North Branford, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 41.7 °F (low) to 60.5 °F (high). Annual precipitation averages 50.6 Inches. North Branford is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 20.4 °F | 36.7 °F | 3.96 in. |
| February | 21.6 °F | 39.1 °F | 3.38 in. |
| March | 28.7 °F | 46.9 °F | 4.89 in. |
| April | 38.5 °F | 58.8 °F | 4.47 in. |
| May | 48.3 °F | 69.5 °F | 3.96 in. |
| June | 57.8 °F | 78.0 °F | 4.24 in. |
| July | 63.7 °F | 83.3 °F | 3.52 in. |
| August | 62.3 °F | 81.6 °F | 4.03 in. |
| September | 55.0 °F | 74.8 °F | 4.47 in. |
| October | 43.6 °F | 63.2 °F | 5.13 in. |
| November | 33.9 °F | 52.0 °F | 3.94 in. |
| December | 26.1 °F | 42.0 °F | 4.57 in. |
| Annual | 41.7 °F | 60.5 °F | 50.56 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 6b : -5°F to 0°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |