Folsom, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 55.8 °F (low) to 78.4 °F (high). Annual precipitation averages 66.3 Inches. 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 | 39.5 °F | 61.8 °F | 5.92 in. |
| February | 42.5 °F | 65.5 °F | 5.08 in. |
| March | 48.9 °F | 72.7 °F | 5.49 in. |
| April | 54.3 °F | 78.6 °F | 5.46 in. |
| May | 62.4 °F | 85.2 °F | 5.22 in. |
| June | 69.4 °F | 90.2 °F | 6.65 in. |
| July | 71.4 °F | 91.8 °F | 7.23 in. |
| August | 71.4 °F | 91.8 °F | 6.76 in. |
| September | 67.0 °F | 88.3 °F | 4.53 in. |
| October | 56.1 °F | 80.5 °F | 4.07 in. |
| November | 45.9 °F | 70.1 °F | 4.24 in. |
| December | 41.1 °F | 63.9 °F | 5.68 in. |
| Annual | 55.8 °F | 78.4 °F | 66.33 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |