Petronila, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 62.9 °F (low) to 82.2 °F (high). Annual precipitation averages 30 Inches. Petronila is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 46.6 °F | 67.3 °F | 1.49 in. |
| February | 50.6 °F | 71.5 °F | 1.49 in. |
| March | 57.0 °F | 76.4 °F | 2.1 in. |
| April | 63.1 °F | 82.3 °F | 1.71 in. |
| May | 70.3 °F | 87.2 °F | 3.05 in. |
| June | 74.8 °F | 92.0 °F | 3.1 in. |
| July | 75.7 °F | 93.9 °F | 2.63 in. |
| August | 75.9 °F | 95.1 °F | 2.61 in. |
| September | 72.6 °F | 90.8 °F | 5.18 in. |
| October | 64.6 °F | 85.1 °F | 3.17 in. |
| November | 55.4 °F | 76.0 °F | 1.82 in. |
| December | 48.6 °F | 69.3 °F | 1.63 in. |
| Annual | 62.9 °F | 82.2 °F | 29.98 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9b : 25°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |