Brookside, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 5.5 °C (low) to 16.5 °C (high). Annual precipitation averages 1296.2 Millimeters. Brookside is located in USDA Plant Hardiness Zone 7a. 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 | -6.4 °C | 3.2 °C | 96.77 mm |
| February | -5.8 °C | 4.5 °C | 74.93 mm |
| March | -1.7 °C | 9.1 °C | 110.24 mm |
| April | 4.3 °C | 16.1 °C | 103.38 mm |
| May | 9.7 °C | 21.6 °C | 105.41 mm |
| June | 14.8 °C | 26.4 °C | 129.54 mm |
| July | 17.6 °C | 29.3 °C | 119.63 mm |
| August | 16.7 °C | 28.2 °C | 118.36 mm |
| September | 12.6 °C | 24.4 °C | 117.6 mm |
| October | 6.1 °C | 17.8 °C | 113.03 mm |
| November | 0.8 °C | 11.6 °C | 92.2 mm |
| December | -3.1 °C | 5.9 °C | 115.06 mm |
| Annual | 5.5 °C | 16.5 °C | 1296.15 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |