| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F | |
| 2012 Hardiness Zone: | 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. 1 - Oct. 10 | |
| Average Last Frost Date: | May 21 - May 31 | |
| 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 03235 - Franklin, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 6 | 9 | 21 | 32 | 42 | 52 | 56 | 55 | 45 | 34 | 27 | 14 | 33 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 68 | 77 | 81 | 79 | 70 | 59 | 46 | 34 | 56 |
| Avg Precip (In.) | 3.49 | 2.71 | 3.29 | 3.42 | 3.68 | 3.73 | 4 | 3.76 | 3.36 | 3.9 | 3.8 | 3.4 | 42.55 |