| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°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: | May 21 - May 31 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 58g - Worcester/Monadnock Plateau | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03037 - Deerfield, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 14 | 23 | 32 | 43 | 52 | 57 | 56 | 47 | 36 | 28 | 18 | 35 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 56 | 68 | 77 | 81 | 79 | 71 | 60 | 47 | 36 | 57 |
| Avg Precip (In.) | 3.87 | 3.25 | 4.03 | 4.52 | 4.03 | 4 | 3.71 | 3.73 | 3.97 | 4.51 | 4.8 | 4.14 | 48.56 |