| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F 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 03820 - Dover, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 13 | 16 | 25 | 34 | 44 | 53 | 58 | 57 | 49 | 38 | 30 | 20 | 36 |
| Avg Max Temp (°F) | 33 | 37 | 45 | 57 | 69 | 78 | 83 | 81 | 73 | 62 | 49 | 38 | 59 |
| Avg Precip (In.) | 3.36 | 2.93 | 3.66 | 4.17 | 3.66 | 3.51 | 3.41 | 3.44 | 3.55 | 4.17 | 4.54 | 3.73 | 44.16 |