Round Top, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 15.1 °C (high). Annual precipitation averages 1121.7 Millimeters. Round Top 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 | -9.2 °C | 0.8 °C | 79.25 mm |
| February | -8.4 °C | 2.5 °C | 65.02 mm |
| March | -4.1 °C | 7.1 °C | 87.88 mm |
| April | 1.9 °C | 14.9 °C | 91.44 mm |
| May | 7.7 °C | 21.3 °C | 87.88 mm |
| June | 12.8 °C | 25.8 °C | 107.7 mm |
| July | 15.5 °C | 28.3 °C | 92.71 mm |
| August | 14.6 °C | 27.3 °C | 100.84 mm |
| September | 10.4 °C | 23.3 °C | 103.89 mm |
| October | 4.4 °C | 16.4 °C | 125.48 mm |
| November | -0.8 °C | 9.5 °C | 84.07 mm |
| December | -5.4 °C | 3.6 °C | 95.5 mm |
| Annual | 3.3 °C | 15.1 °C | 1121.66 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |