Mason, Texas has a Humid Subtropical Climate climate (Köppen classification: Cfa). Average annual temperatures range from 11.2 °C (low) to 25.8 °C (high). Annual precipitation averages 720.4 Millimeters. 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 | 0.7 °C | 15.9 °C | 36.58 mm |
| February | 2.8 °C | 18 °C | 45.72 mm |
| March | 6.9 °C | 21.8 °C | 56.39 mm |
| April | 10.7 °C | 25.8 °C | 52.58 mm |
| May | 15.8 °C | 29.3 °C | 101.35 mm |
| June | 19.7 °C | 33.1 °C | 91.69 mm |
| July | 21 °C | 34.7 °C | 51.56 mm |
| August | 20.9 °C | 35.1 °C | 52.58 mm |
| September | 17.4 °C | 31.6 °C | 73.66 mm |
| October | 11.6 °C | 26.8 °C | 65.28 mm |
| November | 5.9 °C | 20.8 °C | 51.05 mm |
| December | 1.3 °C | 16.3 °C | 41.91 mm |
| Annual | 11.2 °C | 25.8 °C | 720.35 mm |
| 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 : -9.4°C to -6.7°C |
| Plant Hardiness Zone - 2012 | Zone 8a : -12.2°C to -9.4°C |
| Current Drought Conditions | Normal |
| Köppen Climate Classification | Cfa - Humid Subtropical Climate |