Harrisville, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.5 °C (low) to 12.2 °C (high). Annual precipitation averages 791.2 Millimeters. Harrisville 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 | -10 °C | -1.8 °C | 47.5 mm |
| February | -10 °C | -0.6 °C | 38.61 mm |
| March | -5.8 °C | 3.9 °C | 45.72 mm |
| April | -0.1 °C | 10 °C | 73.15 mm |
| May | 5.9 °C | 16.7 °C | 84.58 mm |
| June | 11.4 °C | 22.4 °C | 75.18 mm |
| July | 14.9 °C | 25.7 °C | 88.14 mm |
| August | 14.5 °C | 25.2 °C | 82.3 mm |
| September | 10.8 °C | 21.5 °C | 67.06 mm |
| October | 4.6 °C | 14.2 °C | 78.99 mm |
| November | -0.9 °C | 7.4 °C | 56.39 mm |
| December | -5.9 °C | 1.5 °C | 53.59 mm |
| Annual | 2.5 °C | 12.2 °C | 791.21 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |