| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 17s - Bitterroot-Frenchtown Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 59808 - Missoula, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 18 | 25 | 31 | 38 | 44 | 49 | 48 | 40 | 31 | 23 | 16 | 31 |
| Avg Max Temp (°F) | 30 | 36 | 45 | 54 | 63 | 71 | 80 | 80 | 69 | 55 | 38 | 30 | 54 |
| Avg Precip (In.) | 2.54 | 1.79 | 1.73 | 1.67 | 2.27 | 2.18 | 1.35 | 1.33 | 1.55 | 1.66 | 2.37 | 2.74 | 23.19 |