2019 - Northwestern Agricultural Research Center | Montana State University

YEAR 2020 - GROWING DEGREE DAYS JANUARY THROUGH OCTOBER

CALCULATED AT BASE 50, BASE 40, AND BASE 32

January

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	23	6	0.0	0.0	0.0
2	24	16	0.0	0.0	0.0
3	38	22	0.0	0.0	3.0
4	42	37	0.0	1.0	7.5
5	40	25	0.0	0.0	4.0
6	41	29	0.0	0.5	4.5
7	31	28	0.0	0.0	0.0
8	34	11	0.0	0.0	1.0
9	30	10	0.0	0.0	0.0
10	31	28	0.0	0.0	0.0
11	38	27	0.0	0.0	3.0
12	31	25	0.0	0.0	0.0
13	31	21	0.0	0.0	0.0
14	26	20	0.0	0.0	0.0
15	22	17	0.0	0.0	0.0
16	19	16	0.0	0.0	0.0
17	28	17	0.0	0.0	0.0
18	28	22	0.0	0.0	0.0
19	34	22	0.0	0.0	1.0
20	38	20	0.0	0.0	3.0
21	31	19	0.0	0.0	0.0
22	32	16	0.0	0.0	0.0
23	31	28	0.0	0.0	0.0
24	34	22	0.0	0.0	1.0
25	32	22	0.0	0.0	0.0
26	33	26	0.0	0.0	0.5
27	42	22	0.0	1.0	5.0
28	41	12	0.0	0.5	4.5
29	34	2	0.0	0.0	1.0
30	26	1	0.0	0.0	0.0
31	21	12	0.0	0.0	0.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	31.8	19.4	0.0	3.0	39.0

February

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	29	16	0.0	0.0	0.0
2	43	16	0.0	1.5	5.5
3	45	13	0.0	2.5	6.5
4	13	-1	0.0	0.0	0.0
5	11	-2	0.0	0.0	0.0
6	12	1	0.0	0.0	0.0
7	15	-11	0.0	0.0	0.0
8	17	2	0.0	0.0	0.0
9	21	1	0.0	0.0	0.0
10	5	-20	0.0	0.0	0.0
11	3	-17	0.0	0.0	0.0
12	15	3	0.0	0.0	0.0
13	36	15	0.0	0.0	2.0
14	30	15	0.0	0.0	0.0
15	28	14	0.0	0.0	0.0
16	32	23	0.0	0.0	0.0
17	33	12	0.0	0.0	0.5
18	20	-8	0.0	0.0	0.0
19	14	-12	0.0	0.0	0.0
20	20	3	0.0	0.0	0.0
21	26	-4	0.0	0.0	0.0
22	26	-6	0.0	0.0	0.0
23	27	2	0.0	0.0	0.0
24	24	-8	0.0	0.0	0.0
25	15	-4	0.0	0.0	0.0
26	11	1	0.0	0.0	0.0
27	14	-9	0.0	0.0	0.0
28	15	0	0.0	0.0	0.0
29	0	0	0.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	21.4	1.3	0.0	4.0	14.5

March

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	21	15	0.0	0.0	0.0
2	25	-5	0.0	0.0	0.0
3	14	-22	0.0	0.0	0.0
4	15	-22	0.0	0.0	0.0
5	14	-16	0.0	0.0	0.0
6	16	-8	0.0	0.0	0.0
7	31	13	0.0	0.0	0.0
8	35	15	0.0	0.0	1.5
9	35	13	0.0	0.0	1.5
10	32	-3	0.0	0.0	0.0
11	30	2	0.0	0.0	0.0
12	32	6	0.0	0.0	0.0
13	37	23	0.0	0.0	2.5
14	37	26	0.0	0.0	2.5
15	37	22	0.0	0.0	2.5
16	40	19	0.0	0.0	4.0
17	41	16	0.0	0.5	4.5
18	42	17	0.0	1.0	5.0
19	40	18	0.0	0.0	4.0
20	43	19	0.0	1.5	5.5
21	44	18	0.0	2.0	6.0
22	45	20	0.0	2.5	6.5
23	47	26	0.0	3.5	7.5
24	49	30	0.0	4.5	8.5
25	53	34	1.5	6.5	11.5
26	53	30	1.5	6.5	10.5
27	44	21	0.0	2.0	6.0
28	50	23	0.0	5.0	9.0
29	48	27	0.0	4.0	8.0
30	49	26	0.0	4.5	8.5
31	46	31	0.0	3.0	7.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	36.9	14.0	3.0	47.0	122.5

April

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	51	33	0.5	5.5	10.0
2	51	23	0.5	5.5	9.5
3	56	26	3.0	8.0	12.0
4	44	30	0.0	2.0	6.0
5	56	40	3.0	8.0	16.0
6	54	36	2.0	7.0	13.0
7	51	33	0.5	5.5	10.0
8	51	32	0.5	5.5	9.5
9	50	37	0.0	5.0	11.5
10	43	34	0.0	1.5	6.5
11	45	35	0.0	2.5	8.0
12	47	29	0.0	3.5	7.5
13	50	31	0.0	5.0	9.0
14	46	32	0.0	3.0	7.0
15	47	34	0.0	3.5	8.5
16	45	28	0.0	2.5	6.5
17	52	30	1.0	6.0	10.0
18	56	40	3.0	8.0	16.0
19	55	44	2.5	9.5	17.5
20	65	33	7.5	12.5	17.0
21	53	31	1.5	6.5	10.5
22	61	43	5.5	12.0	20.0
23	65	45	7.5	15.0	23.0
24	64	44	7.0	14.0	22.0
25	65	30	7.5	12.5	16.5
26	63	37	6.5	11.5	18.0
27	53	30	1.5	6.5	10.5
28	49	19	0.0	4.5	8.5
29	42	29	0.0	1.0	5.0
30	51	22	0.5	5.5	9.5

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	52.7	33.0	61.5	198.5	354.5

May

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	52	28	1.0	6.0	10.0
2	53	33	1.5	6.5	11.0
3	53	33	1.5	6.5	11.0
4	51	36	0.5	5.5	11.5
5	65	37	7.5	12.5	19.0
6	63	38	6.5	11.5	18.5
7	63	39	6.5	11.5	19.0
8	68	31	9.0	14.0	18.0
9	65	36	7.5	12.5	18.5
10	64	39	7.0	12.0	19.5
11	70	38	10.0	15.0	22.0
12	78	43	14.0	20.5	28.5
13	80	53	16.5	26.5	34.5
14	79	50	14.5	24.5	32.5
15	78	48	14.0	23.0	31.0
16	68	50	9.0	19.0	27.0
17	68	46	9.0	17.0	25.0
18	51	42	0.5	6.5	14.5
19	51	40	0.5	5.5	13.5
20	53	40	1.5	6.5	14.5
21	62	46	6.0	14.0	22.0
22	62	33	6.0	11.0	15.5
23	74	40	12.0	17.0	25.0
24	68	47	9.0	17.5	25.5
25	66	48	8.0	17.0	25.0
26	60	48	5.0	14.0	22.0
27	68	40	9.0	14.0	22.0
28	73	41	11.5	17.0	25.0
29	74	39	12.0	17.0	24.5
30	77	47	13.5	22.0	30.0
31	78	52	15.0	25.0	33.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	65.6	41.3	245.0	448.0	668.5

June

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	73	48	11.5	20.5	28.5
2	76	48	13.0	22.0	30.0
3	81	52	16.5	26.5	34.5
4	81	45	15.5	23.0	31.0
5	77	45	13.5	21.0	29.0
6	77	51	14.0	24.0	32.0
7	55	44	2.5	9.5	17.5
8	58	43	4.0	10.5	18.5
9	50	45	0.0	7.5	15.5
10	68	46	9.0	17.0	25.0
11	70	44	10.0	17.0	25.0
12	74	46	12.0	20.0	28.0
13	80	52	16.0	26.0	34.0
14	82	56	19.0	29.0	37.0
15	82	49	16.0	25.5	33.5
16	76	48	13.0	22.0	30.0
17	79	50	14.5	24.5	32.5
18	76	52	14.0	24.0	32.0
19	79	58	18.5	28.5	36.5
20	68	43	9.0	15.5	23.5
21	52	41	1.0	6.5	14.5
22	57	46	3.5	11.5	19.5
23	64	47	7.0	15.5	23.5
24	65	49	7.5	17.0	25.0
25	70	43	10.0	16.5	24.5
26	79	47	14.5	23.0	31.0
27	70	43	10.0	16.5	24.5
28	69	53	11.0	21.0	29.0
29	75	41	12.5	18.0	26.0
30	80	45	15.0	22.5	30.5

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	71.4	47.3	333.5	581.5	821.5

July

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	81	50	15.5	25.5	33.5
2	71	56	13.5	23.5	31.5
3	74	47	12.0	20.5	28.5
4	74	45	12.0	19.5	27.5
5	71	51	11.0	21.0	29.0
6	79	55	17.0	27.0	35.0
7	83	45	16.5	24.0	32.0
8	74	46	12.0	20.0	28.0
9	75	51	13.0	23.0	31.0
10	76	53	14.5	24.5	32.5
11	81	61	21.0	31.0	39.0
12	78	52	15.0	25.0	33.0
13	84	54	19.0	29.0	37.0
14	84	46	17.0	25.0	33.0
15	82	47	16.0	24.5	32.5
16	80	56	18.0	28.0	36.0
17	72	51	11.5	21.5	29.5
18	70	41	10.0	15.5	23.5
19	73	37	11.5	16.5	23.0
20	71	38	10.5	15.5	22.5
21	69	40	9.5	14.5	22.5
22	83	46	16.5	24.5	32.5
23	78	54	16.0	26.0	34.0
24	92	55	20.5	30.5	38.5
25	74	43	12.0	18.5	26.5
26	80	45	15.0	22.5	30.5
27	86	49	18.0	27.5	35.5
28	84	46	17.0	25.0	33.0
29	81	45	15.5	23.0	31.0
30	85	46	17.5	25.5	33.5
31	86	47	18.0	26.5	34.5

