Los Fresnos, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 65.4 °F (low) to 84.1 °F (high). Annual precipitation averages 28.4 Inches. Los Fresnos is located in USDA Plant Hardiness Zone 10a.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 50.9 °F | 70.3 °F | 1.29 in. |
| February | 54.7 °F | 74.4 °F | 1.4 in. |
| March | 60.0 °F | 79.3 °F | 1.4 in. |
| April | 66.0 °F | 84.4 °F | 1.52 in. |
| May | 72.0 °F | 89.2 °F | 2.25 in. |
| June | 75.8 °F | 93.3 °F | 2.64 in. |
| July | 76.5 °F | 94.3 °F | 2.72 in. |
| August | 76.7 °F | 95.6 °F | 1.84 in. |
| September | 73.5 °F | 91.3 °F | 5.73 in. |
| October | 67.4 °F | 86.5 °F | 3.93 in. |
| November | 58.8 °F | 78.3 °F | 1.92 in. |
| December | 52.2 °F | 71.7 °F | 1.71 in. |
| Annual | 65.4 °F | 84.1 °F | 28.35 in. |
| Average First Frost Date | Frost Rare |
| Average Last Frost Date | |
| Average Days With Frost | Frost Free |
| Plant Hardiness Zone | Zone 10a : 30°F to 25°F |
| Plant Hardiness Zone - 2012 | Zone 10a : 30°F to 25°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |