Fire Island, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 7.8 °C (low) to 15.5 °C (high). Annual precipitation averages 1210.6 Millimeters. Fire Island 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 Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -3.6 °C | 3.8 °C | 95.76 mm |
| February | -3.1 °C | 4.7 °C | 81.79 mm |
| March | 0.1 °C | 8.2 °C | 116.33 mm |
| April | 5.4 °C | 13.7 °C | 104.9 mm |
| May | 10.7 °C | 18.7 °C | 93.22 mm |
| June | 16.3 °C | 24.2 °C | 105.16 mm |
| July | 19.7 °C | 27.3 °C | 87.63 mm |
| August | 19.2 °C | 27.2 °C | 104.9 mm |
| September | 15.7 °C | 22.9 °C | 98.55 mm |
| October | 9.6 °C | 17.1 °C | 115.82 mm |
| November | 4.2 °C | 11.9 °C | 90.68 mm |
| December | -0.2 °C | 6.8 °C | 115.82 mm |
| Annual | 7.8 °C | 15.5 °C | 1210.56 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| 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 | Dfb - Humid Continental Mild Summer, Wet All Year |