Old River-Winfree, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.3 °C (low) to 25.9 °C (high). Annual precipitation averages 1518.2 Millimeters. Old River-Winfree is located in USDA Plant Hardiness Zone 9b. The growing season typically runs from the last frost around Frost Rare through the first frost around Jan. 1 - Jan. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.8 °C | 17.1 °C | 120.4 mm |
| February | 8.8 °C | 18.9 °C | 90.17 mm |
| March | 12.4 °C | 22.1 °C | 96.52 mm |
| April | 16 °C | 25.4 °C | 108.2 mm |
| May | 20.2 °C | 29 °C | 140.21 mm |
| June | 23.5 °C | 32.1 °C | 147.32 mm |
| July | 24.5 °C | 33.2 °C | 124.46 mm |
| August | 24.3 °C | 33.7 °C | 159.26 mm |
| September | 21.9 °C | 31.4 °C | 150.62 mm |
| October | 17.2 °C | 27.3 °C | 145.03 mm |
| November | 11.6 °C | 21.9 °C | 117.09 mm |
| December | 7.8 °C | 18.1 °C | 118.87 mm |
| Annual | 16.3 °C | 25.9 °C | 1518.15 mm |
| Average First Frost Date | Jan. 1 - Jan. 10 |
| Average Last Frost Date | Frost Rare |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : -3.9°C to -1.1°C |
| Plant Hardiness Zone - 2012 | Zone 9a : -6.7°C to -3.9°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |