Royal, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 2.6 °C (low) to 15.8 °C (high). Annual precipitation averages 721.4 Millimeters. Royal 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 | -11.2 °C | 0.4 °C | 15.24 mm |
| February | -9.4 °C | 2.9 °C | 22.61 mm |
| March | -4.2 °C | 9.1 °C | 40.39 mm |
| April | 1.7 °C | 15.6 °C | 82.8 mm |
| May | 8.1 °C | 21.6 °C | 106.93 mm |
| June | 14.2 °C | 27.3 °C | 104.39 mm |
| July | 16.9 °C | 30.1 °C | 78.99 mm |
| August | 15.6 °C | 28.8 °C | 95.25 mm |
| September | 10.3 °C | 25 °C | 63.5 mm |
| October | 2.9 °C | 17.6 °C | 62.48 mm |
| November | -4.2 °C | 8.9 °C | 27.94 mm |
| December | -9.4 °C | 1.9 °C | 20.83 mm |
| Annual | 2.6 °C | 15.8 °C | 721.35 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 5b : -26.1°C to -23.3°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 |