| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F |
| 2012 Hardiness Zone: | Zone 6a: -10°F to -5°F Zone 5b: -15°F to -10°F |
| 1990 Hardiness Zone: | Zone 1b: -15F to -10F |
| Average First Frost Date: | September 21 - 30 |
| Average Last Frost Date: | May 11 - 20 |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year |
| Ecoregion: | 59f - Gulf of Maine Coastal Lowland |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03840 - Greenland, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 14 | 16 | 25 | 34 | 44 | 53 | 59 | 57 | 50 | 39 | 31 | 21 | 37 |
| Avg Max Temp (°F) | 33 | 36 | 45 | 56 | 67 | 77 | 82 | 80 | 72 | 61 | 49 | 38 | 58 |
| Avg Precip (In.) | 4.18 | 3.37 | 4.27 | 4.33 | 3.62 | 3.61 | 3.45 | 3.44 | 3.85 | 4.36 | 4.8 | 4.41 | 47.69 |