Endwell, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.9 °C (low) to 14.2 °C (high). Annual precipitation averages 1030.2 Millimeters. Endwell is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.2 °C | -0.1 °C | 67.56 mm |
| February | -8.8 °C | 1.3 °C | 54.1 mm |
| March | -4.9 °C | 6.1 °C | 79.5 mm |
| April | 1.1 °C | 13.6 °C | 89.92 mm |
| May | 7.3 °C | 20.4 °C | 87.12 mm |
| June | 12.4 °C | 25.1 °C | 106.93 mm |
| July | 14.9 °C | 27.1 °C | 102.11 mm |
| August | 14.2 °C | 26.7 °C | 104.39 mm |
| September | 10.2 °C | 22.7 °C | 100.58 mm |
| October | 4.2 °C | 15.8 °C | 94.23 mm |
| November | -1.1 °C | 8.6 °C | 71.63 mm |
| December | -5.3 °C | 2.8 °C | 72.14 mm |
| Annual | 2.9 °C | 14.2 °C | 1030.21 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 5b : -26.1°C to -23.3°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |