| 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: | 51i - Big Woods |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55057 - Northfield, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 9 | 22 | 34 | 47 | 56 | 60 | 58 | 49 | 37 | 23 | 9 | 34 |
| Avg Max Temp (°F) | 22 | 28 | 40 | 57 | 70 | 79 | 83 | 80 | 72 | 60 | 41 | 26 | 55 |
| Avg Precip (In.) | .99 | .73 | 1.93 | 2.77 | 3.68 | 4.29 | 4.3 | 4.41 | 3.2 | 2.26 | 1.99 | 1.01 | 31.56 |