San Luis Obispo December 21 Weather Records

Daily averages and all-time records for weather in San Luis Obispo, California for the date of December 21.
December 21 All-Time Records
1893–2024
Highest temperature 80 °F 2020
Lowest temperature 30 °F 2012
Lowest daily high 46 °F 1968
Highest daily low 56 °F 1972
Most precipitation 2.25 inches 1970
December 21 Average Weather
1991–2020 1
Average high 64.9 °F
Average low 40.8 °F
Chance precipitation 27.4%
San Luis Obispo December 21 Weather by Year
Year High (°F) Low (°F) Precip. (inches) Snow (inches)
2023 66 54 0.04 n/a
2022 72 41 0.00 n/a
2021 64 37 0.00 n/a
2020 80 37 0.00 n/a
2019 63 39 0.00 0.0
2018 67 49 0.00 0.0
2017 62 34 0.00 n/a
2016 73 42 0.00 0.0
2015 59 43 0.14 n/a
2014 69 53 0.00 0.0
2013 71 35 0.00 0.0
2012 61 30 0.00 0.0
2011 63 34 0.00 0.0
2010 59 49 0.29 n/a
2009 61 44 0.10 n/a
2008 67 41 0.02 n/a
2007 58 41 0.00 n/a
2006 63 33 0.05 n/a
2005 67 42 0.00 n/a
2004 65 40 0.00 n/a
2003 64 44 0.06 n/a
2002 53 41 0.47 n/a
2001 59 45 0.04 n/a
2000 64 34 0.00 n/a
1999 76 37 0.00 n/a
1998 47 30 0.00 0.0
1997 65 44 0.00 0.0
1996 67 38 0.00 0.0
1995 59 38 0.00 0.0
1994 76 40 0.00 0.0
1993 68 40 0.00 0.0
1992 60 34 0.00 0.0
1991 65 35 0.00 0.0
1990 48 30 0.01 0.0
1989 67 37 0.00 0.0
1988 60 42 1.02 n/a
1987 64 35 0.00 0.0
1986 60 44 0.00 0.0
1985 80 44 0.00 0.0
1984 57 39 0.00 0.0
1983 59 42 0.00 0.0
1982 65 43 0.00 0.0
1981 59 48 n/a 0.0
1980 75 47 0.00 0.0
1979 63 40 0.05 0.0
1978 58 42 0.00 0.0
1977 66 44 0.00 0.0
1976 70 40 0.00 0.0
1975 60 36 0.00 0.0
1974 69 40 0.00 0.0
1973 70 41 0.00 0.0
1972 71 56 0.00 0.0
1971 59 32 0.00 0.0
1970 53 35 2.25 0.0
1969 65 52 0.03 0.0
1968 46 34 0.00 0.0
1967 52 30 0.03 0.0
1966 69 39 0.00 0.0
1965 58 38 0.00 0.0
1964 60 54 0.22 0.0
1963 68 47 0.00 0.0
1962 74 43 0.00 0.0
1961 73 50 0.00 0.0
1960 72 50 0.00 0.0
1959 64 48 0.00 0.0
1958 64 35 0.00 0.0
1957 66 43 0.00 0.0
1956 75 44 0.00 0.0
1955 62 52 0.13 0.0
1954 74 41 0.00 0.0
1953 70 52 0.00 0.0
1952 57 40 0.04 0.0
1951 57 39 0.00 0.0
1950 69 45 0.01 0.0
1949 49 36 0.00 0.0
1948 63 40 0.00 0.0
1947 61 48 1.29 0.0
1946 68 42 0.00 0.0
1945 62 52 0.21 0.0
1944 71 44 0.00 0.0
1943 58 43 0.40 0.0
1942 62 44 0.00 n/a
1941 59 44 0.20 n/a
1940 65 47 n/a n/a
1939 62 42 0.00 n/a
1938 58 46 0.06 n/a
1937 68 40 0.00 n/a
1936 71 46 n/a n/a
1935 72 44 0.00 n/a
1934 70 54 0.00 n/a
1933 72 42 0.00 n/a
1932 50 40 0.18 n/a
1931 59 43 2.13 n/a
1930 68 32 0.00 n/a
1929 70 41 0.00 n/a
1928 67 31 0.00 n/a
1927 56 41 0.30 n/a
1926 n/a n/a n/a n/a
1925 n/a n/a n/a n/a
1924 n/a n/a n/a n/a
1923 n/a n/a n/a n/a
1922 n/a n/a n/a n/a
1921 n/a n/a n/a n/a
1920 n/a n/a n/a n/a
1919 n/a n/a n/a n/a
1918 n/a n/a n/a n/a
1917 n/a n/a n/a n/a
1916 n/a n/a 0.00 n/a
1915 n/a n/a n/a n/a
1914 n/a n/a 0.00 n/a
1913 n/a n/a n/a n/a
1912 n/a n/a n/a n/a
1911 n/a n/a n/a n/a
1910 n/a n/a n/a n/a
1909 n/a n/a 0.76 n/a
1908 n/a n/a 0.00 n/a
1907 n/a n/a 0.00 n/a
1906 n/a n/a 0.00 0.0
1905 n/a n/a n/a n/a
1904 n/a n/a n/a n/a
1903 n/a n/a n/a n/a
1902 n/a n/a n/a n/a
1901 n/a n/a n/a 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 n/a n/a 0.00 n/a
1894 n/a n/a 0.00 n/a
1893 n/a n/a 0.00 n/a
What's the all-time high for San Luis Obispo on 12/21?
For the date of Dec 21, the highest temperature ever reached in San Luis Obispo history is 80 °F which has happened 2 times, most recently in 2020.
Highest Temperatures in San Luis Obispo on December 21
Rank Temperature Year
1 80 °F 2020
1 80 °F 1985
3 76 °F 1999
3 76 °F 1994
5 75 °F 1980
5 75 °F 1956
7 74 °F 1962
7 74 °F 1954
9 73 °F 1961
9 73 °F 2016
What's the all-time low for San Luis Obispo on 12/21?
For the date of Dec 21, the lowest temperature ever reached in San Luis Obispo history is 30 °F which has happened 4 times, most recently in 2012.
Lowest Temperatures in San Luis Obispo on December 21
Rank Temperature Year
1 30 °F 1990
1 30 °F 1998
1 30 °F 1967
1 30 °F 2012
5 31 °F 1928
6 32 °F 1930
6 32 °F 1971
8 33 °F 2006
9 34 °F 1992
9 34 °F 2000
9 34 °F 2011
9 34 °F 2017
9 34 °F 1968
Lowest High Temperatures in San Luis Obispo on December 21
Rank Temperature Year
1 46 °F 1968
2 47 °F 1998
3 48 °F 1990
4 49 °F 1949
5 50 °F 1932
6 52 °F 1967
7 53 °F 1970
7 53 °F 2002
9 56 °F 1927
10 57 °F 1952
10 57 °F 1951
10 57 °F 1984
What's the most it has ever rained in San Luis Obispo on 12/21?
For the date of Dec 21, the most precipitation ever recorded in San Luis Obispo history is 2.25 inches which happened in 1970.
All-Time Most Precipitation in San Luis Obispo on December 21
Rank Precipitation Year
1 2.25 inches 1970
2 2.13 inches 1931
3 1.29 inches 1947
4 1.02 inches 1988
5 0.76 inches 1909
6 0.47 inches 2002
7 0.40 inches 1943
8 0.30 inches 1927
9 0.29 inches 2010
10 0.22 inches 1964
Weather Station Details
Years Station Coordinates
1999–2024 San Luis Obispo Airport location
1893–1998 San Luis Obispo Poly location
Notes
1: Daily averages are a moving average which includes 14 days before and after the date.
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