Robert Lee, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.9 °F (low) to 79 °F (high). Annual precipitation averages 21.3 Inches. Robert Lee 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 | 31.6 °F | 59.4 °F | 0.93 in. |
| February | 35.5 °F | 63.9 °F | 1.21 in. |
| March | 43.2 °F | 71.3 °F | 1.46 in. |
| April | 50.6 °F | 80.6 °F | 1.42 in. |
| May | 60.7 °F | 87.8 °F | 2.67 in. |
| June | 68.8 °F | 93.9 °F | 2.54 in. |
| July | 71.6 °F | 96.9 °F | 1.51 in. |
| August | 71.0 °F | 96.1 °F | 2.39 in. |
| September | 63.6 °F | 88.7 °F | 2.46 in. |
| October | 52.5 °F | 79.7 °F | 2.24 in. |
| November | 41.2 °F | 68.5 °F | 1.54 in. |
| December | 33.0 °F | 60.6 °F | 0.88 in. |
| Annual | 51.9 °F | 79 °F | 21.25 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |