Swartz, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 53.3 °F (low) to 76.2 °F (high). Annual precipitation averages 57.9 Inches. Swartz 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 | 34.7 °F | 56.1 °F | 5.55 in. |
| February | 37.9 °F | 60.6 °F | 5.05 in. |
| March | 44.8 °F | 68.5 °F | 5.7 in. |
| April | 52.2 °F | 76.4 °F | 6.22 in. |
| May | 61.8 °F | 83.8 °F | 4.86 in. |
| June | 69.2 °F | 90.3 °F | 4.26 in. |
| July | 72.0 °F | 93.0 °F | 3.93 in. |
| August | 70.9 °F | 93.6 °F | 3.74 in. |
| September | 64.2 °F | 88.6 °F | 3.62 in. |
| October | 52.5 °F | 78.8 °F | 4.56 in. |
| November | 42.7 °F | 66.7 °F | 4.73 in. |
| December | 36.8 °F | 58.5 °F | 5.63 in. |
| Annual | 53.3 °F | 76.2 °F | 57.85 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 |