December weather in Ross, CA
The average temperature in Ross in December is 49.1°F (41.7°F–56.4°F). Average precipitation: 9.78 inches.
December is a winter month in Ross, and is cooler than the annual average of 59.3°F. Daily temperatures swing about 14.7°F between overnight low and afternoon high. Expect about 12 days with precipitation. Daylight averages about 9h 23m. For travel, December is a wet month.
Avg High
56.4°F
Avg Low
41.7°F
Precipitation
9.78 in
Daylight
9h 23m
December records in Ross
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 70.0°F (2021) | 28.9°F (1918) | 4.15 in (1951) |
| December 2 | 75.0°F (2011) | 28.0°F (1906) | 3.64 in (2012) |
| December 3 | 79.0°F (1927) | 23.0°F (1998) | 4.74 in (1950) |
| December 4 | 72.0°F (1940) | 26.1°F (1909) | 4.50 in (1970) |
| December 5 | 75.0°F (1929) | 26.1°F (2013) | 4.20 in (1948) |
| December 6 | 72.0°F (1934) | 28.0°F (1921) | 6.24 in (1952) |
| December 7 | 72.0°F (1925) | 28.0°F (1927) | 2.33 in (1909) |
| December 8 | 71.1°F (1988) | 25.0°F (1916) | 3.78 in (2004) |
| December 9 | 70.0°F (1934) | 19.0°F (1972) | 3.20 in (1992) |
| December 10 | 70.0°F (1923) | 21.9°F (1932) | 8.04 in (1937) |
| December 11 | 69.1°F (1988) | 18.0°F (1932) | 7.73 in (1995) |
| December 12 | 73.0°F (1911) | 21.0°F (1932) | 4.38 in (1995) |
| December 13 | 73.0°F (1911) | 19.0°F (1932) | 5.50 in (2002) |
| December 14 | 70.0°F (1942) | 19.0°F (1932) | 4.17 in (2002) |
| December 15 | 69.1°F (1956) | 19.9°F (1932) | 3.85 in (2016) |
| December 16 | 70.0°F (1956) | 19.9°F (1926) | 2.44 in (1924) |
| December 17 | 71.1°F (1996) | 25.0°F (1924) | 2.80 in (1977) |
| December 18 | 68.0°F (1958) | 21.0°F (1924) | 5.04 in (2005) |
| December 19 | 69.1°F (1929) | 21.0°F (1924) | 5.75 in (1955) |
| December 20 | 73.0°F (1999) | 23.0°F (1998) | 4.65 in (1969) |
| December 21 | 69.1°F (1999) | 23.0°F (1915) | 4.18 in (1924) |
| December 22 | 71.1°F (1999) | 18.0°F (1990) | 7.41 in (1955) |
| December 23 | 66.9°F (1999) | 21.0°F (1949) | 6.20 in (1955) |
| December 24 | 68.0°F (1938) | 21.9°F (1948) | 3.40 in (1979) |
| December 25 | 66.0°F (1956) | 23.0°F (1924) | 3.18 in (1983) |
| December 26 | 69.1°F (1956) | 19.9°F (1924) | 3.30 in (1936) |
| December 27 | 73.9°F (1967) | 25.0°F (1923) | 6.01 in (2004) |
| December 28 | 73.9°F (1922) | 26.1°F (1918) | 2.15 in (1992) |
| December 29 | 75.9°F (1967) | 25.0°F (1930) | 5.10 in (2003) |
| December 30 | 69.1°F (1967) | 25.0°F (1926) | 4.07 in (1913) |
| December 31 | 69.1°F (1920) | 17.1°F (1915) | 7.34 in (2005) |