Richmond, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.5 °C (low) to 24.3 °C (high). Annual precipitation averages 1451.4 Millimeters. Richmond is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.3 °C | 13.3 °C | 142.75 mm |
| February | 4.1 °C | 15.8 °C | 128.27 mm |
| March | 8 °C | 20.2 °C | 136.65 mm |
| April | 12.3 °C | 24.5 °C | 163.07 mm |
| May | 17.3 °C | 28.6 °C | 123.19 mm |
| June | 21.1 °C | 31.9 °C | 104.65 mm |
| July | 22.5 °C | 33.3 °C | 102.62 mm |
| August | 21.9 °C | 33.4 °C | 93.98 mm |
| September | 18.4 °C | 30.9 °C | 87.38 mm |
| October | 12.1 °C | 25.9 °C | 99.82 mm |
| November | 6.5 °C | 19.4 °C | 122.17 mm |
| December | 3.4 °C | 14.7 °C | 146.81 mm |
| Annual | 12.5 °C | 24.3 °C | 1451.36 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |