Erwinville, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 57.5 °F (low) to 78.4 °F (high). Annual precipitation averages 63.5 Inches. Erwinville is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 11 - Feb. 20 through the first frost around Dec. 1 - Dec. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 40.8 °F | 61.7 °F | 6.47 in. |
| February | 44.2 °F | 65.7 °F | 5.03 in. |
| March | 50.4 °F | 72.5 °F | 4.59 in. |
| April | 56.6 °F | 78.5 °F | 5.23 in. |
| May | 64.8 °F | 85.2 °F | 5.68 in. |
| June | 71.2 °F | 90.0 °F | 6.45 in. |
| July | 73.1 °F | 91.4 °F | 5.43 in. |
| August | 72.6 °F | 91.9 °F | 5.88 in. |
| September | 68.3 °F | 88.3 °F | 4.59 in. |
| October | 57.5 °F | 80.6 °F | 4.66 in. |
| November | 47.6 °F | 70.6 °F | 4.27 in. |
| December | 42.5 °F | 63.8 °F | 5.25 in. |
| Annual | 57.5 °F | 78.4 °F | 63.53 in. |
| Average First Frost Date | Dec. 1 - Dec. 10 |
| Average Last Frost Date | Feb. 11 - Feb. 20 |
| Average Days With Frost | 10-20 Days |
| Plant Hardiness Zone | Zone 9a : 20°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |