New Britain, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 41.1 °F (low) to 60.7 °F (high). Annual precipitation averages 51.7 Inches. New Britain is located in USDA Plant Hardiness Zone 6b. 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 | 19.2 °F | 36.3 °F | 3.88 in. |
| February | 20.4 °F | 39.0 °F | 3.44 in. |
| March | 28.0 °F | 46.9 °F | 4.16 in. |
| April | 38.2 °F | 59.4 °F | 4.14 in. |
| May | 48.5 °F | 70.2 °F | 3.86 in. |
| June | 57.9 °F | 78.7 °F | 4.91 in. |
| July | 63.4 °F | 84.2 °F | 4.16 in. |
| August | 61.7 °F | 82.4 °F | 4.35 in. |
| September | 54.3 °F | 75.2 °F | 4.61 in. |
| October | 42.8 °F | 63.2 °F | 5.44 in. |
| November | 33.1 °F | 51.8 °F | 3.97 in. |
| December | 25.1 °F | 41.6 °F | 4.74 in. |
| Annual | 41.1 °F | 60.7 °F | 51.66 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 6b : -5°F to 0°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |