Setauket, 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 61.9 °F (high). Annual precipitation averages 46.5 Inches. Setauket 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. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 24.8 °F | 39.6 °F | 3.63 in. |
| February | 25.9 °F | 41.3 °F | 3.15 in. |
| March | 31.8 °F | 48.5 °F | 4.27 in. |
| April | 41.1 °F | 60.1 °F | 4.07 in. |
| May | 50.9 °F | 69.9 °F | 3.67 in. |
| June | 60.4 °F | 78.0 °F | 3.94 in. |
| July | 66.5 °F | 83.4 °F | 3.49 in. |
| August | 65.7 °F | 82.0 °F | 3.91 in. |
| September | 59.5 °F | 75.7 °F | 3.92 in. |
| October | 48.7 °F | 64.9 °F | 4.46 in. |
| November | 38.9 °F | 54.2 °F | 3.49 in. |
| December | 31.0 °F | 44.9 °F | 4.46 in. |
| Annual | 45.4 °F | 61.9 °F | 46.46 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| 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 | Dfa - Humid Continental Hot Summers With Year Around Precipitation |