Westbury, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.8 °F (low) to 62.4 °F (high). Annual precipitation averages 48.4 Inches. Westbury is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 25.6 °F | 39.8 °F | 3.79 in. |
| February | 26.7 °F | 42.3 °F | 3.08 in. |
| March | 32.7 °F | 49.3 °F | 4.36 in. |
| April | 41.9 °F | 60.2 °F | 4.05 in. |
| May | 51.4 °F | 69.9 °F | 3.88 in. |
| June | 61.0 °F | 79.0 °F | 4.34 in. |
| July | 66.9 °F | 84.3 °F | 4.11 in. |
| August | 65.8 °F | 82.7 °F | 4.39 in. |
| September | 59.0 °F | 76.2 °F | 4.07 in. |
| October | 48.0 °F | 65.3 °F | 4.68 in. |
| November | 38.8 °F | 54.5 °F | 3.37 in. |
| December | 31.4 °F | 45.2 °F | 4.31 in. |
| Annual | 45.8 °F | 62.4 °F | 48.43 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Cfa - Humid Subtropical Climate |