Brentwood, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 45.4 °F (low) to 61.7 °F (high). Annual precipitation averages 49.6 Inches. Brentwood is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.7 °F | 39.6 °F | 3.88 in. |
| February | 25.8 °F | 41.6 °F | 3.44 in. |
| March | 32.1 °F | 48.4 °F | 4.85 in. |
| April | 41.2 °F | 59.7 °F | 4.31 in. |
| May | 50.9 °F | 69.5 °F | 3.76 in. |
| June | 60.9 °F | 78.2 °F | 4.21 in. |
| July | 67.0 °F | 83.6 °F | 3.4 in. |
| August | 65.9 °F | 81.7 °F | 4.2 in. |
| September | 59.2 °F | 75.2 °F | 4.0 in. |
| October | 48.0 °F | 63.9 °F | 4.88 in. |
| November | 38.1 °F | 53.8 °F | 3.73 in. |
| December | 30.6 °F | 45.0 °F | 4.92 in. |
| Annual | 45.4 °F | 61.7 °F | 49.58 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |