Rockdale, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 56.4 °F (low) to 78.9 °F (high). Annual precipitation averages 37 Inches. Rockdale is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 38.1 °F | 60.7 °F | 3.03 in. |
| February | 42.0 °F | 64.3 °F | 2.46 in. |
| March | 48.3 °F | 71.4 °F | 3.06 in. |
| April | 55.4 °F | 78.4 °F | 2.5 in. |
| May | 64.4 °F | 85.2 °F | 4.77 in. |
| June | 71.2 °F | 91.7 °F | 3.2 in. |
| July | 73.2 °F | 95.1 °F | 2.05 in. |
| August | 72.8 °F | 96.4 °F | 2.75 in. |
| September | 67.3 °F | 90.4 °F | 2.7 in. |
| October | 57.1 °F | 81.3 °F | 3.99 in. |
| November | 47.1 °F | 70.2 °F | 3.3 in. |
| December | 40.0 °F | 62.1 °F | 3.23 in. |
| Annual | 56.4 °F | 78.9 °F | 37.04 in. |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |