| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 5b: -15°F to -10°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: | 58g - Worcester/Monadnock Plateau |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03086 - Wilton, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 23 | 33 | 43 | 52 | 58 | 56 | 47 | 36 | 28 | 17 | 35 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 56 | 68 | 76 | 81 | 79 | 71 | 60 | 47 | 36 | 57 |
| Avg Precip (In.) | 3.65 | 2.97 | 3.67 | 3.73 | 3.49 | 3.5 | 3.67 | 3.72 | 3.38 | 4.02 | 4.05 | 3.63 | 43.47 |