Harrisonburg, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 54.4 °F (low) to 76.9 °F (high). Annual precipitation averages 61 Inches. Harrisonburg 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 | 36.8 °F | 57.9 °F | 5.67 in. |
| February | 39.5 °F | 62.2 °F | 5.48 in. |
| March | 46.5 °F | 69.8 °F | 5.44 in. |
| April | 53.7 °F | 76.7 °F | 5.9 in. |
| May | 62.3 °F | 84.2 °F | 4.94 in. |
| June | 69.2 °F | 90.2 °F | 5.03 in. |
| July | 71.7 °F | 92.6 °F | 4.96 in. |
| August | 70.8 °F | 92.9 °F | 4.59 in. |
| September | 65.2 °F | 88.1 °F | 3.98 in. |
| October | 53.9 °F | 80.1 °F | 4.48 in. |
| November | 44.2 °F | 68.3 °F | 4.97 in. |
| December | 38.6 °F | 60.1 °F | 5.57 in. |
| Annual | 54.4 °F | 76.9 °F | 61.01 in. |
| 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 : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8b : 15°F to 20°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |