| 2023 Hardiness Zone: | Zone 6a: -10°F to -5°F | |
| 2012 Hardiness Zone: | 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 03109 - Manchester, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 14 | 24 | 34 | 44 | 54 | 59 | 57 | 48 | 37 | 30 | 18 | 36 |
| Avg Max Temp (°F) | 32 | 36 | 44 | 56 | 68 | 77 | 82 | 80 | 72 | 61 | 49 | 37 | 58 |
| Avg Precip (In.) | 3.14 | 2.36 | 3.04 | 3.38 | 3.51 | 3.56 | 3.57 | 3.58 | 3.32 | 3.76 | 3.76 | 3.32 | 40.32 |