Hermansville, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 31.4 °F (low) to 52.9 °F (high). Annual precipitation averages 32.3 Inches. Hermansville is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.3 °F | 24.7 °F | 1.59 in. |
| February | 6.6 °F | 28.4 °F | 1.26 in. |
| March | 16.3 °F | 38.8 °F | 1.93 in. |
| April | 28.5 °F | 50.8 °F | 2.98 in. |
| May | 40.4 °F | 64.8 °F | 3.38 in. |
| June | 50.4 °F | 74.3 °F | 3.52 in. |
| July | 54.9 °F | 79.0 °F | 3.83 in. |
| August | 53.5 °F | 77.4 °F | 2.95 in. |
| September | 46.0 °F | 69.4 °F | 3.63 in. |
| October | 34.9 °F | 55.6 °F | 3.07 in. |
| November | 25.0 °F | 41.3 °F | 2.36 in. |
| December | 13.7 °F | 29.9 °F | 1.82 in. |
| Annual | 31.4 °F | 52.9 °F | 32.32 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -20°F to -15°F |
| Plant Hardiness Zone - 2012 | Zone 4b : -25°F to -20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |