December weather in Clearlake, CA
The average temperature in Clearlake in December is 43.7°F (32.6°F–54.8°F). Average precipitation: 6.08 inches.
December is a winter month in Clearlake, and is cooler than the annual average of 56.9°F. Daily temperatures swing about 22.2°F between overnight low and afternoon high. Expect about 13 days with precipitation. Daylight averages about 9h 17m. For travel, December is a wet month.
Avg High
54.8°F
Avg Low
32.6°F
Precipitation
6.08 in
Daylight
9h 17m
December records in Clearlake
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 71.1°F (1995) | 19.0°F (1969) | 3.00 in (1960) |
| December 2 | 73.0°F (2013) | 17.1°F (2015) | 2.54 in (2001) |
| December 3 | 72.0°F (2011) | 19.9°F (1956) | 2.36 in (1980) |
| December 4 | 69.1°F (1958) | 21.0°F (1968) | 1.71 in (1980) |
| December 5 | 70.0°F (2020) | 12.9°F (2013) | 1.10 in (1966) |
| December 6 | 70.0°F (1959) | 12.9°F (2013) | 1.52 in (1987) |
| December 7 | 73.0°F (1979) | 17.1°F (1978) | 1.94 in (2004) |
| December 8 | 79.0°F (2021) | 12.9°F (1956) | 1.06 in (2004) |
| December 9 | 73.9°F (2020) | 9.0°F (1972) | 2.06 in (1983) |
| December 10 | 69.1°F (1988) | 10.0°F (1972) | 2.32 in (1996) |
| December 11 | 71.1°F (2025) | 9.0°F (1972) | 1.47 in (1983) |
| December 12 | 69.1°F (1958) | 10.9°F (1972) | 6.28 in (1995) |
| December 13 | 72.0°F (2017) | 10.9°F (1972) | 0.96 in (1995) |
| December 14 | 71.1°F (1958) | 17.1°F (1972) | 2.87 in (2002) |
| December 15 | 72.0°F (1980) | 12.9°F (1972) | 2.30 in (2002) |
| December 16 | 78.1°F (1980) | 15.1°F (1978) | 4.29 in (2002) |
| December 17 | 77.0°F (1998) | 16.0°F (1965) | 1.04 in (1972) |
| December 18 | 79.0°F (2021) | 17.1°F (1965) | 2.02 in (2005) |
| December 19 | 71.1°F (2017) | 15.1°F (1965) | 3.32 in (1955) |
| December 20 | 70.0°F (1999) | 15.1°F (1965) | 1.98 in (2002) |
| December 21 | 75.0°F (1999) | 12.0°F (1990) | 1.06 in (2001) |
| December 22 | 73.0°F (1999) | 6.1°F (1990) | 1.76 in (1971) |
| December 23 | 73.0°F (2013) | 7.0°F (1990) | 1.52 in (1964) |
| December 24 | 69.1°F (1989) | 10.9°F (1990) | 2.38 in (1979) |
| December 25 | 75.0°F (1967) | 14.0°F (1990) | 2.83 in (1983) |
| December 26 | 77.0°F (1967) | 14.0°F (1956) | 1.04 in (1955) |
| December 27 | 75.0°F (1967) | 12.9°F (1956) | 3.16 in (2004) |
| December 28 | 78.1°F (1967) | 15.1°F (1956) | 1.52 in (2005) |
| December 29 | 71.1°F (1997) | 15.1°F (1956) | 1.44 in (2003) |
| December 30 | 72.0°F (1989) | 14.0°F (1990) | 2.02 in (2003) |
| December 31 | 70.0°F (1963) | 12.9°F (1990) | 3.20 in (2005) |