| 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 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 5a: -20F to -15F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | Jun. 1 - Jun. 10 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 58q - Sunapee Uplands |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03450 - Harrisville, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 10 | 11 | 20 | 31 | 42 | 50 | 55 | 54 | 46 | 35 | 27 | 16 | 33 |
| Avg Max Temp (°F) | 29 | 32 | 41 | 53 | 67 | 74 | 78 | 75 | 67 | 57 | 45 | 33 | 54 |
| Avg Precip (In.) | 4.12 | 3.26 | 4 | 4.08 | 4.25 | 4.05 | 4.16 | 4.26 | 3.88 | 4.21 | 4.18 | 3.97 | 48.43 |