Alma, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from -4.4 °C (low) to 8.8 °C (high). Annual precipitation averages 505.5 Millimeters. Alma is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Jun. 1 - Jun. 10 through the first frost around Aug. 21 - Aug. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.4 °C | -1.4 °C | 35.31 mm |
| February | -12.8 °C | -1 °C | 34.54 mm |
| March | -9.3 °C | 2.8 °C | 41.4 mm |
| April | -6.1 °C | 6.5 °C | 56.9 mm |
| May | -1.8 °C | 11.8 °C | 50.04 mm |
| June | 2.5 °C | 18.3 °C | 28.19 mm |
| July | 5.7 °C | 21.2 °C | 56.13 mm |
| August | 4.8 °C | 19.6 °C | 61.98 mm |
| September | 1.4 °C | 16.1 °C | 44.7 mm |
| October | -3.3 °C | 9.7 °C | 34.54 mm |
| November | -8.4 °C | 3.2 °C | 29.72 mm |
| December | -12.6 °C | -1.5 °C | 32 mm |
| Annual | -4.4 °C | 8.8 °C | 505.45 mm |
| Average First Frost Date | Aug. 21 - Aug. 31 |
| Average Last Frost Date | Jun. 1 - Jun. 10 |
| Average Days With Frost | Over 180 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |