East Brooklyn, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.5 °C (low) to 16.1 °C (high). Annual precipitation averages 1261.6 Millimeters. East Brooklyn 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 | -7.7 °C | 2.8 °C | 96.52 mm |
| February | -6.7 °C | 4.3 °C | 86.61 mm |
| March | -2.7 °C | 8.6 °C | 116.08 mm |
| April | 2.8 °C | 15.5 °C | 114.55 mm |
| May | 8.4 °C | 21.3 °C | 89.41 mm |
| June | 13.4 °C | 25.7 °C | 105.92 mm |
| July | 17.1 °C | 28.6 °C | 94.23 mm |
| August | 15.9 °C | 27.6 °C | 112.27 mm |
| September | 11.8 °C | 23.8 °C | 106.17 mm |
| October | 5.7 °C | 17.4 °C | 123.19 mm |
| November | 0.2 °C | 11.4 °C | 99.57 mm |
| December | -4.2 °C | 5.8 °C | 117.09 mm |
| Annual | 4.5 °C | 16.1 °C | 1261.61 mm |
| 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 : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |