Bolton, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 1.5 °C (low) to 13.2 °C (high). Annual precipitation averages 1113.5 Millimeters. Bolton is located in USDA Plant Hardiness Zone 5a. The growing season typically runs from the last frost around May 11 - May 20 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -12.6 °C | -1.4 °C | 84.07 mm |
| February | -12.1 °C | 0.4 °C | 66.8 mm |
| March | -6.8 °C | 5.2 °C | 88.14 mm |
| April | 0.1 °C | 12.6 °C | 93.73 mm |
| May | 6.7 °C | 19.7 °C | 93.73 mm |
| June | 11.8 °C | 24.3 °C | 114.81 mm |
| July | 14.6 °C | 26.8 °C | 108.2 mm |
| August | 13.6 °C | 25.8 °C | 87.88 mm |
| September | 9.3 °C | 21.7 °C | 90.17 mm |
| October | 3.3 °C | 14.4 °C | 105.16 mm |
| November | -2.4 °C | 7.6 °C | 82.8 mm |
| December | -7.8 °C | 1.5 °C | 98.04 mm |
| Annual | 1.5 °C | 13.2 °C | 1113.53 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 11 - May 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |