League City, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.5 °C (low) to 25.9 °C (high). Annual precipitation averages 1503.2 Millimeters. League City is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °C | 17.2 °C | 118.62 mm |
| February | 9.2 °C | 19.1 °C | 78.99 mm |
| March | 12.7 °C | 22.1 °C | 84.33 mm |
| April | 16.2 °C | 25.4 °C | 114.05 mm |
| May | 20.4 °C | 29.1 °C | 129.03 mm |
| June | 23.6 °C | 32.1 °C | 151.38 mm |
| July | 24.5 °C | 33.2 °C | 115.06 mm |
| August | 24.3 °C | 33.6 °C | 165.35 mm |
| September | 22.1 °C | 31.3 °C | 161.8 mm |
| October | 17.4 °C | 27.4 °C | 143.51 mm |
| November | 11.8 °C | 22 °C | 124.71 mm |
| December | 8.1 °C | 18.3 °C | 116.33 mm |
| Annual | 16.5 °C | 25.9 °C | 1503.16 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 |