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	78.4	48	444.0	697.5	935.0

August

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	90	50	20.0	28.0	36.0
2	90	50	20.0	28.0	36.0
3	91	44	20.5	25.0	33.0
4	86	48	18.0	27.0	35.0
5	86	46	18.0	26.0	34.0
6	89	48	19.5	27.0	35.0
7	91	51	21.0	28.5	36.5
8	92	51	21.5	28.5	36.5
9	91	56	23.5	31.0	39.0
10	72	48	11.0	20.0	28.0
11	83	51	17.0	27.0	35.0
12	69	56	12.5	22.5	30.5
13	66	43	8.0	14.5	22.5
14	79	45	14.5	22.0	30.0
15	79	45	14.5	22.0	30.0
16	80	53	16.5	26.5	34.5
17	76	48	13.0	22.0	30.0
18	68	48	9.0	18.0	26.0
19	81	48	15.5	24.5	32.5
20	87	46	18.5	26.0	34.0
21	88	49	19.0	27.5	35.5
22	93	54	23.5	30.0	38.0
23	72	49	11.0	20.5	28.5
24	78	54	16.0	26.0	34.0
25	80	40	15.0	20.0	28.0
26	72	39	11.0	16.0	23.5
27	75	37	12.5	17.5	24.0
28	78	40	14.0	19.0	27.0
29	87	48	18.5	27.0	35.0
30	77	51	14.0	24.0	32.0
31	80	51	15.5	25.5	33.5

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	81.5	48.0	486.5	721.5	959.5

September

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	82	50	16.0	26.0	34.0
2	87	42	18.0	24.0	32.0
3	85	42	17.5	23.5	31.5
4	84	52	18.0	28.0	36.0
5	85	40	17.5	22.5	30.5
6	88	57	21.5	31.5	39.5
7	66	50	8.0	18.0	26.0
8	76	50	13.0	23.0	31.0
9	76	52	14.0	24.0	32.0
10	59	49	4.5	14.0	22.0
11	65	48	7.5	16.5	24.5
12	69	43	9.5	16.0	24.0
13	71	42	10.5	16.5	24.5
14	69	42	9.5	15.5	23.5
15	71	42	10.5	16.5	24.5
16	81	44	15.5	22.5	30.5
17	72	45	11.0	18.5	26.5
18	60	43	5.0	11.5	19.5
19	56	46	3.0	11.0	19.0
20	61	44	5.5	12.5	20.5
21	59	51	5.0	15.0	23.0
22	62	51	6.5	16.5	24.5
23	72	53	12.5	22.5	30.5
24	67	40	8.5	13.5	21.5
25	65	38	7.5	12.5	19.5
26	55	53	4.0	14.0	22.0
27	59	32	4.5	9.5	13.5
28	54	33	2.0	7.0	11.5
29	42	32	0.0	1.0	5.0
30	38	24	0.0	0.0	3.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	67.9	44.3	286.0	503.0	725.5

October

Temperatures			Growing Degree Days
Day	MAX	MIN	Base 50	Base 40	Base 32
1	46	23	0.0	3.0	7.0
2	49	23	0.0	4.5	8.5
3	52	23	1.0	6.0	10.0
4	56	29	3.0	8.0	12.0
5	54	40	2.0	7.0	15.0
6	53	37	1.5	6.5	13.0
7	58	35	4.0	9.0	14.5
8	63	40	6.5	11.5	19.5
9	54	28	2.0	7.0	11.0
10	38	14	0.0	0.0	3.0
11	41	15	0.0	0.5	4.5
12	46	17	0.0	3.0	7.0
13	51	24	0.5	5.5	9.5
14	51	26	0.5	5.5	9.5
15	54	23	2.0	7.0	11.0
16	54	24	2.0	7.0	11.0
17	66	37	8.0	13.0	19.5
18	50	39	0.0	5.0	12.5
19	49	36	0.0	4.5	10.5
20	47	34	0.0	3.5	8.5
21	44	36	0.0	2.0	8.0
22	45	38	0.0	2.5	9.5
23	60	30	5.0	10.0	14.0
24	51	29	0.5	5.5	9.5
25	48	36	0.0	4.0	10.0
26	69	24	9.5	14.5	18.5
27	43	22	0.0	1.5	5.5
28	36	25	0.0	0.0	2.0
29	30	0	0.0	0.0	0.0
30	21	-1	0.0	0.0	0.0
31	27	5	0.0	0.0	0.0

	AV MAX	AV MIN	Total Base 50	Total Base 40	Total Base 32
	48.6	26.2	48.0	157.0	294.0