Mount Juliet, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.8 °F (low) to 69.7 °F (high). Annual precipitation averages 54.5 Inches. Mount Juliet is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Mar. 21 - Mar. 31 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 27.8 °F | 46.8 °F | 4.38 in. |
| February | 30.4 °F | 51.3 °F | 4.67 in. |
| March | 37.3 °F | 60.2 °F | 4.97 in. |
| April | 46.2 °F | 70.6 °F | 5.04 in. |
| May | 55.9 °F | 78.5 °F | 5.21 in. |
| June | 64.6 °F | 85.9 °F | 4.66 in. |
| July | 68.5 °F | 89.2 °F | 5.07 in. |
| August | 67.2 °F | 88.7 °F | 4.07 in. |
| September | 59.7 °F | 83.1 °F | 4.02 in. |
| October | 47.7 °F | 72.0 °F | 3.56 in. |
| November | 37.0 °F | 59.7 °F | 3.82 in. |
| December | 31.3 °F | 50.1 °F | 5.02 in. |
| Annual | 47.8 °F | 69.7 °F | 54.49 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 21 - Mar. 31 |
| Average Days With Frost | 50-75 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 | Moderate Drought |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |