Hanover, Wisconsin has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 37.9 °F (low) to 57.6 °F (high). Annual precipitation averages 37.4 Inches. Hanover is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.9 °F | 28.0 °F | 1.58 in. |
| February | 14.9 °F | 32.0 °F | 1.61 in. |
| March | 25.4 °F | 44.3 °F | 2.08 in. |
| April | 36.1 °F | 57.7 °F | 3.66 in. |
| May | 48.1 °F | 69.6 °F | 4.23 in. |
| June | 57.8 °F | 79.5 °F | 5.34 in. |
| July | 61.8 °F | 83.0 °F | 3.86 in. |
| August | 60.0 °F | 81.4 °F | 4.26 in. |
| September | 51.5 °F | 74.7 °F | 3.69 in. |
| October | 40.0 °F | 61.5 °F | 2.93 in. |
| November | 28.8 °F | 46.2 °F | 2.32 in. |
| December | 18.6 °F | 33.5 °F | 1.87 in. |
| Annual | 37.9 °F | 57.6 °F | 37.43 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |