| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 1990 Hardiness Zone: | Zone 3b: -35F to -30F |
| Average First Frost Date: | Sep.11 - Sep. 20 |
| Average Last Frost Date: | Jun. 11 - Jun. 20 |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall |
| Ecoregion: | 58o - Northern Connecticut Valley |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03582 - Groveton, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 2 | 3 | 15 | 28 | 39 | 49 | 54 | 52 | 44 | 33 | 24 | 10 | 29 |
| Avg Max Temp (°F) | 25 | 28 | 38 | 51 | 65 | 73 | 78 | 75 | 67 | 55 | 41 | 29 | 52 |
| Avg Precip (In.) | 2.77 | 2.05 | 2.62 | 2.85 | 3.47 | 4.01 | 4.08 | 4.37 | 3.59 | 3.34 | 3.32 | 2.88 | 39.34 |