| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| 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: | 8 - 14 days Over 86°F |
Annual Climate Data for ZIP Code 59865 - Saint Ignatius, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 18 | 22 | 27 | 33 | 40 | 47 | 50 | 50 | 42 | 33 | 26 | 19 | 34 |
| Avg Max Temp (°F) | 33 | 39 | 49 | 59 | 67 | 75 | 83 | 83 | 71 | 58 | 41 | 33 | 58 |
| Avg Precip (In.) | 1.01 | .8 | 1.15 | 1.43 | 2.58 | 2.34 | 1.4 | 1.3 | 1.39 | 1.18 | 1.06 | 1.09 | 16.74 |