| 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: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59f - Gulf of Maine Coastal Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03824 - Durham, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 25 | 34 | 44 | 53 | 59 | 57 | 49 | 38 | 30 | 20 | 37 |
| Avg Max Temp (°F) | 33 | 37 | 45 | 57 | 68 | 77 | 82 | 80 | 72 | 61 | 49 | 38 | 58 |
| Avg Precip (In.) | 3.26 | 2.91 | 3.65 | 4.16 | 3.63 | 3.49 | 3.38 | 3.4 | 3.56 | 4.15 | 4.54 | 3.71 | 43.84 |