| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°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: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 15c - Flathead Valley | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 59864 - Ronan, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 27 | 33 | 40 | 47 | 51 | 50 | 42 | 34 | 26 | 20 | 34 |
| Avg Max Temp (°F) | 32 | 38 | 47 | 57 | 66 | 73 | 81 | 81 | 70 | 57 | 41 | 33 | 56 |
| Avg Precip (In.) | 1.35 | 1.02 | 1.17 | 1.4 | 2.5 | 2.53 | 1.42 | 1.43 | 1.53 | 1.3 | 1.42 | 1.47 | 18.54 |