January weather in Castle Rock, WA
The average temperature in Castle Rock in January is 41.4°F (35.1°F–47.7°F). Average precipitation: 6.53 inches.
January is a winter month in Castle Rock, and is cooler than the annual average of 53.2°F. Daily temperatures swing about 12.6°F between overnight low and afternoon high. Expect about 24 days with precipitation. Daylight averages about 8h 48m. For travel, January is a wet month.
Avg High
47.7°F
Avg Low
35.1°F
Precipitation
6.53 in
Daylight
8h 48m
January records in Castle Rock
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| January 1 | 57.9°F (1939) | 7.0°F (1979) | 1.54 in (2009) |
| January 2 | 57.0°F (1953) | 8.1°F (1979) | 1.51 in (1933) |
| January 3 | 57.9°F (1953) | 10.0°F (1950) | 1.85 in (2022) |
| January 4 | 55.9°F (1984) | 14.0°F (1959) | 1.40 in (2007) |
| January 5 | 57.9°F (2003) | 10.9°F (1942) | 2.50 in (2015) |
| January 6 | 55.9°F (2001) | 10.0°F (1937) | 2.61 in (2022) |
| January 7 | 57.9°F (2003) | 7.0°F (1937) | 3.45 in (2009) |
| January 8 | 57.9°F (1941) | 5.0°F (1937) | 1.14 in (2002) |
| January 9 | 55.9°F (1959) | 10.9°F (1930) | 1.70 in (1980) |
| January 10 | 59.0°F (1945) | 7.0°F (1930) | 1.49 in (1990) |
| January 11 | 57.9°F (1953) | 1.9°F (1930) | 1.74 in (1972) |
| January 12 | 61.0°F (2022) | 0.0°F (1930) | 2.06 in (1936) |
| January 13 | 61.0°F (2018) | 3.0°F (1930) | 1.71 in (1975) |
| January 14 | 63.0°F (2018) | -0.9°F (1930) | 1.91 in (1975) |
| January 15 | 60.1°F (2018) | 10.0°F (1947) | 1.65 in (1974) |
| January 16 | 57.9°F (1958) | 19.9°F (1930) | 2.49 in (2011) |
| January 17 | 57.0°F (2011) | -6.0°F (1930) | 1.29 in (1982) |
| January 18 | 59.0°F (1953) | 6.1°F (1950) | 1.72 in (2005) |
| January 19 | 62.1°F (2005) | 12.0°F (1935) | 1.44 in (1934) |
| January 20 | 59.0°F (2005) | -16.1°F (1930) | 1.40 in (1953) |
| January 21 | 60.1°F (1995) | -20.0°F (1930) | 1.32 in (1972) |
| January 22 | 64.0°F (1968) | -6.0°F (1930) | 1.70 in (1954) |
| January 23 | 59.0°F (1995) | 9.0°F (1929) | 2.27 in (1982) |
| January 24 | 61.0°F (1935) | 8.1°F (1930) | 2.65 in (1984) |
| January 25 | 63.0°F (2015) | 0.0°F (1930) | 1.92 in (1964) |
| January 26 | 61.0°F (1986) | 7.0°F (1950) | 1.65 in (1971) |
| January 27 | 62.1°F (2003) | 8.1°F (1957) | 1.29 in (1965) |
| January 28 | 64.9°F (1931) | 7.0°F (1957) | 1.63 in (1992) |
| January 29 | 62.1°F (1931) | 9.0°F (1957) | 2.03 in (2004) |
| January 30 | 61.0°F (1940) | 9.0°F (1980) | 1.58 in (2006) |
| January 31 | 63.0°F (1940) | 1.0°F (1950) | 1.71 in (2003) |