| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | BSk - Cold Semi-Arid Climate | |
| Ecoregion: | 43n - Central Grassland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 31 - 45 days Over 86°F |
Annual Climate Data for ZIP Code 59087 - Winnett, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 8 | 14 | 22 | 31 | 40 | 48 | 53 | 51 | 42 | 32 | 20 | 11 | 31 |
| Avg Max Temp (°F) | 33 | 40 | 49 | 59 | 69 | 78 | 86 | 86 | 74 | 62 | 45 | 36 | 60 |
| Avg Precip (In.) | .55 | .34 | .75 | 1.24 | 2.64 | 2.3 | 1.53 | 1.26 | 1.03 | .88 | .48 | .49 | 13.48 |