Clarendon, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 7.5 °C (low) to 23 °C (high). Annual precipitation averages 621.8 Millimeters. Clarendon is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.1 °C | 11.4 °C | 19.3 mm |
| February | -2.6 °C | 13.6 °C | 20.32 mm |
| March | 1.6 °C | 18.3 °C | 37.34 mm |
| April | 6.3 °C | 23.1 °C | 53.59 mm |
| May | 12 °C | 27.3 °C | 88.65 mm |
| June | 17.4 °C | 32 °C | 91.44 mm |
| July | 19.7 °C | 34.4 °C | 60.71 mm |
| August | 18.8 °C | 33.8 °C | 83.31 mm |
| September | 14.6 °C | 29.4 °C | 63.75 mm |
| October | 7.8 °C | 23.8 °C | 53.34 mm |
| November | 1.2 °C | 17.1 °C | 26.42 mm |
| December | -3.3 °C | 11.8 °C | 23.62 mm |
| Annual | 7.5 °C | 23 °C | 621.79 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |