Brooklyn, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.9 °F (low) to 62.9 °F (high). Annual precipitation averages 45.7 Inches. Brooklyn is located in USDA Plant Hardiness Zone 6a. 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 | 20.3 °F | 36.3 °F | 3.13 in. |
| February | 23.0 °F | 40.7 °F | 2.58 in. |
| March | 31.0 °F | 51.5 °F | 3.44 in. |
| April | 41.5 °F | 63.9 °F | 4.89 in. |
| May | 52.2 °F | 73.4 °F | 5.09 in. |
| June | 61.4 °F | 81.7 °F | 5.3 in. |
| July | 64.7 °F | 84.8 °F | 4.37 in. |
| August | 63.0 °F | 84.1 °F | 3.24 in. |
| September | 55.4 °F | 78.5 °F | 3.44 in. |
| October | 43.2 °F | 66.3 °F | 3.47 in. |
| November | 33.1 °F | 52.4 °F | 3.56 in. |
| December | 25.4 °F | 40.9 °F | 3.19 in. |
| Annual | 42.9 °F | 62.9 °F | 45.7 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 6a : -10°F to -5°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |