| 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 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F | |
| Average First Frost Date: | Sep.1 - Sep. 10 | |
| Average Last Frost Date: | Jul. 1 - Jul. 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 59834 - Frenchtown, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 17 | 20 | 26 | 32 | 38 | 45 | 49 | 48 | 40 | 32 | 24 | 17 | 32 |
| Avg Max Temp (°F) | 32 | 39 | 49 | 58 | 67 | 74 | 83 | 83 | 72 | 58 | 41 | 32 | 57 |
| Avg Precip (In.) | 1.08 | .89 | .94 | 1.06 | 1.93 | 1.36 | 1.08 | 1.29 | .94 | .56 | 1.06 | 1.17 | 13.34 |