Rockville, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.2 °C (low) to 24.9 °C (high). Annual precipitation averages 1535.2 Millimeters. Rockville is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.7 °C | 15.2 °C | 142.75 mm |
| February | 4.4 °C | 17.6 °C | 131.06 mm |
| March | 7.7 °C | 21.6 °C | 141.48 mm |
| April | 11.3 °C | 25.2 °C | 115.06 mm |
| May | 16.1 °C | 29.1 °C | 110.24 mm |
| June | 20.2 °C | 31.8 °C | 149.1 mm |
| July | 21.6 °C | 32.8 °C | 153.92 mm |
| August | 21.3 °C | 32.7 °C | 128.78 mm |
| September | 18.7 °C | 30.6 °C | 111 mm |
| October | 12.3 °C | 25.9 °C | 90.93 mm |
| November | 6.5 °C | 20.4 °C | 114.81 mm |
| December | 3.9 °C | 16.4 °C | 146.05 mm |
| Annual | 12.2 °C | 24.9 °C | 1535.18 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |