Andover, Minnesota has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 35.2 °F (low) to 54.7 °F (high). Annual precipitation averages 32.8 Inches. Andover is located in USDA Plant Hardiness Zone 4b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 5.8 °F | 23.0 °F | 0.83 in. |
| February | 9.1 °F | 28.2 °F | 0.85 in. |
| March | 21.1 °F | 41.1 °F | 1.61 in. |
| April | 33.9 °F | 55.6 °F | 3.01 in. |
| May | 46.6 °F | 68.4 °F | 4.4 in. |
| June | 56.9 °F | 77.5 °F | 4.68 in. |
| July | 61.9 °F | 82.3 °F | 4.3 in. |
| August | 59.3 °F | 79.8 °F | 4.26 in. |
| September | 50.9 °F | 72.3 °F | 3.33 in. |
| October | 37.9 °F | 57.7 °F | 2.68 in. |
| November | 25.6 °F | 42.1 °F | 1.7 in. |
| December | 12.9 °F | 28.3 °F | 1.18 in. |
| Annual | 35.2 °F | 54.7 °F | 32.83 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 4b : -25°F to -20°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |