Loretto, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 47.8 °F (low) to 70.5 °F (high). Annual precipitation averages 60.3 Inches. Loretto is located in USDA Plant Hardiness Zone 7b. The growing season typically runs from the last frost around Apr. 1 - Apr. 10 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 28.7 °F | 49.2 °F | 5.26 in. |
| February | 31.6 °F | 53.6 °F | 5.59 in. |
| March | 38.4 °F | 62.3 °F | 5.97 in. |
| April | 46.5 °F | 71.5 °F | 5.61 in. |
| May | 56.0 °F | 78.7 °F | 5.1 in. |
| June | 63.8 °F | 85.4 °F | 4.62 in. |
| July | 67.4 °F | 88.5 °F | 4.94 in. |
| August | 65.9 °F | 88.2 °F | 4.23 in. |
| September | 59.3 °F | 83.3 °F | 4.29 in. |
| October | 47.2 °F | 72.9 °F | 4.19 in. |
| November | 36.8 °F | 61.1 °F | 4.16 in. |
| December | 31.4 °F | 51.8 °F | 6.3 in. |
| Annual | 47.8 °F | 70.5 °F | 60.26 in. |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 1 - Apr. 10 |
| 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 | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |