Megargel, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 24.9 °C (high). Annual precipitation averages 744.7 Millimeters. Megargel is located in USDA Plant Hardiness Zone 8a. 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 | -1.2 °C | 13.3 °C | 32.51 mm |
| February | 0.6 °C | 15.3 °C | 40.64 mm |
| March | 5.2 °C | 20.3 °C | 55.88 mm |
| April | 9.5 °C | 24.9 °C | 61.98 mm |
| May | 15.3 °C | 29.1 °C | 106.68 mm |
| June | 20.3 °C | 33.3 °C | 92.96 mm |
| July | 22.4 °C | 36.1 °C | 60.71 mm |
| August | 21.8 °C | 36.1 °C | 56.13 mm |
| September | 17.6 °C | 31.6 °C | 74.68 mm |
| October | 11.3 °C | 25.9 °C | 75.95 mm |
| November | 4.7 °C | 19.2 °C | 47.5 mm |
| December | -0.1 °C | 14.1 °C | 39.12 mm |
| Annual | 10.6 °C | 24.9 °C | 744.74 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 Days |
| Plant Hardiness Zone | Zone 8a : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |