December 2012 Temperature Data for Sioux City | Date | Observed High (F) | Observed Low (F) | Normal High (F) | Normal Low (F) | Record High (F) | Year | Record Low (F) | Year |
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| 1 | 56 | 27 | 37 | 18 | 70 | 1998 | -8 | 1896 | | 2 | 58 | 23 | 37 | 17 | 62 | 1998 | -7 | 1942 | | 3 | 60 | 30 | 36 | 17 | 61 | 1998 | -9 | 1919 | | 4 | 53 | 20 | 36 | 16 | 59 | 1916 | -9 | 1978 | | 5 | 54 | 22 | 35 | 16 | 63 | 1939 | -9 | 2005 | | 6 | 52 | 39 | 35 | 16 | 71 | 1939 | -16 | 2005 | | 7 | 40 | 28 | 34 | 15 | 68 | 1984 | -11 | 1976 | | 8 | 35 | 26 | 34 | 15 | 64 | 1970 | -19 | 1978 | | 9 | 36 | 10 | 33 | 14 | 63 | 1957 | -16 | 1958 | | 10 | 27 | 3 | 33 | 14 | 68 | 1890 | -16 | 1919 | | 11 | 42 | 19 | 33 | 14 | 60 | 1946 | -10 | 1989 | | 12 | 53 | 29 | 32 | 14 | 60 | 1921 | -15 | 1932 | | 13 | 42 | 19 | 32 | 13 | 64 | 1921 | -21 | 1917 | | 14 | 49 | 16 | 32 | 13 | 59 | 1998 | -22 | 1901 | | 15 | 43 | 30 | 32 | 13 | 62 | 1939 | -20 | 1901 | | 16 | 30 | 25 | 31 | 13 | 64 | 1962 | -15 | 1989 | | 17 | 30 | 24 | 31 | 12 | 61 | 1980 | -14 | 2008 | | 18 | 38 | 23 | 31 | 12 | 60 | 1976 | -19 | 1983 | | 19 | 42 | 23 | 31 | 12 | 54 | 1979 | -19 | 1983 | | 20 | 23 | 11 | 31 | 12 | 56 | 1900 | -17 | 1961 | | 21 | 21 | 3 | 31 | 12 | 60 | 1941 | -22 | 1989 | | 22 | 32 | 13 | 30 | 11 | 61 | 1933 | -24 | 1989 | | 23 | 21 | 9 | 30 | 11 | 58 | 1950 | -24 | 1989 | | 24 | 18 | 5 | 30 | 11 | 62 | 1889 | -18 | 1983 | | 25 | 13 | 2 | 30 | 11 | 56 | 1963 | -13 | 1983 | | 26 | 18 | -2 | 30 | 11 | 56 | 1959 | -16 | 1951 | | 27 | 21 | 7 | 30 | 11 | 57 | 1928 | -19 | 1924 | | 28 | 21 | 8 | 30 | 11 | 60 | 2002 | -20 | 1924 | | 29 | 19 | -4 | 30 | 11 | 61 | 1999 | -28 | 1917 | | 30 | 34 | 0 | 30 | 10 | 66 | 2004 | -16 | 1968 | | 31 | | | 30 | 10 | 60 | 1904 | -19 | 1968 | Avg High/Low | 36 | 16 | 32 | 13 |   |
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The highest and lowest observed and record temperatures for the month are highlighted with a white background.
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(Data listed above is unofficial and may contain errors. For official climate records, please contact the National Climatic Data Center.)