| 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: | Oct. 1 - Oct. 10 | |
| Average Last Frost Date: | May 11 - May 20 | |
| Koppen-Geiger Climate Zone: | Dfb - Humid Continental Mild Summer, Wet All Year | |
| Ecoregion: | 59h - Gulf of Maine Coastal Plain | |
| Current Drought Status: | Exceptional Drought | |
| Heat Zone Days: | Rare Over 86°F |
Annual Climate Data for ZIP Code 03087 - Windham, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 12 | 15 | 24 | 33 | 43 | 53 | 58 | 56 | 48 | 37 | 29 | 19 | 36 |
| Avg Max Temp (°F) | 34 | 37 | 46 | 58 | 69 | 78 | 83 | 81 | 73 | 62 | 50 | 38 | 59 |
| Avg Precip (In.) | 3.88 | 3.08 | 3.88 | 4.04 | 3.59 | 3.7 | 3.58 | 3.45 | 3.74 | 4.06 | 4.32 | 3.8 | 45.12 |