December weather in Lake Oswego, OR
The average temperature in Lake Oswego in December is 41.8°F (36.3°F–47.3°F). Average precipitation: 7.20 inches.
December is a winter month in Lake Oswego, and is cooler than the annual average of 55.4°F. Daily temperatures swing about 11°F between overnight low and afternoon high. Daylight averages about 8h 32m. For travel, December is a wet month.
Avg High
47.3°F
Avg Low
36.3°F
Precipitation
7.20 in
Daylight
8h 32m
December records in Lake Oswego
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1958) | 21.0°F (1985) | 1.20 in (1987) |
| December 2 | 62.1°F (1958) | 21.9°F (1985) | 2.00 in (1980) |
| December 3 | 62.1°F (1958) | 25.0°F (1969) | 2.35 in (1980) |
| December 4 | 63.0°F (2023) | 21.9°F (1972) | 2.53 in (1968) |
| December 5 | 63.0°F (2023) | 19.0°F (2013) | 2.00 in (1981) |
| December 6 | 60.1°F (1965) | 21.0°F (1972) | 1.55 in (1991) |
| December 7 | 57.9°F (1957) | 15.1°F (1972) | 2.15 in (2015) |
| December 8 | 61.0°F (1957) | 7.0°F (1972) | 1.41 in (2015) |
| December 9 | 62.1°F (2015) | 10.0°F (1972) | 2.11 in (1929) |
| December 10 | 68.0°F (1993) | 9.0°F (1972) | 1.93 in (1929) |
| December 11 | 68.0°F (1993) | 10.0°F (1972) | 1.73 in (1977) |
| December 12 | 66.0°F (1995) | 19.9°F (1972) | 1.26 in (1959) |
| December 13 | 61.0°F (2010) | 10.9°F (1972) | 2.52 in (1977) |
| December 14 | 60.1°F (2002) | 21.9°F (1967) | 1.62 in (1929) |
| December 15 | 60.1°F (1962) | 21.0°F (2008) | 1.65 in (2009) |
| December 16 | 59.0°F (1957) | 10.0°F (1964) | 1.76 in (1973) |
| December 17 | 59.0°F (1959) | 6.1°F (1964) | 2.02 in (2015) |
| December 18 | 57.0°F (1972) | 12.0°F (1964) | 1.72 in (1960) |
| December 19 | 62.1°F (1994) | 19.0°F (1964) | 4.41 in (1917) |
| December 20 | 63.0°F (1994) | 10.0°F (1990) | 2.00 in (2020) |
| December 21 | 61.0°F (1955) | 6.1°F (1990) | 2.06 in (1925) |
| December 22 | 61.0°F (1955) | 10.0°F (1990) | 3.22 in (1964) |
| December 23 | 64.9°F (1950) | 10.9°F (1983) | 1.29 in (1932) |
| December 24 | 59.0°F (2005) | 12.0°F (1990) | 1.87 in (1980) |
| December 25 | 63.0°F (2005) | 15.1°F (1983) | 2.27 in (1980) |
| December 26 | 63.0°F (1980) | 21.9°F (1962) | 1.44 in (1955) |
| December 27 | 60.1°F (1980) | 19.0°F (1948) | 2.11 in (1928) |
| December 28 | 57.0°F (1949) | 21.0°F (1985) | 2.00 in (2010) |
| December 29 | 57.9°F (1950) | 12.0°F (1990) | 1.64 in (1996) |
| December 30 | 66.0°F (1980) | 7.0°F (1968) | 2.00 in (2005) |
| December 31 | 60.1°F (1980) | 7.0°F (1968) | 1.19 in (1913) |