| 2023 Hardiness Zone: | 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 03307 - Loudon, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 9 | 12 | 22 | 32 | 42 | 52 | 57 | 55 | 47 | 35 | 28 | 16 | 34 |
| Avg Max Temp (°F) | 30 | 33 | 42 | 55 | 68 | 76 | 81 | 79 | 70 | 59 | 46 | 34 | 56 |
| Avg Precip (In.) | 3.21 | 2.5 | 3.14 | 3.35 | 3.5 | 3.48 | 3.77 | 3.54 | 3.36 | 3.72 | 3.7 | 3.19 | 40.45 |