| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F | |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F | |
| 1990 Hardiness Zone: | Zone 4a: -30F to -25F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 1 - May 10 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 47b - Des Moines Lobe | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 56201 - Willmar, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -1 | 7 | 20 | 34 | 47 | 56 | 61 | 58 | 48 | 36 | 21 | 6 | 33 |
| Avg Max Temp (°F) | 19 | 26 | 38 | 55 | 70 | 78 | 82 | 80 | 71 | 58 | 38 | 24 | 53 |
| Avg Precip (In.) | .84 | .64 | 1.59 | 2.2 | 3.25 | 5.11 | 3.75 | 3.8 | 2.81 | 2.19 | 1.55 | .68 | 28.42 |