-11-05	12.04	12.04	0	11.41	11.41	0
2020-11-06	9.18	9.18	0	9.38	9.38	0
2020-11-07	9.18	9.18	0	9.38	9.38	0
2020-11-08	2.68	2.68	0	3.15	3.15	0
2020-11-09	1.25	1.25	0	1.96	1.96	0
2020-11-10	3.59	3.59	0	4.36	4.36	0
2020-11-11	5.19	5.19	0	6.06	6.06	0
2020-11-12	3.36	3.36	0	4.19	4.19	0
2020-11-13	1.49	1.49	0	2.03	2.03	0
2020-11-14	2.47	2.47	0	3.30	3.30	0
2020-11-15	5.65	5.65	0	6.69	6.69	0
2020-11-16	5.94	5.94	0	6.75	6.75	0
2020-11-17	4.67	4.67	0	5.28	5.28	0
2020-11-18	5.00	5.00	0	5.66	5.66	0
2020-11-19	3.58	3.58	0	4.37	4.37	0
2020-11-20	4.80	4.80	0	5.66	5.66	0
2020-11-21	3.33	3.33	0	4.19	4.19	0
2020-11-22	3.59	3.59	0	4.66	4.66	0
2020-11-23	4.50	4.50	0	5.45	5.45	0
2020-11-24	4.51	4.51	0	5.31	5.31	0
2020-11-25	5.42	5.42	0	5.78	5.78	0
2020-11-26	4.96	4.96	0	5.45	5.45	0
2020-11-27	2.38	2.38	0	3.35	3.35	0
2020-11-28	2.80	2.80	0	3.93	3.93	0
2020-11-29	2.84	2.84	0	3.96	3.96	0
2020-11-30	4.53	4.53	0	5.61	5.61	0
2020-12-01	2.38	2.38	0	3.22	3.22	0
2020-12-02	5.38	5.38	0	6.50	6.50	0
2020-12-03	2.12	2.12	0	2.89	2.89	0
2020-12-04	4.88	4.88	0	6.14	6.14	0
2020-12-05	2.60	2.60	0	3.52	3.52	0
2020-12-06	8.41	8.41	0	8.91	8.91	0
2020-12-07	10.52	10.52	0	10.93	10.93	0
2020-12-08	5.96	5.96	0	6.90	6.90	0
2020-12-09	2.79	2.79	0	3.39	3.39	0
2020-12-10	6.48	6.48	0	7.27	7.27	0
2020-12-11	0.84	0.84	0	1.27	1.27	0
2020-12-12	1.58	1.58	0	2.10	2.10	0
2020-12-13	0.56	0.56	0	0.92	0.92	0
2020-12-14	1.49	1.49	0	2.16	2.16	0
2020-12-15	0.95	0.95	0	1.48	1.48	0
2020-12-16	0.83	0.83	0	1.26	1.26	0
2020-12-17	2.07	2.07	0	2.73	2.73	0
2020-12-18	0.81	0.81	0	1.36	1.36	0
2020-12-19	1.35	1.35	0	2.05	2.05	0
2020-12-20	0.24	0.24	0	0.52	0.52	0
2020-12-21	0.00	0.00	0	0.00	0.00	0
2020-12-22	2.03	2.03	0	2.83	2.83	0
2020-12-23	0.53	0.53	0	1.00	1.00	0
2020-12-24	0.61	0.61	0	1.07	1.07	0
2020-12-25	0.60	0.60	0	0.96	0.96	0
2020-12-26	2.89	2.89	0	3.60	3.60	0
2020-12-27	0.47	0.47	0	0.85	0.85	0
2020-12-28	0.50	0.50	0	0.87	0.87	0
2020-12-29	0.50	0.50	0	0.87	0.87	0
2020-12-30	0.50	0.50	0	0.87	0.87	0
2020-12-31	0.74	0.74	0	1.19	1.19	0

Conclusion

The estimated degree day values computed by degday match the values from the UC IPM website.