| 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 4a: -30F to -25F | |
| Average First Frost Date: | Aug. 21 - Aug. 31 | |
| Average Last Frost Date: | May 11 - May 20 | |
| 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 59722 - Deer Lodge, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 15 | 21 | 26 | 33 | 40 | 43 | 42 | 34 | 26 | 18 | 10 | 27 |
| Avg Max Temp (°F) | 33 | 39 | 48 | 58 | 65 | 73 | 81 | 81 | 71 | 59 | 43 | 33 | 57 |
| Avg Precip (In.) | .37 | .3 | .49 | .67 | 1.8 | 1.49 | 1.36 | 1.3 | 1.06 | .57 | .42 | .41 | 10.25 |