Royal, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 36.7 °F (low) to 60.4 °F (high). Annual precipitation averages 28.4 Inches. 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 | 11.9 °F | 32.7 °F | 0.6 in. |
| February | 15.0 °F | 37.2 °F | 0.89 in. |
| March | 24.5 °F | 48.3 °F | 1.59 in. |
| April | 35.1 °F | 60.0 °F | 3.26 in. |
| May | 46.6 °F | 70.8 °F | 4.21 in. |
| June | 57.6 °F | 81.1 °F | 4.11 in. |
| July | 62.5 °F | 86.1 °F | 3.11 in. |
| August | 60.1 °F | 83.9 °F | 3.75 in. |
| September | 50.6 °F | 77.0 °F | 2.5 in. |
| October | 37.2 °F | 63.7 °F | 2.46 in. |
| November | 24.4 °F | 48.1 °F | 1.1 in. |
| December | 15.0 °F | 35.5 °F | 0.82 in. |
| Annual | 36.7 °F | 60.4 °F | 28.4 in. |
| 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 : -15°F to -10°F |
| Plant Hardiness Zone - 2012 | Zone 5a : -20°F to -15°F |
| Current Drought Conditions | Extreme Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |