Hermansville, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from -0.3 °C (low) to 11.6 °C (high). Annual precipitation averages 820.9 Millimeters. 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 | -14.3 °C | -4.1 °C | 40.39 mm |
| February | -14.1 °C | -2 °C | 32 mm |
| March | -8.7 °C | 3.8 °C | 49.02 mm |
| April | -1.9 °C | 10.4 °C | 75.69 mm |
| May | 4.7 °C | 18.2 °C | 85.85 mm |
| June | 10.2 °C | 23.5 °C | 89.41 mm |
| July | 12.7 °C | 26.1 °C | 97.28 mm |
| August | 11.9 °C | 25.2 °C | 74.93 mm |
| September | 7.8 °C | 20.8 °C | 92.2 mm |
| October | 1.6 °C | 13.1 °C | 77.98 mm |
| November | -3.9 °C | 5.2 °C | 59.94 mm |
| December | -10.2 °C | -1.2 °C | 46.23 mm |
| Annual | -0.3 °C | 11.6 °C | 820.92 mm |
| 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 : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |