December weather in Forest Grove, OR
The average temperature in Forest Grove in December is 38.4°F (32.8°F–44.0°F). Average precipitation: 8.72 inches. Average snowfall is 1.3 inches.
December is a winter month in Forest Grove, and is cooler than the annual average of 52.1°F. Daily temperatures swing about 11.2°F between overnight low and afternoon high. Expect about 19 days with precipitation. Daylight averages about 8h 31m. For travel, December is a wet month.
Avg High
44.0°F
Avg Low
32.8°F
Precipitation
8.72 in
Snow
1.3 in
December records in Forest Grove
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 63.0°F (1958) | 19.0°F (2019) | 1.82 in (1993) |
| December 2 | 60.1°F (1927) | 19.0°F (1985) | 3.14 in (2007) |
| December 3 | 60.1°F (1958) | 21.0°F (1928) | 2.93 in (2001) |
| December 4 | 59.0°F (1989) | 19.9°F (2013) | 2.12 in (1968) |
| December 5 | 64.0°F (1898) | 15.1°F (2013) | 1.54 in (1981) |
| December 6 | 59.0°F (2025) | 19.0°F (1972) | 3.12 in (1923) |
| December 7 | 61.0°F (1938) | 3.9°F (1972) | 1.70 in (1952) |
| December 8 | 61.0°F (2015) | -4.0°F (1972) | 2.65 in (1902) |
| December 9 | 61.0°F (2015) | 1.0°F (1972) | 2.10 in (2025) |
| December 10 | 62.1°F (1993) | -0.9°F (1972) | 1.83 in (1937) |
| December 11 | 59.0°F (2014) | -2.9°F (1919) | 2.03 in (1969) |
| December 12 | 61.0°F (1960) | 6.1°F (1932) | 1.89 in (2023) |
| December 13 | 62.1°F (2004) | 0.0°F (1972) | 2.15 in (1977) |
| December 14 | 60.1°F (1977) | 12.9°F (1926) | 2.10 in (1977) |
| December 15 | 60.1°F (1962) | 7.0°F (1919) | 2.32 in (1982) |
| December 16 | 62.1°F (1974) | 10.0°F (2008) | 1.56 in (2009) |
| December 17 | 59.0°F (1980) | 7.0°F (1964) | 2.26 in (2001) |
| December 18 | 59.0°F (1917) | 3.0°F (1924) | 1.75 in (2015) |
| December 19 | 59.0°F (1961) | 3.0°F (1924) | 2.20 in (1957) |
| December 20 | 61.0°F (1974) | 12.0°F (1990) | 1.98 in (1940) |
| December 21 | 60.1°F (1955) | 3.0°F (1990) | 3.04 in (1955) |
| December 22 | 60.1°F (1964) | 3.9°F (1990) | 2.31 in (1964) |
| December 23 | 63.0°F (1950) | 6.1°F (1990) | 1.26 in (1949) |
| December 24 | 57.9°F (1950) | 5.0°F (1990) | 1.39 in (1965) |
| December 25 | 64.0°F (1980) | 6.1°F (1924) | 2.45 in (1980) |
| December 26 | 61.0°F (1980) | 3.9°F (1924) | 2.00 in (1937) |
| December 27 | 60.1°F (1917) | 17.1°F (1948) | 3.58 in (1937) |
| December 28 | 60.1°F (2004) | 17.1°F (1978) | 1.70 in (1917) |
| December 29 | 60.1°F (1917) | 9.0°F (1916) | 3.14 in (1996) |
| December 30 | 61.0°F (1998) | 3.0°F (1939) | 50.01 in (1939) |
| December 31 | 57.9°F (1917) | 8.1°F (1968) | 4.28 in (1904) |