Nassau, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 38.4 °F (low) to 58.7 °F (high). Annual precipitation averages 43.2 Inches. Nassau is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 15.2 °F | 32.5 °F | 2.79 in. |
| February | 16.5 °F | 35.5 °F | 2.27 in. |
| March | 24.9 °F | 44.3 °F | 2.96 in. |
| April | 35.9 °F | 58.3 °F | 3.36 in. |
| May | 46.8 °F | 70.2 °F | 3.62 in. |
| June | 55.9 °F | 78.0 °F | 4.56 in. |
| July | 60.7 °F | 82.7 °F | 4.36 in. |
| August | 59.2 °F | 80.9 °F | 4.28 in. |
| September | 51.3 °F | 73.8 °F | 4.2 in. |
| October | 40.4 °F | 61.1 °F | 4.31 in. |
| November | 31.1 °F | 48.9 °F | 3.03 in. |
| December | 22.3 °F | 37.8 °F | 3.41 in. |
| Annual | 38.4 °F | 58.7 °F | 43.15 in. |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |