| 2023 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F Zone 5b: -15°F to -10°F |
| 2012 Hardiness Zone: | Zone 5a: -20°F to -15°F Zone 4b: -25°F to -20°F |
| 1990 Hardiness Zone: | Zone 4b: -25F to -20F |
| Average First Frost Date: | Sep. 21 - Sep. 30 |
| Average Last Frost Date: | May 11 - May 20 |
| Koppen-Geiger Climate Zone: | Dfc - Subarctic With Cool Summers And Year Around Rainfall |
| Ecoregion: | 58p - White Mountains/Blue Mountains |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03812 - Bartlett, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 5 | 8 | 18 | 29 | 40 | 49 | 54 | 52 | 43 | 33 | 25 | 13 | 31 |
| Avg Max Temp (°F) | 27 | 30 | 39 | 51 | 64 | 72 | 77 | 75 | 66 | 55 | 43 | 32 | 53 |
| Avg Precip (In.) | 4.05 | 3.06 | 4.01 | 4.04 | 4.15 | 4.01 | 4.07 | 4.11 | 3.77 | 4.35 | 4.33 | 4 | 47.95 |