Cortland, New York has a Humid Continental Mild Summer, Wet All Year climate (Köppen classification: Dfb). Average annual temperatures range from 36.7 °F (low) to 56.1 °F (high). Annual precipitation averages 42.3 Inches. Cortland is located in USDA Plant Hardiness Zone 5b. 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 | 14.3 °F | 31.1 °F | 2.97 in. |
| February | 15.3 °F | 33.2 °F | 2.57 in. |
| March | 22.1 °F | 40.8 °F | 3.32 in. |
| April | 33.7 °F | 54.3 °F | 3.52 in. |
| May | 44.7 °F | 67.1 °F | 3.34 in. |
| June | 54.0 °F | 75.4 °F | 4.28 in. |
| July | 58.3 °F | 79.8 °F | 4.14 in. |
| August | 56.9 °F | 78.5 °F | 3.56 in. |
| September | 49.4 °F | 71.7 °F | 3.98 in. |
| October | 39.2 °F | 58.9 °F | 3.81 in. |
| November | 30.5 °F | 46.7 °F | 3.2 in. |
| December | 21.6 °F | 36.1 °F | 3.58 in. |
| Annual | 36.7 °F | 56.1 °F | 42.27 in. |
| 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 5b : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfb - Humid Continental Mild Summer, Wet All Year |