December weather in Portola, CA
The average temperature in Portola in December is 30.7°F (19.4°F–42.1°F). Average precipitation: 4.28 inches. Average snowfall is 7.2 inches.
December is a winter month in Portola, and is cooler than the annual average of 46.7°F. Daily temperatures swing about 22.7°F between overnight low and afternoon high. Expect about 8 days with precipitation. Daylight averages about 9h 11m. For travel, December is cold.
Avg High
42.1°F
Avg Low
19.4°F
Precipitation
4.28 in
Snow
7.2 in
December records in Portola
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 68.0°F (1920) | 8.1°F (1923) | 2.08 in (1951) |
| December 2 | 68.0°F (1958) | 1.9°F (1967) | 1.60 in (1970) |
| December 3 | 70.0°F (1958) | -2.0°F (1952) | 2.43 in (1941) |
| December 4 | 66.0°F (1958) | -9.9°F (1920) | 1.59 in (2014) |
| December 5 | 66.0°F (1918) | -9.0°F (1919) | 1.62 in (1966) |
| December 6 | 64.0°F (1929) | -4.0°F (1919) | 1.50 in (1922) |
| December 7 | 63.0°F (1921) | -8.0°F (1919) | 1.61 in (1952) |
| December 8 | 72.0°F (1921) | -14.1°F (1919) | 2.15 in (1997) |
| December 9 | 66.0°F (1929) | -27.9°F (1972) | 2.02 in (1929) |
| December 10 | 68.0°F (1950) | -18.0°F (1932) | 2.60 in (1937) |
| December 11 | 70.0°F (1921) | -11.9°F (1932) | 2.50 in (2022) |
| December 12 | 68.0°F (1921) | -18.9°F (1919) | 1.85 in (1995) |
| December 13 | 62.1°F (1921) | -9.0°F (1919) | 1.30 in (1995) |
| December 14 | 64.0°F (1921) | -2.0°F (1959) | 2.05 in (2021) |
| December 15 | 62.1°F (1921) | -4.0°F (1927) | 1.85 in (2002) |
| December 16 | 64.9°F (1958) | -5.1°F (1927) | 1.46 in (2002) |
| December 17 | 63.0°F (1958) | -20.0°F (1924) | 1.70 in (1970) |
| December 18 | 66.9°F (1958) | -16.1°F (1924) | 1.85 in (2010) |
| December 19 | 62.1°F (1939) | -5.1°F (1992) | 4.18 in (1955) |
| December 20 | 64.0°F (1921) | -11.9°F (1949) | 1.19 in (1981) |
| December 21 | 66.0°F (1921) | -13.0°F (1990) | 2.50 in (1982) |
| December 22 | 68.0°F (1921) | -23.1°F (1990) | 2.15 in (2025) |
| December 23 | 64.0°F (1921) | -14.1°F (1990) | 2.97 in (1955) |
| December 24 | 60.1°F (1921) | -11.0°F (1990) | 1.50 in (1969) |
| December 25 | 57.9°F (1917) | -9.0°F (1916) | 1.40 in (2025) |
| December 26 | 62.1°F (1980) | -11.0°F (1988) | 2.00 in (1951) |
| December 27 | 61.0°F (1947) | -14.1°F (1916) | 1.76 in (1996) |
| December 28 | 60.1°F (1917) | 0.0°F (1990) | 2.20 in (1942) |
| December 29 | 60.1°F (2017) | -4.0°F (1916) | 3.60 in (1992) |
| December 30 | 62.1°F (2017) | -11.0°F (1916) | 2.46 in (1992) |
| December 31 | 60.1°F (2017) | -18.9°F (1923) | 1.31 in (1996) |