Setauket, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.5 °C (low) to 16.6 °C (high). Annual precipitation averages 1180.1 Millimeters. 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 | -4 °C | 4.2 °C | 92.2 mm |
| February | -3.4 °C | 5.2 °C | 80.01 mm |
| March | -0.1 °C | 9.2 °C | 108.46 mm |
| April | 5.1 °C | 15.6 °C | 103.38 mm |
| May | 10.5 °C | 21.1 °C | 93.22 mm |
| June | 15.8 °C | 25.6 °C | 100.08 mm |
| July | 19.2 °C | 28.6 °C | 88.65 mm |
| August | 18.7 °C | 27.8 °C | 99.31 mm |
| September | 15.3 °C | 24.3 °C | 99.57 mm |
| October | 9.3 °C | 18.3 °C | 113.28 mm |
| November | 3.8 °C | 12.3 °C | 88.65 mm |
| December | -0.6 °C | 7.2 °C | 113.28 mm |
| Annual | 7.5 °C | 16.6 °C | 1180.09 mm |
| 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 : -15°C to -12.2°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |