Johnson City, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 12.4 °C (low) to 25.7 °C (high). Annual precipitation averages 845.6 Millimeters. Johnson City is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 11 - Nov. 20.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 2.1 °C | 16 °C | 53.59 mm |
| February | 4.3 °C | 17.9 °C | 50.04 mm |
| March | 8.1 °C | 21.8 °C | 64.52 mm |
| April | 11.9 °C | 25.7 °C | 60.45 mm |
| May | 17.1 °C | 29.1 °C | 113.79 mm |
| June | 20.7 °C | 32.7 °C | 75.95 mm |
| July | 21.8 °C | 34.4 °C | 56.64 mm |
| August | 21.7 °C | 35.1 °C | 55.37 mm |
| September | 18.4 °C | 31.6 °C | 93.98 mm |
| October | 12.7 °C | 26.9 °C | 91.69 mm |
| November | 7.4 °C | 20.8 °C | 74.68 mm |
| December | 2.9 °C | 16.7 °C | 54.86 mm |
| Annual | 12.4 °C | 25.7 °C | 845.56 mm |
| Average First Frost Date | Nov. 11 - Nov. 20 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 30-40 Days |
| Plant Hardiness Zone | Zone 8b : -9.4°C to -6.7°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 |