| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 6b: -5°F to 0°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°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: | 59f - Gulf of Maine Coastal Lowland | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03874 - Seabrook, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 16 | 18 | 27 | 35 | 45 | 54 | 60 | 59 | 51 | 40 | 32 | 22 | 38 |
| Avg Max Temp (°F) | 34 | 36 | 45 | 56 | 66 | 76 | 81 | 79 | 71 | 61 | 49 | 39 | 58 |
| Avg Precip (In.) | 4.12 | 3.37 | 4.14 | 4.4 | 3.61 | 3.66 | 3.54 | 3.34 | 3.94 | 4.3 | 4.62 | 4.21 | 47.25 |