YEAR 2026 - 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 |
26 |
19 |
0 |
0 |
0 |
| 2 |
24 |
20 |
0 |
0 |
0 |
| 3 |
31 |
24 |
0 |
0 |
0 |
| 4 |
40 |
27 |
0 |
0 |
4.0 |
| 5 |
44 |
33 |
0 |
2.0 |
6.5 |
| 6 |
40 |
33 |
0 |
0 |
4.5 |
| 7 |
38 |
32 |
0 |
0 |
3.0 |
| 8 |
38 |
27 |
0 |
0 |
3.0 |
| 9 |
37 |
22 |
0 |
0 |
2.5 |
| 10 |
36 |
24 |
0 |
0 |
2.0 |
| 11 |
37 |
24 |
0 |
0 |
2.5 |
| 12 |
44 |
27 |
0 |
2.0 |
6.0 |
| 13 |
48 |
42 |
0 |
5.0 |
13.0 |
| 14 |
49 |
26 |
0 |
4.5 |
8.5 |
| 15 |
33 |
25 |
0 |
0 |
0.5 |
| 16 |
31 |
18 |
0 |
0 |
0 |
| 17 |
35 |
16 |
0 |
0 |
1.5 |
| 18 |
32 |
17 |
0 |
0 |
0 |
| 19 |
26 |
23 |
0 |
0 |
0 |
| 20 |
27 |
23 |
0 |
0 |
0 |
| 21 |
29 |
23 |
0 |
0 |
0 |
| 22 |
28 |
25 |
0 |
0 |
0 |
| 23 |
29 |
9 |
0 |
0 |
0 |
| 24 |
26 |
7 |
0 |
0 |
0 |
| 25 |
19 |
7 |
0 |
0 |
0 |
| 26 |
22 |
5 |
0 |
0 |
0 |
| 27 |
25 |
10 |
0 |
0 |
0 |
| 28 |
39 |
20 |
0 |
0 |
3.5 |
| 29 |
31 |
21 |
0 |
0 |
0 |
| 30 |
37 |
31 |
0 |
0 |
2.5 |
| 31 |
42 |
32 |
0 |
1.0 |
5.0 |
| |
|
|
|
|
|
| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
33.6 |
22.3 |
0 |
14.5 |
68.5 |
February
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
|
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
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|
|
March
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| |
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| |
AV MAX |
AVMIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
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|
April
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
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|
|
May
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
|
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|
|
June
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
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|
|
|
|
July
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
|
|
|
|
August
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
|
|
|
|
September
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
|
|
|
|
|
October
| Temperatures |
Growing Degree Days |
| Day |
MAX |
MIN |
Base 50 |
Base 40 |
Base 32 |
| 1 |
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| 2 |
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| 3 |
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| 4 |
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| 5 |
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| 6 |
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| 7 |
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| 8 |
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| 9 |
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| 10 |
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| 11 |
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| 12 |
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| 13 |
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| 14 |
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| 15 |
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| 16 |
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| 17 |
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| 18 |
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| 19 |
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| 20 |
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| 21 |
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| 22 |
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| 23 |
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| 24 |
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| 25 |
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| 26 |
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| 27 |
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| 28 |
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| 29 |
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| 30 |
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| 31 |
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| |
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| |
AV MAX |
AV MIN |
Total Base 50 |
Total Base 40 |
Total Base 32 |
| |
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|
Northwestern Ag Research Center
4570 Montana Hwy 35
Kalispell, MT 59901
Office Tel: (406) 994-4312
Hours: 7:00 A.M-4:00 P.M. M-F
Superintendent
Jessica A. Torrion (JT)
JT's direct line 406-994-4304
jessica.torrion@montana.edu
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