Rotan, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 25.2 °C (high). Annual precipitation averages 576.3 Millimeters. Rotan 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. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -0.9 °C | 13.9 °C | 24.38 mm |
| February | 0.9 °C | 16.2 °C | 32.77 mm |
| March | 5.2 °C | 20.9 °C | 39.88 mm |
| April | 9.6 °C | 26 °C | 42.93 mm |
| May | 15.3 °C | 30 °C | 77.22 mm |
| June | 20.1 °C | 33.9 °C | 78.23 mm |
| July | 21.9 °C | 35.6 °C | 42.93 mm |
| August | 21.3 °C | 35.3 °C | 57.91 mm |
| September | 17.2 °C | 30.8 °C | 64.52 mm |
| October | 11.1 °C | 26 °C | 51.56 mm |
| November | 4.7 °C | 19.3 °C | 34.8 mm |
| December | 0.2 °C | 14.3 °C | 29.21 mm |
| Annual | 10.6 °C | 25.2 °C | 576.34 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |