Pecan Grove, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.8 °C (low) to 26.4 °C (high). Annual precipitation averages 1340.4 Millimeters. Pecan Grove is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.6 °C | 17.2 °C | 102.36 mm |
| February | 8.7 °C | 19.3 °C | 76.45 mm |
| March | 12.1 °C | 22.8 °C | 91.69 mm |
| April | 15.4 °C | 26.2 °C | 106.43 mm |
| May | 19.8 °C | 29.9 °C | 128.78 mm |
| June | 23.1 °C | 32.8 °C | 133.1 mm |
| July | 23.8 °C | 33.9 °C | 99.57 mm |
| August | 23.8 °C | 34.4 °C | 136.65 mm |
| September | 21.4 °C | 31.9 °C | 125.98 mm |
| October | 16.3 °C | 28 °C | 115.82 mm |
| November | 11 °C | 22.4 °C | 116.08 mm |
| December | 7.6 °C | 18.3 °C | 107.44 mm |
| Annual | 15.8 °C | 26.4 °C | 1340.35 mm |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| 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 |