| 2023 Hardiness Zone: | Zone 4b: -25°F to -20°F Zone 4a: -30°F to -25°F |
| 2012 Hardiness Zone: | Zone 3b: -35°F to -30°F 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 03576 - Colebrook, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 0 | 2 | 14 | 27 | 39 | 48 | 53 | 51 | 43 | 32 | 23 | 9 | 28 |
| Avg Max Temp (°F) | 23 | 27 | 37 | 49 | 64 | 72 | 77 | 74 | 66 | 53 | 40 | 28 | 51 |
| Avg Precip (In.) | 2.86 | 2.01 | 2.67 | 2.69 | 3.82 | 4.13 | 4.2 | 4.54 | 3.73 | 3.46 | 3.41 | 2.84 | 40.36 |