Randolph, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.6 °C (low) to 14 °C (high). Annual precipitation averages 1175.3 Millimeters. Randolph 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 | -9.3 °C | -0.2 °C | 92.46 mm |
| February | -9.1 °C | 1.2 °C | 66.04 mm |
| March | -5.3 °C | 6.1 °C | 80.01 mm |
| April | 0.7 °C | 13.6 °C | 98.3 mm |
| May | 6.8 °C | 20.4 °C | 100.33 mm |
| June | 11.8 °C | 24.7 °C | 112.52 mm |
| July | 14.1 °C | 26.9 °C | 119.38 mm |
| August | 13.4 °C | 26.1 °C | 101.6 mm |
| September | 9.8 °C | 22.6 °C | 104.9 mm |
| October | 3.9 °C | 15.6 °C | 106.68 mm |
| November | -0.9 °C | 8.6 °C | 95.25 mm |
| December | -5.3 °C | 2.7 °C | 97.79 mm |
| Annual | 2.6 °C | 14 °C | 1175.26 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| 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 |