Cottonwood, Minnesota has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 1.4 °C (low) to 12.8 °C (high). Annual precipitation averages 695.5 Millimeters. Cottonwood is located in USDA Plant Hardiness Zone 4b. 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 | -15.1 °C | -4.9 °C | 17.02 mm |
| February | -12.9 °C | -2.5 °C | 20.57 mm |
| March | -6.1 °C | 4.2 °C | 37.59 mm |
| April | 0.8 °C | 13.1 °C | 65.79 mm |
| May | 8.1 °C | 20.4 °C | 89.15 mm |
| June | 14.2 °C | 26.1 °C | 110.24 mm |
| July | 16.2 °C | 28.3 °C | 87.88 mm |
| August | 14.7 °C | 26.9 °C | 84.84 mm |
| September | 9.8 °C | 23.3 °C | 76.45 mm |
| October | 2.6 °C | 15.2 °C | 53.34 mm |
| November | -4.5 °C | 5.7 °C | 30.99 mm |
| December | -11.2 °C | -2.1 °C | 21.59 mm |
| Annual | 1.4 °C | 12.8 °C | 695.45 mm |
| 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 4b : -31.7°C to -28.9°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |