Petty, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.4 °F (low) to 74.4 °F (high). Annual precipitation averages 45.1 Inches. Petty is located in USDA Plant Hardiness Zone 8a. 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 | 32.1 °F | 53.6 °F | 3.01 in. |
| February | 35.7 °F | 57.8 °F | 3.36 in. |
| March | 43.3 °F | 65.6 °F | 4.01 in. |
| April | 50.8 °F | 73.6 °F | 3.85 in. |
| May | 60.6 °F | 80.9 °F | 5.32 in. |
| June | 68.8 °F | 89.0 °F | 3.91 in. |
| July | 72.4 °F | 93.8 °F | 2.84 in. |
| August | 71.4 °F | 94.1 °F | 2.52 in. |
| September | 64.4 °F | 87.5 °F | 3.63 in. |
| October | 52.7 °F | 76.9 °F | 4.72 in. |
| November | 42.5 °F | 64.9 °F | 3.9 in. |
| December | 34.5 °F | 55.6 °F | 4.07 in. |
| Annual | 52.4 °F | 74.4 °F | 45.14 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 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 |