| 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. 11 - Oct. 20 | |
| Average Last Frost Date: | May 1 - May 10 | |
| 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 03102 - Manchester, NH | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Annual |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg Min Temp (°F) | 11 | 13 | 23 | 33 | 44 | 53 | 58 | 56 | 48 | 37 | 29 | 18 | 35 |
| Avg Max Temp (°F) | 32 | 35 | 44 | 56 | 68 | 77 | 82 | 80 | 72 | 61 | 48 | 37 | 58 |
| Avg Precip (In.) | 3.27 | 2.42 | 3.2 | 3.46 | 3.55 | 3.52 | 3.58 | 3.6 | 3.35 | 3.81 | 3.81 | 3.4 | 40.96 |