Mongaup Valley, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.7 °C (low) to 14.2 °C (high). Annual precipitation averages 1164.9 Millimeters. Mongaup Valley is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around May 1 - May 10 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.7 °C | 0.1 °C | 81.28 mm |
| February | -9 °C | 1.8 °C | 60.2 mm |
| March | -4.6 °C | 6.5 °C | 85.34 mm |
| April | 1.3 °C | 13.9 °C | 92.71 mm |
| May | 7.1 °C | 20.2 °C | 100.58 mm |
| June | 12.3 °C | 24.7 °C | 128.02 mm |
| July | 14.8 °C | 27.3 °C | 110.24 mm |
| August | 13.9 °C | 26.3 °C | 107.19 mm |
| September | 10 °C | 22.4 °C | 114.81 mm |
| October | 3.8 °C | 15.7 °C | 106.68 mm |
| November | -1.4 °C | 8.9 °C | 81.53 mm |
| December | -5.9 °C | 2.8 °C | 96.27 mm |
| Annual | 2.7 °C | 14.2 °C | 1164.85 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 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 |