Bombay, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 2.2 °C (low) to 12.4 °C (high). Annual precipitation averages 1008.9 Millimeters. Bombay is located in USDA Plant Hardiness Zone 5a. 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 | -13.3 °C | -3.8 °C | 71.37 mm |
| February | -12.3 °C | -2.3 °C | 57.91 mm |
| March | -6.4 °C | 3.2 °C | 63.5 mm |
| April | 1.2 °C | 11.7 °C | 84.33 mm |
| May | 7.9 °C | 19.5 °C | 85.6 mm |
| June | 13.3 °C | 24.4 °C | 102.62 mm |
| July | 15.9 °C | 26.9 °C | 98.81 mm |
| August | 14.8 °C | 26.1 °C | 90.17 mm |
| September | 10.4 °C | 21.9 °C | 93.73 mm |
| October | 4.5 °C | 14.3 °C | 104.39 mm |
| November | -1.4 °C | 7.2 °C | 78.99 mm |
| December | -8.1 °C | 0.1 °C | 77.47 mm |
| Annual | 2.2 °C | 12.4 °C | 1008.89 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 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 4b : -31.7°C to -28.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |