Clarks, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12 °C (low) to 25 °C (high). Annual precipitation averages 1493.5 Millimeters. Clarks is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 14.3 °C | 147.32 mm |
| February | 3.6 °C | 16.6 °C | 130.05 mm |
| March | 7.4 °C | 21.1 °C | 137.41 mm |
| April | 11.4 °C | 25 °C | 151.38 mm |
| May | 16.4 °C | 29.1 °C | 123.95 mm |
| June | 20.4 °C | 32.3 °C | 118.62 mm |
| July | 21.9 °C | 33.8 °C | 111.25 mm |
| August | 21.3 °C | 34.2 °C | 93.47 mm |
| September | 18.1 °C | 31.5 °C | 94.49 mm |
| October | 11.7 °C | 26.3 °C | 112.01 mm |
| November | 6.3 °C | 20 °C | 128.78 mm |
| December | 3 °C | 15.4 °C | 144.78 mm |
| Annual | 12 °C | 25 °C | 1493.51 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| 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 |