Rockville, Indiana has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 42.4 °F (low) to 63.1 °F (high). Annual precipitation averages 45.2 Inches. Rockville 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 | 19.4 °F | 35.4 °F | 3.07 in. |
| February | 22.2 °F | 40.2 °F | 2.58 in. |
| March | 31.3 °F | 51.4 °F | 3.34 in. |
| April | 41.6 °F | 64.5 °F | 4.69 in. |
| May | 52.2 °F | 74.7 °F | 4.94 in. |
| June | 61.3 °F | 83.2 °F | 5.09 in. |
| July | 64.3 °F | 85.8 °F | 4.47 in. |
| August | 62.0 °F | 84.5 °F | 3.55 in. |
| September | 54.3 °F | 79.1 °F | 3.2 in. |
| October | 43.2 °F | 67.0 °F | 3.69 in. |
| November | 33.1 °F | 51.9 °F | 3.66 in. |
| December | 24.3 °F | 39.9 °F | 2.93 in. |
| Annual | 42.4 °F | 63.1 °F | 45.21 in. |
| Average First Frost Date | Oct. 11 - Oct. 20 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 100-125 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 |