| Month | High (°F) | Low (°F) | Precipitation (in) |
|---|---|---|---|
| January | 30.7 | 11.4 | 1.2 |
| February | 34.0 | 13.1 | 1.0 |
| March | 43.9 | 21.0 | 1.3 |
| April | 53.3 | 29.0 | 1.8 |
| May | 63.1 | 37.8 | 2.6 |
| June | 71.7 | 45.8 | 2.9 |
| July | 81.7 | 51.6 | 1.5 |
| August | 80.9 | 49.9 | 1.2 |
| September | 69.9 | 41.5 | 1.4 |
| October | 54.8 | 30.8 | 1.5 |
| November | 40.6 | 20.6 | 1.3 |
| December | 31.4 | 12.8 | 1.2 |
| Entire Year | 54.7 | 30.4 | 18.9 |
| City | Average (°F) | Record (°F) | Yearly (inches) | |||
|---|---|---|---|---|---|---|
| High | Low | High | Low | Precipitation | Snow | |
| Anaconda | 57.2 | 29.7 | 102 | -38 | 14.8 | 75.9 |
| Billings | 59.5 | 37.1 | 112 | -49 | 14.3 | 57.4 |
| Bozeman | 57.5 | 32.2 | 105 | -43 | 19.8 | 92.6 |
| Butte | 54.2 | 26.3 | 100 | -52 | 12.7 | n/a |
| Conrad | 56.7 | 30.2 | 105 | -46 | 12.0 | 47.2 |
| Cut Bank | 54.2 | 29.9 | 107 | -47 | 10.7 | n/a |
| Dillon | 56.3 | 30.4 | 102 | -40 | 9.4 | n/a |
| Glasgow | 55.2 | 31.5 | 113 | -59 | 13.4 | 39.9 |
| Glendive | 59.0 | 33.7 | 117 | -50 | 14.8 | 25.0 |
| Great Falls | 57.3 | 32.6 | 107 | -49 | 14.8 | 66.3 |
| Hamilton | 59.6 | 33.3 | 105 | -39 | 13.2 | n/a |
| Hardin | 63.5 | 33.7 | 112 | -47 | 12.8 | 28.0 |
| Havre | 56.8 | 30.3 | 111 | -57 | 11.7 | 41.6 |
| Helena | 57.9 | 33.1 | 105 | -42 | 11.3 | 37.1 |
| Kalispell | 55.5 | 31.6 | 105 | -38 | 16.8 | 57.9 |
| Livingston | 59.1 | 33.1 | 106 | -45 | 14.4 | n/a |
| Miles City | 59.1 | 34.5 | 111 | -49 | 12.9 | n/a |
| Missoula | 57.6 | 33.8 | 107 | -33 | 14.1 | 42.8 |
| Opheim | 50.5 | 25.2 | 105 | -49 | 11.9 | 36.4 |
| Red Lodge | 55.1 | 31.0 | 101 | -42 | 23.2 | 143.6 |
| West Glacier | 54.1 | 32.8 | 100 | -36 | 30.3 | 118.1 |
| West Yellowstone | 53.2 | 22.4 | 97 | -66 | 24.1 | n/a |