Gunnison, Colorado has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -5.8 °C (low) to 12.6 °C (high). Annual precipitation averages 283.2 Millimeters. Gunnison is located in USDA Plant Hardiness Zone 4a. The growing season typically runs from the last frost around Jun. 11 - Jun. 20 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -20 °C | -3.3 °C | 24.64 mm |
| February | -16.8 °C | -0.4 °C | 19.81 mm |
| March | -9.8 °C | 6.8 °C | 17.02 mm |
| April | -5.2 °C | 12.5 °C | 20.83 mm |
| May | -0.8 °C | 18.2 °C | 22.86 mm |
| June | 3.1 °C | 23.9 °C | 13.46 mm |
| July | 6.9 °C | 26.4 °C | 30.48 mm |
| August | 6 °C | 25.4 °C | 45.97 mm |
| September | 1.2 °C | 21.8 °C | 29.46 mm |
| October | -4.9 °C | 15.3 °C | 18.03 mm |
| November | -10.9 °C | 6.9 °C | 17.02 mm |
| December | -17.9 °C | -1.8 °C | 23.62 mm |
| Annual | -5.8 °C | 12.6 °C | 283.2 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 11 - Jun. 20 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 4a : -34.4°C to -31.7°C |
| Plant Hardiness Zone - 2012 | Zone 4a : -34.4°C to -31.7°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |