Harrisville, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.4 °F (low) to 53.9 °F (high). Annual precipitation averages 31.2 Inches. 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 | 14.0 °F | 28.8 °F | 1.87 in. |
| February | 14.0 °F | 30.9 °F | 1.52 in. |
| March | 21.5 °F | 39.0 °F | 1.8 in. |
| April | 31.8 °F | 50.0 °F | 2.88 in. |
| May | 42.6 °F | 62.0 °F | 3.33 in. |
| June | 52.6 °F | 72.3 °F | 2.96 in. |
| July | 58.8 °F | 78.2 °F | 3.47 in. |
| August | 58.1 °F | 77.3 °F | 3.24 in. |
| September | 51.4 °F | 70.7 °F | 2.64 in. |
| October | 40.2 °F | 57.5 °F | 3.11 in. |
| November | 30.3 °F | 45.3 °F | 2.22 in. |
| December | 21.3 °F | 34.7 °F | 2.11 in. |
| Annual | 36.4 °F | 53.9 °F | 31.15 in. |
| 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 : -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 |