Hanover, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.9 °F (low) to 57.4 °F (high). Annual precipitation averages 37.5 Inches. Hanover is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 16.3 °F | 30.4 °F | 2.37 in. |
| February | 17.2 °F | 33.5 °F | 2.04 in. |
| March | 25.2 °F | 43.7 °F | 2.36 in. |
| April | 36.3 °F | 56.9 °F | 3.46 in. |
| May | 48.3 °F | 68.8 °F | 4.01 in. |
| June | 57.6 °F | 78.0 °F | 3.9 in. |
| July | 60.7 °F | 81.7 °F | 3.72 in. |
| August | 59.0 °F | 79.5 °F | 3.81 in. |
| September | 51.7 °F | 73.5 °F | 3.41 in. |
| October | 40.7 °F | 60.7 °F | 3.33 in. |
| November | 30.8 °F | 47.1 °F | 2.83 in. |
| December | 22.7 °F | 35.2 °F | 2.3 in. |
| Annual | 38.9 °F | 57.4 °F | 37.54 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |