Alpha, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.5 °F (low) to 55.2 °F (high). Annual precipitation averages 31.3 Inches. Alpha is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.7 °F | 23.6 °F | 0.75 in. |
| February | 10.4 °F | 27.8 °F | 0.84 in. |
| March | 22.5 °F | 40.3 °F | 1.72 in. |
| April | 34.5 °F | 56.2 °F | 3.36 in. |
| May | 47.4 °F | 68.7 °F | 4.67 in. |
| June | 58.3 °F | 78.7 °F | 4.66 in. |
| July | 62.0 °F | 82.4 °F | 3.82 in. |
| August | 59.0 °F | 79.6 °F | 3.61 in. |
| September | 50.5 °F | 74.2 °F | 3.12 in. |
| October | 37.6 °F | 59.7 °F | 2.39 in. |
| November | 24.6 °F | 42.9 °F | 1.37 in. |
| December | 12.9 °F | 28.8 °F | 0.96 in. |
| Annual | 35.5 °F | 55.2 °F | 31.27 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |