Brewster, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.6 °F (low) to 60.4 °F (high). Annual precipitation averages 49 Inches. Brewster 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 | 18.4 °F | 36.0 °F | 3.76 in. |
| February | 20.3 °F | 39.1 °F | 2.61 in. |
| March | 27.5 °F | 47.0 °F | 3.84 in. |
| April | 38.2 °F | 59.7 °F | 3.83 in. |
| May | 48.1 °F | 70.1 °F | 3.35 in. |
| June | 57.3 °F | 78.2 °F | 3.96 in. |
| July | 62.6 °F | 83.4 °F | 4.59 in. |
| August | 61.3 °F | 81.5 °F | 5.43 in. |
| September | 53.7 °F | 74.7 °F | 4.48 in. |
| October | 42.3 °F | 62.9 °F | 4.83 in. |
| November | 32.7 °F | 51.6 °F | 4.21 in. |
| December | 24.7 °F | 40.8 °F | 4.1 in. |
| Annual | 40.6 °F | 60.4 °F | 48.99 in. |
| 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 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |