| 2023 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F | |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F Zone 3a: -40°F to -35°F | |
| 1990 Hardiness Zone: | Zone 3a: -40F to -35F | |
| Average First Frost Date: | Sep.11 - Sep. 20 | |
| Average Last Frost Date: | Jun. 1 - Jun. 10 | |
| Koppen-Geiger Climate Zone: | Dwb - Humid Continental Mild Summer With Dry Winters | |
| Ecoregion: | 50n - Boundary Lakes and Hills | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55790 - Tower, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | -12 | -6 | 8 | 23 | 35 | 44 | 49 | 47 | 38 | 28 | 13 | -4 | 22 |
| Avg Max Temp (°F) | 15 | 24 | 36 | 51 | 66 | 73 | 77 | 75 | 65 | 52 | 34 | 20 | 49 |
| Avg Precip (In.) | .83 | .71 | 1.04 | 1.61 | 3.02 | 4.45 | 4.35 | 4.23 | 3.93 | 2.84 | 1.4 | .68 | 29.1 |