| 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: | Sep. 21 - Sep. 30 |
| 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: | Rare Over 86°F |
Annual Climate Data for ZIP Code 01070 - Plainfield, MA | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 22 | 32 | 44 | 52 | 57 | 55 | 48 | 37 | 28 | 17 | 35 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 52 | 65 | 73 | 78 | 76 | 68 | 58 | 45 | 33 | 54 |
| Avg Precip (In.) | 3.94 | 3.35 | 4.07 | 4.14 | 4.95 | 4.11 | 4.48 | 4.54 | 4.03 | 4.15 | 4.36 | 3.92 | 50.04 |