| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°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. 21 - Sep. 30 | |
| 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 59330 - Glendive, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 3 | 11 | 20 | 32 | 44 | 53 | 58 | 56 | 44 | 33 | 20 | 8 | 32 |
| Avg Max Temp (°F) | 25 | 33 | 45 | 59 | 70 | 80 | 87 | 87 | 74 | 61 | 41 | 29 | 58 |
| Avg Precip (In.) | .41 | .33 | .57 | 1.17 | 2.08 | 2.51 | 1.81 | 1.43 | 1.42 | 1 | .49 | .4 | 13.62 |