Grand Rapids, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 3.7 °C (low) to 13.9 °C (high). Annual precipitation averages 985.5 Millimeters. Grand Rapids 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. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.1 °C | -1 °C | 73.91 mm |
| February | -7.9 °C | 0.4 °C | 56.9 mm |
| March | -3.9 °C | 6.1 °C | 62.23 mm |
| April | 2 °C | 13.6 °C | 99.06 mm |
| May | 8.1 °C | 20 °C | 104.39 mm |
| June | 13.6 °C | 25.2 °C | 95.25 mm |
| July | 15.6 °C | 27.4 °C | 85.6 mm |
| August | 15 °C | 26.7 °C | 82.55 mm |
| September | 10.7 °C | 22.9 °C | 82.04 mm |
| October | 4.8 °C | 15.6 °C | 95 mm |
| November | -0.4 °C | 7.9 °C | 80.01 mm |
| December | -4.7 °C | 1.8 °C | 68.58 mm |
| Annual | 3.7 °C | 13.9 °C | 985.52 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |