| 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 1b: -15F to -10F | |
| 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: | 15l - Salish Mountains | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 59925 - Marion, MT | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 15 | 20 | 27 | 34 | 39 | 44 | 43 | 34 | 26 | 20 | 13 | 27 |
| Avg Max Temp (°F) | 31 | 34 | 40 | 54 | 64 | 71 | 80 | 80 | 69 | 53 | 37 | 29 | 53 |
| Avg Precip (In.) | 1.91 | 1.69 | 1.72 | 1.97 | 2.49 | 2.25 | 1.76 | 1.14 | 1.51 | 1.19 | 2.46 | 2.06 | 22.15 |