Forest Hills, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 4 °C (low) to 14 °C (high). Annual precipitation averages 977.1 Millimeters. Forest Hills is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | -0.9 °C | 71.12 mm |
| February | -7.8 °C | 0.3 °C | 54.86 mm |
| March | -3.8 °C | 6.1 °C | 60.45 mm |
| April | 2.3 °C | 13.7 °C | 96.77 mm |
| May | 8.3 °C | 20 °C | 104.9 mm |
| June | 13.9 °C | 25.5 °C | 95.5 mm |
| July | 16.1 °C | 27.7 °C | 87.12 mm |
| August | 15.4 °C | 26.8 °C | 87.63 mm |
| September | 11 °C | 23 °C | 82.55 mm |
| October | 5.1 °C | 15.8 °C | 92.96 mm |
| November | -0.2 °C | 8.2 °C | 77.72 mm |
| December | -4.6 °C | 2 °C | 65.53 mm |
| Annual | 4 °C | 14 °C | 977.11 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |