| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 1 - May 10 |
| Koppen-Geiger Climate Zone: | Dfa - Humid Continental Hot Summers |
| Ecoregion: | 56g - Lansing Loamy Plain |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49506 - Grand Rapids, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 15 | 17 | 25 | 36 | 46 | 55 | 60 | 58 | 50 | 40 | 31 | 21 | 38 |
| Avg Max Temp (°F) | 29 | 32 | 43 | 56 | 68 | 77 | 81 | 79 | 71 | 59 | 45 | 34 | 56 |
| Avg Precip (In.) | 2.16 | 1.57 | 2.53 | 3.35 | 3.31 | 3.58 | 3.29 | 3.91 | 4.07 | 2.88 | 3.26 | 2.69 | 36.59 |