Heeney, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -5.3 °C (low) to 12 °C (high). Annual precipitation averages 353.1 Millimeters. Heeney is located in USDA Plant Hardiness Zone 4b. 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 | -17.2 °C | -1.9 °C | 21.59 mm |
| February | -15.1 °C | 0.6 °C | 24.13 mm |
| March | -9.7 °C | 6.1 °C | 26.42 mm |
| April | -5.2 °C | 10.7 °C | 37.34 mm |
| May | -0.8 °C | 16.3 °C | 36.32 mm |
| June | 2.7 °C | 22.8 °C | 25.65 mm |
| July | 6.2 °C | 26.1 °C | 34.8 mm |
| August | 5.1 °C | 24.8 °C | 36.58 mm |
| September | 0.9 °C | 20.8 °C | 34.29 mm |
| October | -4.5 °C | 13.3 °C | 32.51 mm |
| November | -9.9 °C | 5.3 °C | 20.07 mm |
| December | -15.9 °C | -1.3 °C | 23.37 mm |
| Annual | -5.3 °C | 12 °C | 353.07 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |