| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°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: | 51h - St. Croix Outwash Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 55304 - Andover, MN | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 1 | 8 | 21 | 34 | 46 | 55 | 60 | 58 | 49 | 37 | 23 | 9 | 33 |
| Avg Max Temp (°F) | 21 | 28 | 40 | 57 | 70 | 78 | 82 | 79 | 70 | 58 | 39 | 25 | 54 |
| Avg Precip (In.) | .96 | .79 | 1.63 | 2.35 | 3.33 | 4.47 | 4.09 | 4.51 | 3.23 | 2.26 | 1.89 | .89 | 30.4 |