Post, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 9.9 °C (low) to 24.6 °C (high). Annual precipitation averages 566.2 Millimeters. Post 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 | -1.3 °C | 13.7 °C | 18.8 mm |
| February | 0.3 °C | 15.8 °C | 24.64 mm |
| March | 4.6 °C | 20.4 °C | 28.19 mm |
| April | 8.8 °C | 25.3 °C | 44.45 mm |
| May | 14.4 °C | 29.4 °C | 79.76 mm |
| June | 19.2 °C | 33.4 °C | 78.99 mm |
| July | 21.3 °C | 34.7 °C | 60.71 mm |
| August | 20.7 °C | 34.5 °C | 58.42 mm |
| September | 16.7 °C | 30.2 °C | 68.33 mm |
| October | 10.4 °C | 25.1 °C | 44.45 mm |
| November | 4 °C | 18.7 °C | 33.53 mm |
| December | -0.6 °C | 13.8 °C | 25.91 mm |
| Annual | 9.9 °C | 24.6 °C | 566.18 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |