Richmond, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 15.6 °C (low) to 26.5 °C (high). Annual precipitation averages 1331.7 Millimeters. Richmond is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 6.4 °C | 17.3 °C | 101.35 mm |
| February | 8.6 °C | 19.3 °C | 75.44 mm |
| March | 11.9 °C | 22.8 °C | 90.42 mm |
| April | 15.3 °C | 26.2 °C | 105.66 mm |
| May | 19.6 °C | 29.9 °C | 127.51 mm |
| June | 22.9 °C | 32.9 °C | 132.33 mm |
| July | 23.6 °C | 33.9 °C | 99.31 mm |
| August | 23.5 °C | 34.5 °C | 134.62 mm |
| September | 21.3 °C | 32.1 °C | 125.48 mm |
| October | 16.1 °C | 28.1 °C | 116.33 mm |
| November | 10.8 °C | 22.5 °C | 116.33 mm |
| December | 7.4 °C | 18.4 °C | 106.93 mm |
| Annual | 15.6 °C | 26.5 °C | 1331.71 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 |