| 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 5a: -20°F to -15°F Zone 5b: -15°F to -10°F | |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F | |
| Average First Frost Date: | Oct. 11 - Oct. 20 | |
| 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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03220 - Belmont, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 11 | 22 | 32 | 43 | 53 | 57 | 56 | 47 | 36 | 28 | 16 | 34 |
| Avg Max Temp (°F) | 29 | 32 | 42 | 54 | 68 | 76 | 81 | 78 | 69 | 58 | 45 | 34 | 56 |
| Avg Precip (In.) | 3.4 | 2.65 | 3.24 | 3.49 | 3.69 | 3.66 | 3.99 | 3.71 | 3.4 | 3.85 | 3.79 | 3.31 | 42.18 |