Mountain City, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 13.4 °C (low) to 26 °C (high). Annual precipitation averages 946.7 Millimeters. Mountain City is located in USDA Plant Hardiness Zone 9a. The growing season typically runs from the last frost around Feb. 21 - Feb. 29 through the first frost around Nov. 21 - Nov. 30.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 3.3 °C | 16.3 °C | 63.75 mm |
| February | 5.5 °C | 18.3 °C | 50.55 mm |
| March | 9.2 °C | 21.9 °C | 74.93 mm |
| April | 12.9 °C | 25.7 °C | 72.39 mm |
| May | 17.9 °C | 29.3 °C | 129.03 mm |
| June | 21.4 °C | 32.7 °C | 90.68 mm |
| July | 22.4 °C | 34.6 °C | 57.91 mm |
| August | 22.3 °C | 35.4 °C | 65.02 mm |
| September | 19.3 °C | 32.1 °C | 91.19 mm |
| October | 13.9 °C | 27.3 °C | 107.95 mm |
| November | 8.3 °C | 21.3 °C | 73.91 mm |
| December | 4.2 °C | 17 °C | 69.34 mm |
| Annual | 13.4 °C | 26 °C | 946.65 mm |
| Average First Frost Date | Nov. 21 - Nov. 30 |
| Average Last Frost Date | Feb. 21 - Feb. 29 |
| Average Days With Frost | 20-30 Days |
| Plant Hardiness Zone | Zone 9a : -6.7°C to -3.9°C |
| Plant Hardiness Zone - 2012 | Zone 8b : -9.4°C to -6.7°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |