December weather in Mason, TX
The average temperature in Mason in December is 49.3°F (35.6°F–63.0°F). Average precipitation: 1.38 inches.
December is a winter month in Mason, and is cooler than the annual average of 66°F. Daily temperatures swing about 27.4°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 10h 1m. For travel, December is cool.
Avg High
63.0°F
Avg Low
35.6°F
Precipitation
1.38 in
Daylight
10h 1m
December records in Mason
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 82.0°F (2019) | 19.0°F (1979) | 1.12 in (1968) |
| December 2 | 81.0°F (1982) | 18.0°F (1991) | 0.47 in (1965) |
| December 3 | 81.0°F (2012) | 19.9°F (1985) | 1.70 in (1965) |
| December 4 | 88.0°F (2005) | 18.0°F (2006) | 1.12 in (2011) |
| December 5 | 84.9°F (1977) | 16.0°F (1990) | 0.93 in (1943) |
| December 6 | 84.0°F (1972) | 18.0°F (1964) | 1.89 in (1960) |
| December 7 | 84.0°F (1966) | 19.9°F (2005) | 0.89 in (1960) |
| December 8 | 82.0°F (2023) | 18.0°F (2005) | 1.26 in (2018) |
| December 9 | 82.0°F (2021) | 12.9°F (2005) | 1.21 in (2002) |
| December 10 | 82.0°F (2021) | 12.0°F (1978) | 0.81 in (1998) |
| December 11 | 88.0°F (2021) | 12.9°F (1966) | 0.85 in (1946) |
| December 12 | 84.9°F (2015) | 12.9°F (1966) | 1.05 in (1999) |
| December 13 | 86.0°F (1973) | 14.0°F (1989) | 1.15 in (1984) |
| December 14 | 82.9°F (1995) | 15.1°F (1966) | 1.25 in (1992) |
| December 15 | 82.9°F (1973) | 12.0°F (1966) | 1.60 in (1959) |
| December 16 | 88.0°F (2019) | 10.9°F (1985) | 0.64 in (1959) |
| December 17 | 82.0°F (1977) | 12.0°F (1972) | 0.23 in (1959) |
| December 18 | 81.0°F (1996) | 9.0°F (1989) | 0.52 in (1986) |
| December 19 | 84.9°F (2012) | 16.0°F (1983) | 1.14 in (1952) |
| December 20 | 80.1°F (2012) | 16.0°F (1989) | 0.14 in (1942) |
| December 21 | 88.0°F (2025) | 12.0°F (1973) | 0.87 in (2013) |
| December 22 | 87.1°F (2010) | 5.0°F (1989) | 0.80 in (1993) |
| December 23 | 80.1°F (1964) | 9.0°F (1983) | 0.60 in (1986) |
| December 24 | 82.9°F (2021) | 6.1°F (1990) | 0.88 in (1979) |
| December 25 | 84.9°F (2021) | 6.1°F (1983) | 0.75 in (2000) |
| December 26 | 84.9°F (2021) | 14.0°F (1983) | 0.73 in (1974) |
| December 27 | 88.0°F (2021) | 18.0°F (2004) | 0.95 in (2018) |
| December 28 | 82.9°F (2005) | 18.0°F (1967) | 2.80 in (1994) |
| December 29 | 84.0°F (2025) | 9.0°F (1983) | 1.19 in (2019) |
| December 30 | 84.0°F (2024) | 3.0°F (1983) | 1.98 in (1952) |
| December 31 | 87.1°F (2024) | 12.0°F (1983) | 1.05 in (2020) |