East Haven, Connecticut has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 15.8 °C (high). Annual precipitation averages 1207.3 Millimeters. East 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 | -4.8 °C | 3.6 °C | 95.5 mm |
| February | -4.1 °C | 4.6 °C | 78.74 mm |
| March | -0.4 °C | 8.3 °C | 111.25 mm |
| April | 4.8 °C | 14.2 °C | 105.16 mm |
| May | 10.3 °C | 19.7 °C | 95.25 mm |
| June | 15.6 °C | 24.7 °C | 102.87 mm |
| July | 19.1 °C | 27.9 °C | 85.85 mm |
| August | 18.6 °C | 27.1 °C | 101.09 mm |
| September | 14.6 °C | 24 °C | 105.16 mm |
| October | 8.4 °C | 17.8 °C | 121.67 mm |
| November | 2.9 °C | 11.8 °C | 94.49 mm |
| December | -1.6 °C | 6.4 °C | 110.24 mm |
| Annual | 7 °C | 15.8 °C | 1207.27 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 |