Ithaca, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 3.3 °C (low) to 15.1 °C (high). Annual precipitation averages 863.3 Millimeters. Ithaca is located in USDA Plant Hardiness Zone 6b. 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 | -8.2 °C | 1 °C | 49.53 mm |
| February | -7.8 °C | 2.3 °C | 48.51 mm |
| March | -3.8 °C | 6.7 °C | 65.28 mm |
| April | 1.4 °C | 14.3 °C | 80.77 mm |
| May | 7.7 °C | 21.4 °C | 69.85 mm |
| June | 12.1 °C | 25.9 °C | 85.34 mm |
| July | 14.5 °C | 28.2 °C | 89.66 mm |
| August | 13.9 °C | 27.6 °C | 86.36 mm |
| September | 10.1 °C | 23.7 °C | 84.84 mm |
| October | 4.2 °C | 16.6 °C | 85.6 mm |
| November | -0.4 °C | 9.9 °C | 61.72 mm |
| December | -4.6 °C | 3.9 °C | 55.88 mm |
| Annual | 3.3 °C | 15.1 °C | 863.34 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 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 |