Friendswood, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 16.4 °C (low) to 26 °C (high). Annual precipitation averages 1453.9 Millimeters. Friendswood is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 7.1 °C | 17.2 °C | 115.82 mm |
| February | 9.1 °C | 19.1 °C | 80.52 mm |
| March | 12.7 °C | 22.2 °C | 86.61 mm |
| April | 16.2 °C | 25.6 °C | 112.01 mm |
| May | 20.4 °C | 29.3 °C | 126.75 mm |
| June | 23.6 °C | 32.3 °C | 139.45 mm |
| July | 24.5 °C | 33.3 °C | 116.84 mm |
| August | 24.4 °C | 33.8 °C | 151.38 mm |
| September | 22.2 °C | 31.5 °C | 146.3 mm |
| October | 17 °C | 27.6 °C | 141.99 mm |
| November | 11.7 °C | 22.2 °C | 120.9 mm |
| December | 8.2 °C | 18.3 °C | 115.32 mm |
| Annual | 16.4 °C | 26 °C | 1453.89 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 |