| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| 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: | 58q - Sunapee Uplands | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03240 - Grafton, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 7 | 18 | 29 | 40 | 49 | 53 | 52 | 43 | 32 | 25 | 13 | 30 |
| Avg Max Temp (°F) | 28 | 31 | 40 | 53 | 66 | 74 | 79 | 77 | 68 | 57 | 44 | 33 | 54 |
| Avg Precip (In.) | 2.94 | 2.34 | 2.91 | 3.21 | 3.74 | 3.7 | 3.92 | 3.6 | 3.37 | 3.8 | 3.39 | 2.95 | 39.87 |