Cortland, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 40.7 °F (low) to 62.5 °F (high). Annual precipitation averages 31.1 Inches. Cortland is located in USDA Plant Hardiness Zone 6a. 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 | 14.8 °F | 35.0 °F | 0.73 in. |
| February | 19.3 °F | 39.1 °F | 0.93 in. |
| March | 28.5 °F | 51.2 °F | 1.75 in. |
| April | 39.4 °F | 62.5 °F | 2.74 in. |
| May | 50.5 °F | 72.6 °F | 5.51 in. |
| June | 61.5 °F | 83.0 °F | 4.5 in. |
| July | 65.4 °F | 86.7 °F | 3.95 in. |
| August | 63.6 °F | 85.7 °F | 3.24 in. |
| September | 54.5 °F | 78.5 °F | 2.91 in. |
| October | 41.9 °F | 66.3 °F | 2.37 in. |
| November | 29.1 °F | 50.9 °F | 1.39 in. |
| December | 19.4 °F | 38.7 °F | 1.12 in. |
| Annual | 40.7 °F | 62.5 °F | 31.14 in. |
| 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 6a : -10°F to -5°F |
| Plant Hardiness Zone - 2012 | Zone 5b : -15°F to -10°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |