Riverside December 21 Weather Records

Daily averages and all-time records for weather in Riverside, California for the date of December 21.
December 21 All-Time Records
1893–2024
Highest temperature 90 °F 1917
Lowest temperature 25 °F 1968
Lowest daily high 50 °F 1990
Highest daily low 55 °F 1977
Most precipitation 1.36 inches 2010
December 21 Average Weather
1991–2020 1
Average high 67.4 °F
Average low 42.2 °F
Chance precipitation 17.7%
Riverside December 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 70 52 0.00 n/a
2022 75 39 0.00 n/a
2021 67 47 0.00 n/a
2020 84 49 0.00 n/a
2019 73 44 0.00 0.0
2018 71 49 0.00 0.0
2017 61 46 0.00 n/a
2016 67 51 0.49 0.0
2015 60 39 0.04 n/a
2014 67 43 0.00 0.0
2013 58 40 0.00 0.0
2012 64 36 0.00 0.0
2011 64 39 0.00 0.0
2010 56 52 1.36 n/a
2009 63 47 0.00 n/a
2008 64 37 0.00 n/a
2007 n/a n/a n/a n/a
2006 62 30 0.00 n/a
2005 84 44 0.00 n/a
2004 71 41 0.00 n/a
2003 64 42 0.00 n/a
2002 57 45 0.04 n/a
2001 53 38 0.29 n/a
2000 74 35 0.00 n/a
1999 75 41 0.00 n/a
1998 56 38 0.00 0.0
1997 58 38 0.15 0.0
1996 63 35 0.00 0.0
1995 67 36 0.00 0.0
1994 82 40 0.00 0.0
1993 69 38 0.00 0.0
1992 66 31 0.00 0.0
1991 74 43 0.00 0.0
1990 50 30 0.00 0.0
1989 68 37 0.00 0.0
1988 65 51 0.48 0.0
1987 73 36 0.00 0.0
1986 70 40 0.00 0.0
1985 81 38 0.00 0.0
1984 62 34 0.00 0.0
1983 61 42 0.00 0.0
1982 63 41 0.00 0.0
1981 65 50 0.01 0.0
1980 79 40 0.00 0.0
1979 60 48 0.08 0.0
1978 66 33 0.00 0.0
1977 65 55 0.04 0.0
1976 70 37 0.00 0.0
1975 65 37 0.01 0.0
1974 73 37 0.00 0.0
1973 66 37 0.00 0.0
1972 79 43 0.00 0.0
1971 62 36 0.00 0.0
1970 52 41 0.83 0.0
1969 61 44 0.00 0.0
1968 52 25 0.00 0.0
1967 55 30 0.00 0.0
1966 62 44 0.00 0.0
1965 62 39 0.00 0.0
1964 69 45 0.00 0.0
1963 66 36 0.00 0.0
1962 76 39 0.00 0.0
1961 70 38 0.00 0.0
1960 78 41 0.00 0.0
1959 64 50 0.57 0.0
1958 70 32 0.00 0.0
1957 65 38 0.00 0.0
1956 68 30 0.00 0.0
1955 70 37 0.00 0.0
1954 78 34 0.00 0.0
1953 74 35 0.00 0.0
1952 58 30 0.02 0.0
1951 64 30 0.00 0.0
1950 74 32 0.00 0.0
1949 59 25 0.00 0.0
1948 57 26 0.00 0.0
1947 67 n/a 0.00 0.0
1946 73 39 0.00 0.0
1945 56 50 0.41 0.0
1944 75 41 0.00 0.0
1943 59 48 0.33 0.0
1942 64 41 0.00 0.0
1941 62 35 0.00 0.0
1940 73 40 0.00 0.0
1939 82 45 0.00 0.0
1938 55 44 0.63 0.0
1937 65 37 0.00 0.0
1936 76 40 0.00 0.0
1935 62 40 0.00 0.0
1934 72 40 0.00 0.0
1933 80 38 0.00 n/a
1932 65 36 0.42 0.0
1931 60 48 0.01 n/a
1930 61 31 0.00 n/a
1929 73 33 0.00 0.0
1928 71 32 0.00 n/a
1927 52 32 0.31 n/a
1926 57 44 0.31 n/a
1925 69 34 n/a n/a
1924 64 31 n/a n/a
1923 66 31 n/a n/a
1922 78 39 n/a n/a
1921 59 52 0.85 n/a
1920 60 28 n/a n/a
1919 81 37 n/a n/a
1918 56 40 n/a n/a
1917 90 41 n/a n/a
1916 69 30 0.00 n/a
1915 84 38 0.00 0.0
1914 58 44 0.00 n/a
1913 62 38 0.00 n/a
1912 60 27 0.00 n/a
1911 57 40 0.00 0.0
1910 61 44 0.00 n/a
1909 54 39 0.54 n/a
1908 63 34 0.00 0.0
1907 67 49 0.00 n/a
1906 81 35 n/a n/a
1905 58 31 0.00 n/a
1904 68 35 0.00 n/a
1903 78 34 0.00 n/a
1902 69 31 0.00 n/a
1901 77 41 0.00 n/a
1900 n/a n/a n/a n/a
1899 n/a n/a n/a n/a
1898 n/a n/a n/a n/a
1897 n/a n/a n/a n/a
1896 n/a n/a n/a n/a
1895 55 41 0.11 n/a
1894 62 31 0.00 n/a
1893 51 42 0.00 n/a
What's the all-time high for Riverside on 12/21?
For the date of Dec 21, the highest temperature ever reached in Riverside history is 90 °F which happened in 1917.
Highest Temperatures in Riverside on December 21
Rank Temperature Year
1 90 °F 1917
2 84 °F 2020
2 84 °F 2005
2 84 °F 1915
5 82 °F 1939
5 82 °F 1994
7 81 °F 1906
7 81 °F 1985
7 81 °F 1919
10 80 °F 1933
What's the all-time low for Riverside on 12/21?
For the date of Dec 21, the lowest temperature ever reached in Riverside history is 25 °F which has happened 2 times, most recently in 1968.
Lowest Temperatures in Riverside on December 21
Rank Temperature Year
1 25 °F 1949
1 25 °F 1968
3 26 °F 1948
4 27 °F 1912
5 28 °F 1920
6 30 °F 1967
6 30 °F 1916
6 30 °F 1951
6 30 °F 1952
6 30 °F 1990
6 30 °F 2006
6 30 °F 1956
Lowest High Temperatures in Riverside on December 21
Rank Temperature Year
1 50 °F 1990
2 51 °F 1893
3 52 °F 1968
3 52 °F 1970
3 52 °F 1927
6 53 °F 2001
7 54 °F 1909
8 55 °F 1967
8 55 °F 1895
8 55 °F 1938
What's the most it has ever rained in Riverside on 12/21?
For the date of Dec 21, the most precipitation ever recorded in Riverside history is 1.36 inches which happened in 2010.
All-Time Most Precipitation in Riverside on December 21
Rank Precipitation Year
1 1.36 inches 2010
2 0.85 inches 1921
3 0.83 inches 1970
4 0.63 inches 1938
5 0.57 inches 1959
6 0.54 inches 1909
7 0.49 inches 2016
8 0.48 inches 1988
9 0.42 inches 1932
10 0.41 inches 1945
Weather Station Details
Years Station Coordinates
1999–2024 Riverside Municipal Airport location
1893–1998 Riverside Fire Station location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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