Grand Rapids, Michigan has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38.7 °F (low) to 57 °F (high). Annual precipitation averages 38.8 Inches. 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 | 17.4 °F | 30.2 °F | 2.91 in. |
| February | 17.8 °F | 32.7 °F | 2.24 in. |
| March | 25.0 °F | 43.0 °F | 2.45 in. |
| April | 35.6 °F | 56.4 °F | 3.9 in. |
| May | 46.5 °F | 68.0 °F | 4.11 in. |
| June | 56.5 °F | 77.4 °F | 3.75 in. |
| July | 60.1 °F | 81.4 °F | 3.37 in. |
| August | 59.0 °F | 80.0 °F | 3.25 in. |
| September | 51.2 °F | 73.2 °F | 3.23 in. |
| October | 40.7 °F | 60.1 °F | 3.74 in. |
| November | 31.3 °F | 46.3 °F | 3.15 in. |
| December | 23.5 °F | 35.3 °F | 2.7 in. |
| Annual | 38.7 °F | 57 °F | 38.8 in. |
| 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 : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |