| 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: | Sep. 21 - Sep. 30 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 50b - Minnesota/Wisconsin Upland Till Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 56431 - Aitkin, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -4 | 3 | 15 | 29 | 41 | 50 | 55 | 53 | 44 | 33 | 20 | 4 | 29 |
| Avg Max Temp (°F) | 18 | 26 | 38 | 53 | 67 | 75 | 79 | 77 | 67 | 55 | 36 | 22 | 51 |
| Avg Precip (In.) | .98 | .66 | 1.51 | 2.03 | 3.09 | 4.31 | 4.62 | 3.93 | 2.94 | 2.49 | 1.78 | .8 | 29.14 |