Kalispell, Montana has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 0.3 °C (low) to 13.1 °C (high). Annual precipitation averages 397.8 Millimeters. Kalispell is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 21 - May 31 through the first frost around Sep.11 - Sep. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.8 °C | -0.1 °C | 30.73 mm |
| February | -7.3 °C | 2.2 °C | 21.59 mm |
| March | -3.9 °C | 7.1 °C | 26.42 mm |
| April | -0.4 °C | 12.8 °C | 32.26 mm |
| May | 3.9 °C | 18.4 °C | 44.96 mm |
| June | 7.4 °C | 21.8 °C | 63.75 mm |
| July | 9.7 °C | 27.9 °C | 28.96 mm |
| August | 8.7 °C | 27.9 °C | 23.62 mm |
| September | 4.7 °C | 21.7 °C | 30.23 mm |
| October | -0.2 °C | 13 °C | 33.78 mm |
| November | -3.7 °C | 4.7 °C | 31.5 mm |
| December | -7.2 °C | -0.2 °C | 29.97 mm |
| Annual | 0.3 °C | 13.1 °C | 397.77 mm |
| Average First Frost Date | Sep.11 - Sep. 20 |
| Average Last Frost Date | May 21 - May 31 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |