Rock Mills, Alabama has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 23.5 °C (high). Annual precipitation averages 1391.7 Millimeters. Rock Mills is located in USDA Plant Hardiness Zone 8a. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.1 °C | 13 °C | 137.41 mm |
| February | 1.6 °C | 15.3 °C | 136.14 mm |
| March | 5 °C | 19.6 °C | 131.83 mm |
| April | 8.7 °C | 24.1 °C | 115.82 mm |
| May | 13.8 °C | 27.9 °C | 102.11 mm |
| June | 18.2 °C | 31.1 °C | 119.89 mm |
| July | 20.2 °C | 32.6 °C | 130.05 mm |
| August | 19.8 °C | 32.1 °C | 105.92 mm |
| September | 16.5 °C | 29.4 °C | 92.71 mm |
| October | 9.9 °C | 24.4 °C | 81.28 mm |
| November | 4.2 °C | 18.7 °C | 105.92 mm |
| December | 1.4 °C | 14.3 °C | 132.59 mm |
| Annual | 9.9 °C | 23.5 °C | 1391.67 mm |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |