East Mountain, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.3 °C (low) to 24.6 °C (high). Annual precipitation averages 1233.4 Millimeters. East Mountain is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 1 - Mar. 10 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 1.9 °C | 13.8 °C | 97.28 mm |
| February | 3.8 °C | 16.1 °C | 102.36 mm |
| March | 7.6 °C | 20.4 °C | 118.62 mm |
| April | 11.5 °C | 24.6 °C | 113.03 mm |
| May | 16.8 °C | 28.4 °C | 120.9 mm |
| June | 20.9 °C | 32.3 °C | 109.98 mm |
| July | 22.6 °C | 34.2 °C | 73.91 mm |
| August | 22.1 °C | 34.4 °C | 72.9 mm |
| September | 18.6 °C | 31.3 °C | 95.25 mm |
| October | 12.3 °C | 25.7 °C | 113.79 mm |
| November | 6.8 °C | 19.4 °C | 99.06 mm |
| December | 2.9 °C | 14.7 °C | 116.33 mm |
| Annual | 12.3 °C | 24.6 °C | 1233.41 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 1 - Mar. 10 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |