Bellaire, 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 1405.1 Millimeters. Bellaire is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.2 °C | 17.2 °C | 108.2 mm |
| February | 9.3 °C | 19.2 °C | 80.52 mm |
| March | 12.8 °C | 22.3 °C | 94.23 mm |
| April | 16.2 °C | 25.8 °C | 104.65 mm |
| May | 20.4 °C | 29.5 °C | 135.64 mm |
| June | 23.7 °C | 32.8 °C | 144.27 mm |
| July | 24.6 °C | 33.8 °C | 107.44 mm |
| August | 24.6 °C | 34.3 °C | 141.99 mm |
| September | 22.2 °C | 31.7 °C | 138.94 mm |
| October | 17.3 °C | 27.7 °C | 122.94 mm |
| November | 11.8 °C | 22.2 °C | 118.36 mm |
| December | 8.2 °C | 18.3 °C | 107.95 mm |
| Annual | 16.5 °C | 26.2 °C | 1405.13 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 |