Brooklyn, Connecticut has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 39.9 °F (low) to 60.7 °F (high). Annual precipitation averages 49.7 Inches. Brooklyn is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 18.2 °F | 37.0 °F | 3.78 in. |
| February | 19.7 °F | 39.5 °F | 3.42 in. |
| March | 27.1 °F | 47.1 °F | 4.55 in. |
| April | 36.8 °F | 59.7 °F | 4.51 in. |
| May | 46.9 °F | 70.0 °F | 3.53 in. |
| June | 56.0 °F | 77.8 °F | 4.19 in. |
| July | 62.3 °F | 82.9 °F | 3.73 in. |
| August | 60.3 °F | 81.3 °F | 4.44 in. |
| September | 52.9 °F | 74.7 °F | 4.19 in. |
| October | 42.1 °F | 63.2 °F | 4.84 in. |
| November | 32.3 °F | 52.4 °F | 3.91 in. |
| December | 24.2 °F | 42.2 °F | 4.58 in. |
| Annual | 39.9 °F | 60.7 °F | 49.67 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |