Erath, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 58.5 °F (low) to 78 °F (high). Annual precipitation averages 63.7 Inches. Erath is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Jan. 21 - Jan. 31 through the first frost around Dec. 21 - Dec. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 42.0 °F | 61.7 °F | 5.79 in. |
| February | 45.5 °F | 65.2 °F | 4.23 in. |
| March | 51.6 °F | 71.7 °F | 3.78 in. |
| April | 58.1 °F | 77.7 °F | 5.18 in. |
| May | 66.1 °F | 84.3 °F | 4.88 in. |
| June | 72.1 °F | 89.2 °F | 6.93 in. |
| July | 74.2 °F | 90.7 °F | 6.74 in. |
| August | 73.0 °F | 91.1 °F | 6.83 in. |
| September | 68.9 °F | 88.1 °F | 5.52 in. |
| October | 58.6 °F | 80.9 °F | 4.79 in. |
| November | 48.8 °F | 71.1 °F | 4.62 in. |
| December | 43.6 °F | 63.9 °F | 4.44 in. |
| Annual | 58.5 °F | 78 °F | 63.73 in. |
| Average First Frost Date | Dec. 21 - Dec. 31 |
| Average Last Frost Date | Jan. 21 - Jan. 31 |
| Average Days With Frost | Frost Rare |
| 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 |