Rockville, Nebraska has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 38 °F (low) to 62.3 °F (high). Annual precipitation averages 26.8 Inches. Rockville 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 | 13.6 °F | 35.7 °F | 0.52 in. |
| February | 16.8 °F | 39.5 °F | 0.65 in. |
| March | 26.2 °F | 51.4 °F | 1.61 in. |
| April | 36.4 °F | 62.3 °F | 2.91 in. |
| May | 47.6 °F | 72.1 °F | 4.26 in. |
| June | 58.8 °F | 82.5 °F | 4.08 in. |
| July | 63.7 °F | 86.9 °F | 3.44 in. |
| August | 61.3 °F | 84.7 °F | 3.31 in. |
| September | 51.4 °F | 78.1 °F | 2.1 in. |
| October | 37.9 °F | 65.2 °F | 2.07 in. |
| November | 25.5 °F | 50.6 °F | 1.03 in. |
| December | 16.5 °F | 38.4 °F | 0.8 in. |
| Annual | 38 °F | 62.3 °F | 26.78 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 | Moderate Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |