Wharton, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.4 °C (low) to 26.7 °C (high). Annual precipitation averages 1187.2 Millimeters. Wharton is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.3 °C | 17.5 °C | 85.85 mm |
| February | 8.3 °C | 19.6 °C | 69.34 mm |
| March | 11.8 °C | 23.1 °C | 78.74 mm |
| April | 15.1 °C | 26.5 °C | 90.68 mm |
| May | 19.4 °C | 29.9 °C | 110.24 mm |
| June | 22.6 °C | 32.8 °C | 130.05 mm |
| July | 23.2 °C | 33.9 °C | 96.77 mm |
| August | 23.2 °C | 34.9 °C | 108.46 mm |
| September | 21 °C | 32.5 °C | 112.27 mm |
| October | 15.8 °C | 28.6 °C | 105.92 mm |
| November | 10.7 °C | 22.9 °C | 110.74 mm |
| December | 7.2 °C | 18.7 °C | 88.14 mm |
| Annual | 15.4 °C | 26.7 °C | 1187.2 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |