| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Oct. 1 - Oct. 10 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58e - Berkshire Transition |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01096 - Williamsburg, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 12 | 22 | 32 | 43 | 52 | 57 | 55 | 47 | 35 | 28 | 18 | 34 |
| Avg Max Temp (°F) | 31 | 34 | 44 | 56 | 68 | 77 | 82 | 79 | 71 | 60 | 48 | 36 | 57 |
| Avg Precip (In.) | 3.96 | 3.26 | 4.15 | 4.15 | 4.61 | 4.06 | 4.35 | 4.49 | 4.11 | 4.1 | 4.41 | 3.8 | 49.45 |