Chichester, New Hampshire has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36 °F (low) to 57.1 °F (high). Annual precipitation averages 45.2 Inches. Chichester is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 12.1 °F | 30.8 °F | 2.92 in. |
| February | 13.5 °F | 33.9 °F | 3.12 in. |
| March | 22.1 °F | 42.2 °F | 3.69 in. |
| April | 33.2 °F | 55.8 °F | 3.77 in. |
| May | 44.3 °F | 67.7 °F | 3.71 in. |
| June | 54.0 °F | 76.3 °F | 4.21 in. |
| July | 59.4 °F | 81.7 °F | 4.04 in. |
| August | 57.5 °F | 80.3 °F | 3.5 in. |
| September | 49.8 °F | 72.7 °F | 3.99 in. |
| October | 38.3 °F | 59.6 °F | 4.73 in. |
| November | 28.9 °F | 47.5 °F | 3.46 in. |
| December | 19.4 °F | 36.5 °F | 4.07 in. |
| Annual | 36 °F | 57.1 °F | 45.21 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |