Valley Mills, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.4 °F (low) to 77.7 °F (high). Annual precipitation averages 37 Inches. Valley Mills 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 | 35.8 °F | 58.3 °F | 2.45 in. |
| February | 39.5 °F | 62.2 °F | 2.48 in. |
| March | 46.8 °F | 69.1 °F | 3.47 in. |
| April | 54.2 °F | 76.9 °F | 3.2 in. |
| May | 63.5 °F | 84.2 °F | 4.75 in. |
| June | 70.8 °F | 91.6 °F | 3.47 in. |
| July | 73.7 °F | 95.6 °F | 1.95 in. |
| August | 73.4 °F | 96.3 °F | 2.21 in. |
| September | 66.8 °F | 90.0 °F | 3.01 in. |
| October | 56.1 °F | 80.0 °F | 4.6 in. |
| November | 46.0 °F | 68.2 °F | 2.77 in. |
| December | 37.8 °F | 59.8 °F | 2.59 in. |
| Annual | 55.4 °F | 77.7 °F | 36.95 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |