Constantia, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.1 °C (low) to 13.8 °C (high). Annual precipitation averages 1177.6 Millimeters. Constantia is located in USDA Plant Hardiness Zone 5b. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 11 - Oct. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -9.9 °C | -0.7 °C | 109.73 mm |
| February | -9.4 °C | 0.6 °C | 76.71 mm |
| March | -5.1 °C | 4.9 °C | 83.06 mm |
| April | 1.2 °C | 13.2 °C | 86.87 mm |
| May | 7.7 °C | 20.3 °C | 95 mm |
| June | 12.7 °C | 24.8 °C | 107.19 mm |
| July | 15.3 °C | 27.3 °C | 97.79 mm |
| August | 14.4 °C | 26.5 °C | 101.35 mm |
| September | 10.4 °C | 22.7 °C | 98.04 mm |
| October | 4.9 °C | 15.4 °C | 128.52 mm |
| November | -0.1 °C | 8.6 °C | 95.25 mm |
| December | -5.4 °C | 2.4 °C | 98.04 mm |
| Annual | 3.1 °C | 13.8 °C | 1177.55 mm |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 125-150 Days |
| Plant Hardiness Zone | Zone 5b : -26.1°C to -23.3°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 |