Alma, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.2 °F (low) to 56.9 °F (high). Annual precipitation averages 34.4 Inches. Alma is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 14.8 °F | 29.4 °F | 2.15 in. |
| February | 15.0 °F | 31.8 °F | 1.78 in. |
| March | 23.1 °F | 42.4 °F | 2.06 in. |
| April | 34.3 °F | 56.1 °F | 3.52 in. |
| May | 46.1 °F | 68.4 °F | 3.75 in. |
| June | 55.9 °F | 78.0 °F | 3.62 in. |
| July | 59.2 °F | 82.0 °F | 3.14 in. |
| August | 57.4 °F | 80.0 °F | 3.67 in. |
| September | 49.5 °F | 73.4 °F | 2.77 in. |
| October | 39.1 °F | 60.2 °F | 3.28 in. |
| November | 30.0 °F | 46.5 °F | 2.57 in. |
| December | 21.5 °F | 34.8 °F | 2.04 in. |
| Annual | 37.2 °F | 56.9 °F | 34.35 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |