Seattle December 21 Weather Records

Daily averages and all-time records for weather in Seattle, Washington for the date of December 21.
December 21 All-Time Records
1894–2024
Highest temperature 63 °F 1940
Lowest temperature 12 °F 1990
Lowest daily high 20 °F 1990
Highest daily low 50 °F 2014
Most precipitation 1.64 inches 2020
Most snow 3.0 inches 2008
December 21 Average Weather
1991–2020 1
Average high 46.0 °F
Average low 36.5 °F
Chance precipitation 61.5%
Chance snow 5.4%
Seattle December 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 50 42 0.00 0.0
2022 30 20 0.00 0.3
2021 41 34 0.19 0.0
2020 59 34 1.64 0.5
2019 52 43 0.83 0.0
2018 44 35 0.00 0.0
2017 41 29 0.01 0.0
2016 47 34 0.00 0.0
2015 42 37 1.08 0.0
2014 55 50 0.00 0.0
2013 48 42 0.22 0.0
2012 47 29 0.07 0.0
2011 45 32 0.00 0.0
2010 51 42 0.01 0.0
2009 52 38 0.55 0.0
2008 31 24 0.27 3.0
2007 42 32 0.00 n/a
2006 50 37 0.50 n/a
2005 56 49 0.40 n/a
2004 46 34 0.00 n/a
2003 51 38 0.01 n/a
2002 45 39 0.00 n/a
2001 45 35 0.00 n/a
2000 47 41 0.08 n/a
1999 46 37 0.00 n/a
1998 25 18 0.00 n/a
1997 43 32 0.00 n/a
1996 42 35 0.05 n/a
1995 51 38 0.00 0.0
1994 52 42 0.01 0.0
1993 43 31 0.00 0.0
1992 44 40 0.05 0.0
1991 46 40 0.17 0.0
1990 20 12 0.00 0.0
1989 51 40 0.00 0.0
1988 46 36 0.06 0.0
1987 44 36 0.15 0.0
1986 51 40 0.35 0.0
1985 40 26 0.00 0.0
1984 43 33 0.05 0.0
1983 24 16 0.00 0.0
1982 48 39 0.22 0.0
1981 41 34 0.07 0.0
1980 52 45 0.70 0.0
1979 47 38 0.76 0.0
1978 45 41 0.03 0.0
1977 50 36 0.00 0.0
1976 49 41 0.00 0.0
1975 55 29 0.10 0.0
1974 54 33 0.15 0.0
1973 50 44 0.13 0.0
1972 54 48 0.93 0.0
1971 41 34 0.23 0.1
1970 36 29 0.00 0.0
1969 53 45 0.38 0.0
1968 35 29 0.12 1.0
1967 48 30 0.50 2.6
1966 44 37 0.00 0.0
1965 42 31 0.30 0.0
1964 41 34 0.99 0.0
1963 44 36 0.00 0.0
1962 47 37 0.10 0.0
1961 42 36 0.00 0.0
1960 45 34 0.00 0.0
1959 38 32 0.00 0.0
1958 49 39 0.26 0.0
1957 42 36 0.43 0.0
1956 43 35 0.00 0.0
1955 52 42 0.88 0.0
1954 49 45 0.27 0.0
1953 47 36 0.00 0.0
1952 46 33 0.77 0.0
1951 48 34 0.56 0.0
1950 53 45 0.08 0.0
1949 44 35 0.02 0.0
1948 39 31 0.00 0.0
1947 48 43 0.33 0.0
1946 50 38 0.01 0.0
1945 47 39 0.32 0.0
1944 51 42 0.00 0.0
1943 41 30 0.00 0.0
1942 51 44 0.41 0.0
1941 45 42 0.10 0.0
1940 63 48 0.01 0.0
1939 47 42 0.00 0.0
1938 44 38 0.11 0.0
1937 45 38 0.01 0.0
1936 54 47 0.30 0.0
1935 45 33 0.00 0.0
1934 54 42 0.61 0.0
1933 57 38 1.02 0.0
1932 47 40 0.02 0.0
1931 45 38 0.01 0.0
1930 49 39 0.00 0.0
1929 49 40 0.40 0.0
1928 45 35 0.06 0.0
1927 41 34 0.00 0.0
1926 40 35 0.09 0.0
1925 54 43 0.55 0.0
1924 34 24 0.00 0.0
1923 50 40 0.00 0.0
1922 52 40 0.01 0.0
1921 41 30 0.00 0.0
1920 44 39 0.24 0.0
1919 54 49 0.27 0.0
1918 44 35 0.00 0.0
1917 53 38 0.86 0.0
1916 39 34 0.51 0.0
1915 54 45 0.58 0.0
1914 39 24 0.00 0.0
1913 44 28 0.08 0.0
1912 41 36 0.00 0.0
1911 44 36 0.00 0.0
1910 44 38 0.00 0.0
1909 43 27 0.00 0.0
1908 43 36 0.23 0.0
1907 49 43 0.26 0.0
1906 56 42 0.31 0.0
1905 43 35 0.00 0.0
1904 46 39 0.27 0.0
1903 48 42 0.09 0.0
1902 45 33 0.00 0.0
1901 48 46 0.05 0.0
1900 50 44 0.37 0.0
1899 55 50 0.33 0.0
1898 46 37 0.00 0.0
1897 41 37 0.00 0.0
1896 52 38 0.00 0.0
1895 40 33 0.04 0.5
1894 46 41 0.13 0.0
What's the all-time high for Seattle on 12/21?
For the date of Dec 21, the highest temperature ever reached in Seattle history is 63 °F which happened in 1940.
Highest Temperatures in Seattle on December 21
Rank Temperature Year
1 63 °F 1940
2 59 °F 2020
3 57 °F 1933
4 56 °F 2005
4 56 °F 1906
6 55 °F 2014
6 55 °F 1899
6 55 °F 1975
9 54 °F 1972
9 54 °F 1934
9 54 °F 1974
9 54 °F 1925
9 54 °F 1936
9 54 °F 1919
9 54 °F 1915
What's the all-time low for Seattle on 12/21?
For the date of Dec 21, the lowest temperature ever reached in Seattle history is 12 °F which happened in 1990.
Lowest Temperatures in Seattle on December 21
Rank Temperature Year
1 12 °F 1990
2 16 °F 1983
3 18 °F 1998
4 20 °F 2022
5 24 °F 1924
5 24 °F 2008
5 24 °F 1914
8 26 °F 1985
9 27 °F 1909
10 28 °F 1913
Lowest High Temperatures in Seattle on December 21
Rank Temperature Year
1 20 °F 1990
2 24 °F 1983
3 25 °F 1998
4 30 °F 2022
5 31 °F 2008
6 34 °F 1924
7 35 °F 1968
8 36 °F 1970
9 38 °F 1959
10 39 °F 1948
10 39 °F 1914
10 39 °F 1916
What's the most it has ever rained in Seattle on 12/21?
For the date of Dec 21, the most precipitation ever recorded in Seattle history is 1.64 inches which happened in 2020.
All-Time Most Precipitation in Seattle on December 21
Rank Precipitation Year
1 1.64 inches 2020
2 1.08 inches 2015
3 1.02 inches 1933
4 0.99 inches 1964
5 0.93 inches 1972
6 0.88 inches 1955
7 0.86 inches 1917
8 0.83 inches 2019
9 0.77 inches 1952
10 0.76 inches 1979
All-Time Most Snow in Seattle on December 21
Rank Precipitation Year
1 3.0 inches 2008
2 2.6 inches 1967
3 1.0 inches 1968
4 0.5 inches 2020
4 0.5 inches 1895
6 0.3 inches 2022
7 0.1 inches 1971
Weather Station Details
Years Station Coordinates
1948–2024 Seattle Tacoma International Airport location
1894–1947 University of Washington location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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