Richwood, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.6 °F (low) to 76.5 °F (high). Annual precipitation averages 56.9 Inches. Richwood 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 | 35.0 °F | 56.2 °F | 5.47 in. |
| February | 37.9 °F | 60.7 °F | 5.02 in. |
| March | 45.1 °F | 68.6 °F | 5.54 in. |
| April | 52.5 °F | 76.7 °F | 6.0 in. |
| May | 62.1 °F | 84.1 °F | 4.9 in. |
| June | 69.4 °F | 90.5 °F | 4.38 in. |
| July | 72.3 °F | 93.1 °F | 4.16 in. |
| August | 71.1 °F | 93.9 °F | 3.49 in. |
| September | 64.6 °F | 89.1 °F | 3.49 in. |
| October | 53.0 °F | 79.1 °F | 4.33 in. |
| November | 43.2 °F | 67.1 °F | 4.69 in. |
| December | 37.1 °F | 58.8 °F | 5.46 in. |
| Annual | 53.6 °F | 76.5 °F | 56.93 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |