| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58g - Worcester/Monadnock Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03047 - Greenfield, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 22 | 32 | 43 | 52 | 57 | 55 | 48 | 37 | 28 | 17 | 35 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 67 | 75 | 79 | 77 | 69 | 58 | 46 | 34 | 55 |
| Avg Precip (In.) | 3.99 | 3.15 | 4.04 | 3.96 | 3.97 | 3.84 | 3.88 | 3.92 | 3.74 | 4.23 | 4.25 | 3.95 | 46.92 |