Cairo, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.9 °C (low) to 15.4 °C (high). Annual precipitation averages 1066 Millimeters. Cairo is located in USDA Plant Hardiness Zone 6a. The growing season typically runs from the last frost around Apr. 21 - Apr. 30 through the first frost around Oct. 1 - Oct. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -8.7 °C | 1.1 °C | 71.63 mm |
| February | -7.7 °C | 2.8 °C | 61.47 mm |
| March | -3.4 °C | 7.6 °C | 80.77 mm |
| April | 2.6 °C | 15.4 °C | 87.38 mm |
| May | 8.4 °C | 21.7 °C | 82.8 mm |
| June | 13.5 °C | 26.2 °C | 103.38 mm |
| July | 16.2 °C | 28.7 °C | 89.15 mm |
| August | 15.3 °C | 27.6 °C | 98.81 mm |
| September | 11.1 °C | 23.7 °C | 99.31 mm |
| October | 4.9 °C | 16.7 °C | 123.19 mm |
| November | -0.3 °C | 9.8 °C | 75.44 mm |
| December | -4.8 °C | 3.7 °C | 92.71 mm |
| Annual | 3.9 °C | 15.4 °C | 1066.04 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | Apr. 21 - Apr. 30 |
| Average Days With Frost | 150-180 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 | Abnormally Dry |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |