Mason, Tennessee has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 10.6 °C (low) to 21.8 °C (high). Annual precipitation averages 1410.2 Millimeters. 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 | -0.7 °C | 9.1 °C | 105.41 mm |
| February | 1.1 °C | 11.8 °C | 119.63 mm |
| March | 5.2 °C | 16.7 °C | 141.22 mm |
| April | 10.2 °C | 22.2 °C | 142.24 mm |
| May | 15.6 °C | 26.7 °C | 141.48 mm |
| June | 20 °C | 30.8 °C | 113.03 mm |
| July | 21.8 °C | 32.4 °C | 109.47 mm |
| August | 20.8 °C | 32.1 °C | 83.31 mm |
| September | 16.8 °C | 29 °C | 97.03 mm |
| October | 10.5 °C | 23.3 °C | 100.84 mm |
| November | 4.8 °C | 16.3 °C | 114.81 mm |
| December | 0.8 °C | 10.7 °C | 141.73 mm |
| Annual | 10.6 °C | 21.8 °C | 1410.2 mm |
| 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 : -12.2°C to -9.4°C |
| Plant Hardiness Zone - 2012 | Zone 7b : -15°C to -12.2°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |