New Haven, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 6.9 °C (low) to 16 °C (high). Annual precipitation averages 1231.7 Millimeters. New Haven is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.9 °C | 3.4 °C | 96.01 mm |
| February | -4.1 °C | 4.7 °C | 79.5 mm |
| March | -0.4 °C | 8.7 °C | 111.76 mm |
| April | 4.9 °C | 14.5 °C | 106.43 mm |
| May | 10.4 °C | 20.2 °C | 98.81 mm |
| June | 15.8 °C | 25.1 °C | 106.17 mm |
| July | 19.2 °C | 28.4 °C | 90.68 mm |
| August | 18.5 °C | 27.4 °C | 100.84 mm |
| September | 14.5 °C | 24.3 °C | 110.74 mm |
| October | 8.3 °C | 17.8 °C | 123.19 mm |
| November | 2.8 °C | 11.7 °C | 96.27 mm |
| December | -1.7 °C | 6.3 °C | 111.25 mm |
| Annual | 6.9 °C | 16 °C | 1231.65 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |