| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 42i - Glaciated Dark Brown Prairie | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 59254 - Plentywood, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -2 | 7 | 17 | 29 | 41 | 50 | 54 | 52 | 41 | 31 | 16 | 3 | 28 |
| Avg Max Temp (°F) | 20 | 28 | 41 | 57 | 70 | 78 | 84 | 84 | 72 | 58 | 37 | 24 | 54 |
| Avg Precip (In.) | .33 | .3 | .6 | .83 | 1.9 | 2.73 | 2.26 | 1.38 | 1.37 | .73 | .4 | .37 | 13.2 |