Melvin, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.8 °F (low) to 77.9 °F (high). Annual precipitation averages 26.3 Inches. Melvin is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 32.5 °F | 59.5 °F | 1.34 in. |
| February | 36.8 °F | 63.5 °F | 1.57 in. |
| March | 44.2 °F | 70.8 °F | 2.16 in. |
| April | 50.3 °F | 78.5 °F | 1.74 in. |
| May | 60.4 °F | 85.2 °F | 3.66 in. |
| June | 67.5 °F | 91.1 °F | 3.4 in. |
| July | 69.9 °F | 94.3 °F | 2.02 in. |
| August | 69.5 °F | 94.7 °F | 1.99 in. |
| September | 62.8 °F | 88.4 °F | 2.86 in. |
| October | 52.6 °F | 79.4 °F | 2.51 in. |
| November | 41.9 °F | 68.5 °F | 1.74 in. |
| December | 33.7 °F | 60.9 °F | 1.28 in. |
| Annual | 51.8 °F | 77.9 °F | 26.27 in. |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |