Hempstead, New York has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 46.3 °F (low) to 62.5 °F (high). Annual precipitation averages 48.8 Inches. Hempstead 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. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.0 °F | 39.9 °F | 3.8 in. |
| February | 27.2 °F | 42.2 °F | 3.05 in. |
| March | 33.2 °F | 49.0 °F | 4.41 in. |
| April | 42.4 °F | 60.2 °F | 4.05 in. |
| May | 51.8 °F | 69.9 °F | 3.95 in. |
| June | 61.6 °F | 78.9 °F | 4.41 in. |
| July | 67.5 °F | 84.7 °F | 4.28 in. |
| August | 66.4 °F | 83.1 °F | 4.45 in. |
| September | 59.7 °F | 76.6 °F | 4.07 in. |
| October | 49.0 °F | 65.5 °F | 4.69 in. |
| November | 39.3 °F | 54.7 °F | 3.37 in. |
| December | 31.9 °F | 45.3 °F | 4.3 in. |
| Annual | 46.3 °F | 62.5 °F | 48.83 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |