December weather in St. Helens, OR
The average temperature in St. Helens in December is 37.6°F (33.1°F–42.0°F). Average precipitation: inches.
December is a winter month in St. Helens, and is cooler than the annual average of 51.6°F. Daily temperatures swing about 8.9°F between overnight low and afternoon high. Daylight averages about 8h 29m. For travel, December is cold.
Avg High
42.0°F
Avg Low
33.1°F
Precipitation
in
Daylight
8h 29m
December records in St. Helens
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| December 1 | 59.0°F (1993) | 19.9°F (1985) | 1.84 in (1987) |
| December 2 | 55.9°F (1977) | 9.0°F (1999) | 3.90 in (2007) |
| December 3 | 64.9°F (1993) | 25.0°F (1997) | 1.60 in (1987) |
| December 4 | 60.1°F (2007) | 17.1°F (2013) | 1.20 in (1989) |
| December 5 | 59.0°F (1989) | 17.1°F (2013) | 1.92 in (1981) |
| December 6 | 60.1°F (1988) | 21.9°F (2013) | 1.25 in (1987) |
| December 7 | 57.0°F (1988) | 12.0°F (2013) | 0.92 in (2010) |
| December 8 | 53.1°F (1987) | 9.0°F (2013) | 1.31 in (1993) |
| December 9 | 57.9°F (1987) | 12.9°F (2013) | 1.80 in (1994) |
| December 10 | 60.1°F (2004) | 24.1°F (2005) | 2.00 in (1995) |
| December 11 | 57.0°F (2004) | 19.9°F (1985) | 1.33 in (2010) |
| December 12 | 60.1°F (1995) | 19.9°F (1985) | 0.90 in (1995) |
| December 13 | 61.0°F (1998) | 21.9°F (1985) | 2.00 in (1977) |
| December 14 | 59.0°F (2002) | 21.9°F (2008) | 1.30 in (2002) |
| December 15 | 55.9°F (1980) | 12.9°F (2008) | 1.77 in (1982) |
| December 16 | 60.1°F (1980) | 18.0°F (2005) | 1.87 in (2012) |
| December 17 | 57.0°F (1999) | 24.1°F (1985) | 1.01 in (1982) |
| December 18 | 55.9°F (1999) | 23.0°F (1984) | 2.20 in (2014) |
| December 19 | 57.0°F (1976) | 5.0°F (1982) | 1.40 in (2012) |
| December 20 | 60.1°F (1994) | 12.9°F (1990) | 1.52 in (1982) |
| December 21 | 55.9°F (2014) | 1.0°F (1990) | 1.21 in (2005) |
| December 22 | 55.9°F (2014) | 10.9°F (1990) | 1.43 in (2000) |
| December 23 | 52.0°F (1986) | 9.0°F (1990) | 0.83 in (1979) |
| December 24 | 54.0°F (1979) | 12.9°F (1990) | 1.15 in (2006) |
| December 25 | 62.1°F (1980) | 17.1°F (1983) | 0.98 in (2012) |
| December 26 | 54.0°F (1994) | 17.1°F (2004) | 0.90 in (1996) |
| December 27 | 60.1°F (1980) | 21.0°F (1985) | 1.10 in (1998) |
| December 28 | 55.0°F (1980) | 18.0°F (1983) | 1.23 in (2005) |
| December 29 | 52.0°F (1976) | 12.9°F (1990) | 1.10 in (1983) |
| December 30 | 57.0°F (1980) | 12.0°F (1978) | 1.64 in (2005) |
| December 31 | 54.0°F (1995) | 14.0°F (1978) | 1.21 in (1996) |