Retreat, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.9 °C (low) to 25.1 °C (high). Annual precipitation averages 1063 Millimeters. Retreat is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.2 °C | 14.2 °C | 79.25 mm |
| February | 4.2 °C | 16.6 °C | 82.04 mm |
| March | 8.2 °C | 20.4 °C | 98.81 mm |
| April | 12.1 °C | 24.5 °C | 97.03 mm |
| May | 17.4 °C | 28.5 °C | 109.73 mm |
| June | 21.6 °C | 32.6 °C | 99.82 mm |
| July | 23.1 °C | 34.9 °C | 51.56 mm |
| August | 22.9 °C | 35.4 °C | 62.99 mm |
| September | 19.2 °C | 32.1 °C | 78.99 mm |
| October | 13.2 °C | 26.3 °C | 128.27 mm |
| November | 7.6 °C | 19.9 °C | 82.8 mm |
| December | 3.3 °C | 15.3 °C | 91.69 mm |
| Annual | 12.9 °C | 25.1 °C | 1062.98 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |