| 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 6a: -10°F to -5°F Zone 4a: -30°F to -25°F | |
| 2012 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 | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Aug. 21 - Aug. 31 | |
| Average Last Frost Date: | Jun. 11 - Jun. 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 59858 - Philipsburg, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 22 | 27 | 33 | 39 | 43 | 42 | 36 | 28 | 20 | 14 | 28 |
| Avg Max Temp (°F) | 32 | 36 | 43 | 51 | 59 | 67 | 75 | 76 | 66 | 54 | 38 | 31 | 52 |
| Avg Precip (In.) | .58 | .56 | .85 | 1.37 | 2.47 | 2.16 | 1.36 | 1.6 | 1.45 | 1.04 | .74 | .6 | 14.77 |