Fishers Island, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 46 °F (low) to 58.3 °F (high). Annual precipitation averages 46.8 Inches. Fishers Island is located in USDA Plant Hardiness Zone 7a. 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 | 26.1 °F | 38.9 °F | 3.8 in. |
| February | 26.9 °F | 39.5 °F | 3.22 in. |
| March | 32.2 °F | 45.8 °F | 4.77 in. |
| April | 41.1 °F | 54.6 °F | 4.36 in. |
| May | 49.5 °F | 61.9 °F | 3.5 in. |
| June | 59.1 °F | 70.9 °F | 3.66 in. |
| July | 66.3 °F | 77.7 °F | 3.03 in. |
| August | 66.2 °F | 76.6 °F | 3.71 in. |
| September | 60.4 °F | 72.1 °F | 3.88 in. |
| October | 50.5 °F | 62.7 °F | 4.49 in. |
| November | 41.0 °F | 53.6 °F | 3.79 in. |
| December | 32.5 °F | 44.8 °F | 4.56 in. |
| Annual | 46 °F | 58.3 °F | 46.77 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 7a : 0°F to 5°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |