Harper Woods, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.9 °F (low) to 58.8 °F (high). Annual precipitation averages 34.9 Inches. Harper Woods is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 19.3 °F | 32.4 °F | 2.43 in. |
| February | 20.2 °F | 35.0 °F | 2.07 in. |
| March | 27.6 °F | 44.5 °F | 2.4 in. |
| April | 38.1 °F | 57.4 °F | 3.2 in. |
| May | 49.4 °F | 69.1 °F | 3.77 in. |
| June | 59.7 °F | 79.2 °F | 3.3 in. |
| July | 64.4 °F | 83.4 °F | 3.28 in. |
| August | 63.3 °F | 81.4 °F | 3.41 in. |
| September | 56.0 °F | 74.9 °F | 3.13 in. |
| October | 44.7 °F | 62.0 °F | 2.82 in. |
| November | 34.3 °F | 48.6 °F | 2.67 in. |
| December | 25.7 °F | 37.5 °F | 2.42 in. |
| Annual | 41.9 °F | 58.8 °F | 34.9 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |