Retsof, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.8 °C (low) to 14.2 °C (high). Annual precipitation averages 872.8 Millimeters. Retsof 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 | -8.4 °C | 0.3 °C | 55.12 mm |
| February | -8.2 °C | 1.2 °C | 43.43 mm |
| March | -4.2 °C | 5.8 °C | 58.17 mm |
| April | 1.7 °C | 13.2 °C | 72.14 mm |
| May | 8.2 °C | 20.4 °C | 76.2 mm |
| June | 13.4 °C | 25 °C | 88.9 mm |
| July | 15.9 °C | 27.3 °C | 98.81 mm |
| August | 15 °C | 26.4 °C | 86.11 mm |
| September | 11.1 °C | 22.9 °C | 79.76 mm |
| October | 5.4 °C | 15.9 °C | 85.85 mm |
| November | 0.1 °C | 9 °C | 67.56 mm |
| December | -4.6 °C | 3.2 °C | 60.71 mm |
| Annual | 3.8 °C | 14.2 °C | 872.76 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 100-125 Days |
| Plant Hardiness Zone | Zone 6a : -23.3°C to -20.6°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |