| 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 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: | May 21 - May 31 |
| 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 03221 - Bradford, 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 | 56 | 47 | 36 | 28 | 17 | 35 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 68 | 76 | 80 | 78 | 69 | 58 | 45 | 34 | 56 |
| Avg Precip (In.) | 3.97 | 3.17 | 4.03 | 4.11 | 4.3 | 3.9 | 3.69 | 4.3 | 3.76 | 4.18 | 4.46 | 4.13 | 48 |