Vernon, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.3 °C (low) to 24.5 °C (high). Annual precipitation averages 699 Millimeters. Vernon 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 | -1.8 °C | 12.3 °C | 27.18 mm |
| February | 0 °C | 14.4 °C | 31.5 mm |
| March | 4.5 °C | 19.3 °C | 53.34 mm |
| April | 8.9 °C | 24.3 °C | 57.66 mm |
| May | 15.2 °C | 29.2 °C | 105.66 mm |
| June | 20.4 °C | 33.8 °C | 88.14 mm |
| July | 22.4 °C | 36.2 °C | 62.23 mm |
| August | 21.9 °C | 36.1 °C | 59.18 mm |
| September | 17.7 °C | 31.4 °C | 73.66 mm |
| October | 10.9 °C | 25.5 °C | 65.53 mm |
| November | 4.3 °C | 18.5 °C | 40.89 mm |
| December | -0.8 °C | 12.8 °C | 34.04 mm |
| Annual | 10.3 °C | 24.5 °C | 699.01 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |