Poynor, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13 °C (low) to 25.1 °C (high). Annual precipitation averages 1151.6 Millimeters. Poynor 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 | 2.9 °C | 14.6 °C | 92.71 mm |
| February | 4.6 °C | 16.7 °C | 95.25 mm |
| March | 8.4 °C | 20.8 °C | 97.03 mm |
| April | 11.9 °C | 24.8 °C | 93.73 mm |
| May | 17.3 °C | 28.8 °C | 111.76 mm |
| June | 21.3 °C | 32.3 °C | 111.76 mm |
| July | 22.9 °C | 34.3 °C | 55.88 mm |
| August | 22.6 °C | 35 °C | 66.29 mm |
| September | 19.2 °C | 31.8 °C | 95.76 mm |
| October | 13.2 °C | 26.4 °C | 119.38 mm |
| November | 7.6 °C | 20.1 °C | 102.87 mm |
| December | 3.7 °C | 15.6 °C | 109.22 mm |
| Annual | 13 °C | 25.1 °C | 1151.64 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 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |