Naper, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.4 °C (low) to 15.2 °C (high). Annual precipitation averages 661.2 Millimeters. Naper is located in USDA Plant Hardiness Zone 5a. 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 | -11.6 °C | 0 °C | 13.72 mm |
| February | -9.6 °C | 2.4 °C | 18.29 mm |
| March | -4.6 °C | 8.5 °C | 32.26 mm |
| April | 1.4 °C | 14.3 °C | 77.22 mm |
| May | 7.6 °C | 20.7 °C | 99.82 mm |
| June | 13.7 °C | 26.2 °C | 103.38 mm |
| July | 16.8 °C | 30.2 °C | 78.49 mm |
| August | 15.6 °C | 29 °C | 78.23 mm |
| September | 10.3 °C | 24.4 °C | 67.31 mm |
| October | 2.7 °C | 16.4 °C | 54.1 mm |
| November | -4.3 °C | 8.3 °C | 20.32 mm |
| December | -9.7 °C | 1.4 °C | 18.03 mm |
| Annual | 2.4 °C | 15.2 °C | 661.17 mm |
| Average First Frost Date | Oct. 1 - Oct. 10 |
| Average Last Frost Date | May 1 - May 10 |
| Average Days With Frost | 150-180 Days |
| Plant Hardiness Zone | Zone 5a : -28.9°C to -26.1°C |
| Plant Hardiness Zone - 2012 | Zone 5a : -28.9°C to -26.1°C |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |