| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 1 - 7 days Over 86°F |
Annual Climate Data for ZIP Code 01012 - Chesterfield, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 12 | 21 | 32 | 43 | 52 | 57 | 55 | 46 | 35 | 28 | 17 | 34 |
| Avg Max Temp (°F) | 30 | 34 | 43 | 55 | 68 | 76 | 81 | 79 | 71 | 60 | 47 | 35 | 57 |
| Avg Precip (In.) | 4.13 | 3.37 | 4.37 | 4.33 | 4.81 | 4.36 | 4.51 | 4.63 | 4.25 | 4.31 | 4.51 | 4.01 | 51.58 |