| 2023 Hardiness Zone: | Zone 4a: -30°F to -25°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 4a: -30°F to -25°F | |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F | |
| Average First Frost Date: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 51j - Alexandria Moraines and Detroit Lakes Outwash Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 56571 - Ottertail, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -3 | 4 | 17 | 32 | 46 | 56 | 61 | 59 | 48 | 37 | 21 | 5 | 32 |
| Avg Max Temp (°F) | 19 | 26 | 38 | 56 | 70 | 78 | 82 | 80 | 70 | 57 | 37 | 24 | 53 |
| Avg Precip (In.) | .89 | .61 | 1.39 | 1.96 | 3.09 | 4.57 | 3.98 | 3.37 | 2.48 | 2.4 | 1.19 | .57 | 26.51 |