| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 43c - River Breaks | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 46 - 60 days Over 86°F |
Annual Climate Data for ZIP Code 59301 - Miles City, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 14 | 23 | 34 | 44 | 53 | 58 | 57 | 45 | 34 | 21 | 10 | 33 |
| Avg Max Temp (°F) | 28 | 37 | 48 | 61 | 71 | 81 | 89 | 88 | 76 | 62 | 43 | 32 | 60 |
| Avg Precip (In.) | .5 | .35 | .6 | 1.39 | 2.2 | 2.44 | 1.63 | 1.14 | 1.19 | 1.14 | .54 | .45 | 13.58 |