Windom, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 35.1 °F (low) to 55 °F (high). Annual precipitation averages 30.6 Inches. Windom is located in USDA Plant Hardiness Zone 5a. 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 | 6.1 °F | 23.3 °F | 0.76 in. |
| February | 9.9 °F | 27.7 °F | 0.83 in. |
| March | 21.9 °F | 40.1 °F | 1.63 in. |
| April | 34.1 °F | 56.1 °F | 3.09 in. |
| May | 47.1 °F | 68.4 °F | 4.36 in. |
| June | 58.1 °F | 78.5 °F | 4.76 in. |
| July | 61.8 °F | 82.2 °F | 3.71 in. |
| August | 58.9 °F | 79.7 °F | 3.61 in. |
| September | 50.3 °F | 73.8 °F | 3.16 in. |
| October | 37.1 °F | 59.4 °F | 2.4 in. |
| November | 24.0 °F | 42.4 °F | 1.37 in. |
| December | 12.3 °F | 28.6 °F | 0.93 in. |
| Annual | 35.1 °F | 55 °F | 30.61 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 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 |