Mathews, Louisiana has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 60.2 °F (low) to 78.4 °F (high). Annual precipitation averages 65.6 Inches. Mathews is located in USDA Plant Hardiness Zone 9b.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 44.0 °F | 63.2 °F | 5.41 in. |
| February | 47.6 °F | 66.8 °F | 4.4 in. |
| March | 53.4 °F | 72.4 °F | 4.37 in. |
| April | 59.7 °F | 77.8 °F | 4.98 in. |
| May | 67.3 °F | 84.3 °F | 5.64 in. |
| June | 72.8 °F | 88.9 °F | 7.38 in. |
| July | 74.5 °F | 90.6 °F | 7.68 in. |
| August | 74.2 °F | 90.9 °F | 7.15 in. |
| September | 70.9 °F | 87.6 °F | 5.76 in. |
| October | 61.1 °F | 80.8 °F | 4.07 in. |
| November | 51.0 °F | 71.7 °F | 3.97 in. |
| December | 46.0 °F | 65.5 °F | 4.74 in. |
| Annual | 60.2 °F | 78.4 °F | 65.55 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Rare |
| Plant Hardiness Zone | Zone 9b : 25°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 9a : 20°F to 25°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |