| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| 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: | 58c - Green Mountains/Berkshire Highlands |
| Heat Zone Days: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 01270 - Windsor, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 11 | 20 | 31 | 41 | 50 | 55 | 53 | 45 | 34 | 27 | 16 | 33 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 52 | 64 | 72 | 78 | 75 | 67 | 57 | 45 | 33 | 53 |
| Avg Precip (In.) | 4.18 | 3.21 | 4.41 | 4.87 | 5.89 | 4.9 | 5.26 | 5.16 | 4.82 | 5 | 5.23 | 4.26 | 57.19 |