December weather in Mercedes, TX
The average temperature in Mercedes in December is 61.8°F (51.6°F–72.0°F). Average precipitation: 1.25 inches.
December is a winter month in Mercedes, and is cooler than the annual average of 75°F. Daily temperatures swing about 20.4°F between overnight low and afternoon high. Daylight averages about 10h 22m. For travel, December is one of the best months of the year to visit.
Avg High
72.0°F
Avg Low
51.6°F
Precipitation
1.25 in
Daylight
10h 22m
December records in Mercedes
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 90.0°F (1921) | 28.0°F (1957) | 2.38 in (2009) |
| December 2 | 89.1°F (1942) | 32.0°F (1918) | 1.15 in (2000) |
| December 3 | 90.0°F (1978) | 30.0°F (1918) | 1.56 in (1989) |
| December 4 | 90.0°F (1942) | 30.9°F (1918) | 0.97 in (1965) |
| December 5 | 105.1°F (1925) | 28.0°F (1945) | 1.07 in (1937) |
| December 6 | 90.0°F (1924) | 30.0°F (1945) | 0.72 in (1931) |
| December 7 | 91.0°F (1917) | 24.1°F (1950) | 0.59 in (1931) |
| December 8 | 89.1°F (1919) | 34.0°F (2011) | 0.63 in (1964) |
| December 9 | 90.0°F (1996) | 28.9°F (1917) | 0.53 in (1964) |
| December 10 | 90.0°F (2008) | 27.0°F (1978) | 0.40 in (1947) |
| December 11 | 93.9°F (1939) | 26.1°F (1944) | 1.49 in (1935) |
| December 12 | 91.0°F (1939) | 26.1°F (1957) | 0.50 in (1936) |
| December 13 | 88.0°F (1919) | 28.9°F (1989) | 1.27 in (1936) |
| December 14 | 88.0°F (2022) | 28.9°F (1997) | 0.88 in (1960) |
| December 15 | 90.0°F (1921) | 30.9°F (1938) | 0.74 in (1940) |
| December 16 | 89.1°F (1915) | 28.0°F (1958) | 0.79 in (2009) |
| December 17 | 87.1°F (1933) | 30.0°F (1989) | 1.64 in (2009) |
| December 18 | 87.1°F (1990) | 28.9°F (1932) | 1.92 in (1918) |
| December 19 | 86.0°F (1921) | 27.0°F (1996) | 1.18 in (1918) |
| December 20 | 86.0°F (1921) | 27.0°F (1924) | 1.83 in (1940) |
| December 21 | 89.1°F (1948) | 26.1°F (1924) | 0.40 in (1929) |
| December 22 | 88.0°F (1998) | 25.0°F (1989) | 4.00 in (1940) |
| December 23 | 87.1°F (1988) | 16.0°F (1989) | 0.64 in (1962) |
| December 24 | 89.1°F (1948) | 17.1°F (1989) | 1.16 in (1962) |
| December 25 | 91.0°F (1945) | 17.1°F (1983) | 1.05 in (1958) |
| December 26 | 88.0°F (1916) | 28.0°F (1953) | 0.69 in (2025) |
| December 27 | 93.0°F (1968) | 30.0°F (1920) | 0.71 in (2013) |
| December 28 | 89.1°F (2008) | 23.0°F (1925) | 0.73 in (1925) |
| December 29 | 87.1°F (2024) | 25.0°F (1925) | 0.85 in (1925) |
| December 30 | 88.0°F (1921) | 21.0°F (1983) | 1.55 in (1916) |
| December 31 | 2304.0°F (1946) | 28.9°F (1917) | 2.20 in (2013) |