| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 56f - Lake Michigan Moraines |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49504 - Grand Rapids, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 25 | 35 | 45 | 55 | 59 | 58 | 50 | 40 | 31 | 21 | 38 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 55 | 68 | 77 | 81 | 79 | 71 | 59 | 45 | 34 | 56 |
| Avg Precip (In.) | 2.2 | 1.57 | 2.52 | 3.28 | 3.33 | 3.5 | 3.15 | 3.99 | 3.97 | 2.93 | 3.25 | 2.67 | 36.38 |