Petrolia, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 50.9 °F (low) to 75.6 °F (high). Annual precipitation averages 31.4 Inches. Petrolia 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 | 29.6 °F | 54.1 °F | 1.4 in. |
| February | 32.8 °F | 58.2 °F | 1.7 in. |
| March | 41.3 °F | 66.9 °F | 2.45 in. |
| April | 49.1 °F | 75.1 °F | 2.93 in. |
| May | 59.8 °F | 82.9 °F | 4.17 in. |
| June | 68.4 °F | 91.1 °F | 3.63 in. |
| July | 72.1 °F | 96.3 °F | 2.32 in. |
| August | 71.2 °F | 96.3 °F | 2.48 in. |
| September | 63.5 °F | 88.2 °F | 3.12 in. |
| October | 51.5 °F | 77.3 °F | 3.26 in. |
| November | 40.4 °F | 65.1 °F | 2.09 in. |
| December | 31.3 °F | 55.2 °F | 1.81 in. |
| Annual | 50.9 °F | 75.6 °F | 31.36 in. |
| 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 : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |