Alma, Colorado has a Subarctic With Cool Summers And Year Around Rainfall climate (Köppen classification: Dfc). Average annual temperatures range from 24.1 °F (low) to 47.8 °F (high). Annual precipitation averages 19.9 Inches. 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 | 9.6 °F | 29.4 °F | 1.39 in. |
| February | 8.9 °F | 30.2 °F | 1.36 in. |
| March | 15.3 °F | 37.1 °F | 1.63 in. |
| April | 21.0 °F | 43.7 °F | 2.24 in. |
| May | 28.7 °F | 53.2 °F | 1.97 in. |
| June | 36.5 °F | 64.9 °F | 1.11 in. |
| July | 42.2 °F | 70.1 °F | 2.21 in. |
| August | 40.6 °F | 67.2 °F | 2.44 in. |
| September | 34.6 °F | 61.0 °F | 1.76 in. |
| October | 26.0 °F | 49.4 °F | 1.36 in. |
| November | 16.8 °F | 37.8 °F | 1.17 in. |
| December | 9.3 °F | 29.3 °F | 1.26 in. |
| Annual | 24.1 °F | 47.8 °F | 19.9 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Exceptional Drought |
| Köppen Climate Classification | Dfc - Subarctic With Cool Summers And Year Around Rainfall |