| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F 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 4b: -25°F to -20°F Zone 5a: -20°F to -15°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Aug. 21 - Aug. 31 | |
| Average Last Frost Date: | Jun. 21 - Jun. 30 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 17aa - Dry Intermontane Sagebrush Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 59701 - Butte, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 13 | 20 | 27 | 35 | 42 | 47 | 46 | 37 | 28 | 17 | 10 | 28 |
| Avg Max Temp (°F) | 30 | 35 | 42 | 51 | 60 | 69 | 78 | 78 | 67 | 54 | 38 | 31 | 53 |
| Avg Precip (In.) | .54 | .55 | .97 | 1.14 | 2.01 | 1.98 | 1.41 | 1.32 | 1.06 | .77 | .58 | .57 | 12.91 |