Smithtown, New York has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7.2 °C (low) to 16.4 °C (high). Annual precipitation averages 1279.4 Millimeters. Smithtown is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.3 °C | 4.1 °C | 98.81 mm |
| February | -3.7 °C | 5.1 °C | 88.39 mm |
| March | -0.2 °C | 8.8 °C | 124.21 mm |
| April | 5 °C | 15.2 °C | 110.49 mm |
| May | 10.4 °C | 20.7 °C | 99.57 mm |
| June | 15.9 °C | 25.5 °C | 110.49 mm |
| July | 19.2 °C | 28.5 °C | 87.12 mm |
| August | 18.6 °C | 27.6 °C | 107.44 mm |
| September | 14.8 °C | 23.9 °C | 103.89 mm |
| October | 8.8 °C | 17.7 °C | 125.73 mm |
| November | 3.1 °C | 12.1 °C | 95.5 mm |
| December | -1.1 °C | 7.1 °C | 127.76 mm |
| Annual | 7.2 °C | 16.4 °C | 1279.4 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| 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 | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |