Folsom, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.2 °C (low) to 25.8 °C (high). Annual precipitation averages 1684.8 Millimeters. Folsom is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 4.2 °C | 16.6 °C | 150.37 mm |
| February | 5.8 °C | 18.6 °C | 129.03 mm |
| March | 9.4 °C | 22.6 °C | 139.45 mm |
| April | 12.4 °C | 25.9 °C | 138.68 mm |
| May | 16.9 °C | 29.6 °C | 132.59 mm |
| June | 20.8 °C | 32.3 °C | 168.91 mm |
| July | 21.9 °C | 33.2 °C | 183.64 mm |
| August | 21.9 °C | 33.2 °C | 171.7 mm |
| September | 19.4 °C | 31.3 °C | 115.06 mm |
| October | 13.4 °C | 26.9 °C | 103.38 mm |
| November | 7.7 °C | 21.2 °C | 107.7 mm |
| December | 5.1 °C | 17.7 °C | 144.27 mm |
| Annual | 13.2 °C | 25.8 °C | 1684.78 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 10-20 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 | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |