Houston, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.5 °C (low) to 26.2 °C (high). Annual precipitation averages 1415.6 Millimeters. Houston is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.2 °C | 17.2 °C | 106.43 mm |
| February | 9.2 °C | 19.1 °C | 80.01 mm |
| March | 12.8 °C | 22.3 °C | 98.55 mm |
| April | 16.3 °C | 25.7 °C | 106.17 mm |
| May | 20.4 °C | 29.4 °C | 132.84 mm |
| June | 23.7 °C | 32.7 °C | 147.32 mm |
| July | 24.7 °C | 33.8 °C | 108.71 mm |
| August | 24.6 °C | 34.2 °C | 140.72 mm |
| September | 22.2 °C | 31.7 °C | 138.18 mm |
| October | 17.2 °C | 27.7 °C | 129.54 mm |
| November | 11.7 °C | 22.1 °C | 117.86 mm |
| December | 8.3 °C | 18.2 °C | 109.22 mm |
| Annual | 16.5 °C | 26.2 °C | 1415.55 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 |