Granger, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.5 °C (low) to 26 °C (high). Annual precipitation averages 909.8 Millimeters. Granger is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.2 °C | 15.7 °C | 66.55 mm |
| February | 5.3 °C | 17.8 °C | 52.07 mm |
| March | 9.1 °C | 21.7 °C | 76.71 mm |
| April | 12.9 °C | 25.8 °C | 68.58 mm |
| May | 17.9 °C | 29.6 °C | 119.13 mm |
| June | 21.6 °C | 33.2 °C | 86.61 mm |
| July | 22.8 °C | 35.1 °C | 57.15 mm |
| August | 22.7 °C | 35.7 °C | 65.79 mm |
| September | 19.6 °C | 32.4 °C | 76.2 mm |
| October | 14 °C | 27.3 °C | 92.96 mm |
| November | 8.4 °C | 21.1 °C | 73.15 mm |
| December | 4.2 °C | 16.5 °C | 74.93 mm |
| Annual | 13.5 °C | 26 °C | 909.83 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |