| 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 | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03057 - Mont Vernon, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 23 | 33 | 43 | 53 | 58 | 56 | 48 | 36 | 28 | 18 | 35 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 56 | 68 | 77 | 82 | 80 | 71 | 61 | 48 | 36 | 57 |
| Avg Precip (In.) | 3.76 | 3.03 | 3.84 | 3.88 | 3.68 | 3.44 | 3.66 | 3.68 | 3.39 | 4.19 | 4.16 | 3.82 | 44.52 |