| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F 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: | Aug. 1 - Aug. 10 | |
| Average Last Frost Date: | Jun. 21 - Jun. 30 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 17ak - Deer Lodge-Philipsburg-Avon Grassy Intermontane Hills and Valleys | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 59711 - Anaconda, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 18 | 21 | 28 | 36 | 43 | 49 | 48 | 39 | 32 | 21 | 15 | 30 |
| Avg Max Temp (°F) | 30 | 36 | 42 | 50 | 59 | 68 | 76 | 76 | 66 | 54 | 39 | 32 | 52 |
| Avg Precip (In.) | .71 | .56 | .83 | 1 | 1.86 | 1.97 | 1.37 | 1.39 | 1.18 | .7 | .7 | .77 | 13.02 |