Harvey, Michigan has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 34.3 °F (low) to 50 °F (high). Annual precipitation averages 31.8 Inches. Harvey is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 11.5 °F | 25.0 °F | 1.86 in. |
| February | 11.2 °F | 27.2 °F | 1.54 in. |
| March | 19.2 °F | 35.9 °F | 1.75 in. |
| April | 30.2 °F | 45.5 °F | 2.63 in. |
| May | 40.3 °F | 58.4 °F | 3.19 in. |
| June | 49.7 °F | 68.3 °F | 2.98 in. |
| July | 57.1 °F | 74.2 °F | 3.2 in. |
| August | 56.9 °F | 73.8 °F | 2.69 in. |
| September | 49.9 °F | 67.1 °F | 3.73 in. |
| October | 38.9 °F | 53.8 °F | 3.9 in. |
| November | 28.6 °F | 40.9 °F | 2.37 in. |
| December | 18.3 °F | 30.3 °F | 1.96 in. |
| Annual | 34.3 °F | 50 °F | 31.8 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°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 |