Johnson City, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 45.5 °F (low) to 68 °F (high). Annual precipitation averages 45.4 Inches. Johnson City is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 26.8 °F | 46.5 °F | 3.47 in. |
| February | 29.3 °F | 50.6 °F | 3.77 in. |
| March | 35.7 °F | 59.4 °F | 4.1 in. |
| April | 43.9 °F | 69.5 °F | 4.08 in. |
| May | 53.0 °F | 76.8 °F | 4.0 in. |
| June | 60.9 °F | 82.9 °F | 3.92 in. |
| July | 64.7 °F | 85.6 °F | 4.99 in. |
| August | 63.5 °F | 85.0 °F | 4.58 in. |
| September | 57.4 °F | 80.4 °F | 2.85 in. |
| October | 45.6 °F | 70.5 °F | 2.6 in. |
| November | 35.2 °F | 59.1 °F | 2.91 in. |
| December | 29.8 °F | 49.7 °F | 4.1 in. |
| Annual | 45.5 °F | 68 °F | 45.37 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7b : 5°F to 10°F |
| Plant Hardiness Zone - 2012 | Zone 7a : 0°F to 5°F |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |