Mason, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 52.2 °F (low) to 78.4 °F (high). Annual precipitation averages 28.4 Inches. Mason is located in USDA Plant Hardiness Zone 8b. The growing season typically runs from the last frost around Mar. 11 - Mar. 20 through the first frost around Nov. 1 - Nov. 10.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | 33.2 °F | 60.7 °F | 1.44 in. |
| February | 37.1 °F | 64.4 °F | 1.8 in. |
| March | 44.5 °F | 71.2 °F | 2.22 in. |
| April | 51.2 °F | 78.5 °F | 2.07 in. |
| May | 60.5 °F | 84.7 °F | 3.99 in. |
| June | 67.5 °F | 91.5 °F | 3.61 in. |
| July | 69.8 °F | 94.4 °F | 2.03 in. |
| August | 69.7 °F | 95.2 °F | 2.07 in. |
| September | 63.3 °F | 88.8 °F | 2.9 in. |
| October | 52.9 °F | 80.3 °F | 2.57 in. |
| November | 42.6 °F | 69.4 °F | 2.01 in. |
| December | 34.4 °F | 61.4 °F | 1.65 in. |
| Annual | 52.2 °F | 78.4 °F | 28.36 in. |
| Average First Frost Date | Nov. 1 - Nov. 10 |
| Average Last Frost Date | Mar. 11 - Mar. 20 |
| Average Days With Frost | 40-50 Days |
| Plant Hardiness Zone | Zone 8b : 15°F to 20°F |
| Plant Hardiness Zone - 2012 | Zone 8a : 10°F to 15°F |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |