Manchester, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 37.4 °F (low) to 58.6 °F (high). Annual precipitation averages 43.1 Inches. Manchester is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 13.7 °F | 33.2 °F | 2.85 in. |
| February | 15.4 °F | 36.1 °F | 2.86 in. |
| March | 23.8 °F | 44.1 °F | 3.34 in. |
| April | 34.7 °F | 57.1 °F | 3.5 in. |
| May | 45.6 °F | 68.4 °F | 3.49 in. |
| June | 55.1 °F | 77.5 °F | 4.18 in. |
| July | 60.7 °F | 82.5 °F | 3.66 in. |
| August | 58.8 °F | 81.1 °F | 3.65 in. |
| September | 51.1 °F | 73.8 °F | 3.71 in. |
| October | 39.3 °F | 60.7 °F | 4.42 in. |
| November | 29.8 °F | 49.5 °F | 3.5 in. |
| December | 20.6 °F | 38.6 °F | 3.91 in. |
| Annual | 37.4 °F | 58.6 °F | 43.07 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |