Union Springs, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 4.6 °C (low) to 14.6 °C (high). Annual precipitation averages 974.1 Millimeters. Union Springs is located in USDA Plant Hardiness Zone 6b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -7.6 °C | 0.7 °C | 60.96 mm |
| February | -7.1 °C | 1.6 °C | 51.05 mm |
| March | -3.3 °C | 6.2 °C | 67.31 mm |
| April | 2.4 °C | 13.6 °C | 81.53 mm |
| May | 8.8 °C | 20.8 °C | 84.07 mm |
| June | 14.2 °C | 25.6 °C | 96.77 mm |
| July | 16.9 °C | 27.9 °C | 98.81 mm |
| August | 16.1 °C | 27.1 °C | 94.23 mm |
| September | 11.9 °C | 23.1 °C | 93.22 mm |
| October | 6.1 °C | 16 °C | 97.03 mm |
| November | 1 °C | 9.3 °C | 76.71 mm |
| December | -3.7 °C | 3.3 °C | 72.39 mm |
| Annual | 4.6 °C | 14.6 °C | 974.08 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 6b : -20.6°C to -17.8°C |
| Plant Hardiness Zone - 2012 | Zone 6a : -23.3°C to -20.6°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |