| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 11 - Oct. 20 |
| Average Last Frost Date: | May 21 - May 31 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 51m - Manistee-Leelanau Shore |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 49690 - Williamsburg, MI | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 13 | 21 | 31 | 41 | 51 | 57 | 56 | 49 | 39 | 30 | 20 | 35 |
| Avg Max Temp (°F) | 27 | 30 | 40 | 53 | 67 | 76 | 81 | 78 | 70 | 58 | 44 | 32 | 55 |
| Avg Precip (In.) | 2.6 | 1.62 | 1.99 | 2.55 | 2.45 | 3.13 | 3.07 | 3.43 | 3.74 | 3.11 | 2.76 | 2.48 | 32.91 |