Mason, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 51.1 °F (low) to 71.2 °F (high). Annual precipitation averages 55.5 Inches. Mason is located in USDA Plant Hardiness Zone 8a. 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 | 30.8 °F | 48.3 °F | 4.15 in. |
| February | 34.0 °F | 53.2 °F | 4.71 in. |
| March | 41.3 °F | 62.1 °F | 5.56 in. |
| April | 50.3 °F | 71.9 °F | 5.6 in. |
| May | 60.1 °F | 80.1 °F | 5.57 in. |
| June | 68.0 °F | 87.5 °F | 4.45 in. |
| July | 71.3 °F | 90.3 °F | 4.31 in. |
| August | 69.5 °F | 89.7 °F | 3.28 in. |
| September | 62.2 °F | 84.2 °F | 3.82 in. |
| October | 50.9 °F | 73.9 °F | 3.97 in. |
| November | 40.7 °F | 61.4 °F | 4.52 in. |
| December | 33.5 °F | 51.3 °F | 5.58 in. |
| Annual | 51.1 °F | 71.2 °F | 55.52 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 8a : 10°F to 15°F |
| Plant Hardiness Zone - 2012 | Zone 7b : 5°F to 10°F |
| Current Drought Conditions | Abnormally Dry |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |