Mullin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.6 °C (low) to 25.2 °C (high). Annual precipitation averages 763 Millimeters. Mullin 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 | 0.8 °C | 14.9 °C | 42.67 mm |
| February | 3.1 °C | 17.2 °C | 52.07 mm |
| March | 7.2 °C | 20.9 °C | 68.58 mm |
| April | 10.9 °C | 25.3 °C | 59.44 mm |
| May | 16.1 °C | 28.9 °C | 101.6 mm |
| June | 20.3 °C | 32.7 °C | 99.06 mm |
| July | 21.7 °C | 34.7 °C | 45.97 mm |
| August | 21.6 °C | 34.9 °C | 55.88 mm |
| September | 18.1 °C | 31.3 °C | 68.33 mm |
| October | 11.9 °C | 26.2 °C | 74.93 mm |
| November | 6.2 °C | 19.9 °C | 54.61 mm |
| December | 1.7 °C | 15.4 °C | 39.88 mm |
| Annual | 11.6 °C | 25.2 °C | 763.02 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 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 |