National Weather Service United States Department of Commerce

Central U.S. Severe Storms and Heavy Rain; Western Fire Weather Threats

A strong system will produce a swath of impacts. Severe storms with large hail, damaging winds, and a couple of tornadoes will be possible in the south and central Plains. Heavy rain could cause flash flooding in the Mid Mississippi Valley. Mountain snow will develop in the Rockies. Critical fire weather threats are expected across northern California and the Southwest. Read More >

                                  TRI-CITIES TN
                            DAILY NORMALS AND RECORDS
                                    DECEMBER

      MAX   MIN   AVG   HDD   CDD    PCPN    REC HIGH     REC LOW     REC PCPN

 1     53    31    42    23     0    0.12    74  1970     9  1964    1.33 1991
 2     53    31    42    23     0    0.13    75  1982    13  1960    0.80 2015
 3     53    31    42    23     0    0.13    76  1982    11  1979    1.42 1948
 4     52    31    42    24     0    0.12    76  1982    11  1940    2.66 1993
 5     52    31    41    24     0    0.13    74  2001    16  1991    0.90 1954

 6     52    31    41    24     0    0.13    73  1951    12  1984    1.17 2013
 7     51    30    41    24     0    0.12    78  1951     4  1977    1.46 2011
 8     51    30    41    24     0    0.13    77  1978    10  2006    1.22 1998
 9     51    30    40    24     0    0.14    73  1966     8  2006    1.72 1978
 10    51    30    40    25     0    0.13    76  1971     6  1937    1.95 1972

 11    50    30    40    25     0    0.14    72  2007     4  1962    1.28 1961
 12    50    30    40    25     0    0.13    75  1949    -5  1962    1.11 1956
 13    50    30    40    25     0    0.13    72  2015    -9  1962    1.18 1998
 14    50    30    40    25     0    0.13    71  2015     9  1942    1.03 1951
 15    49    29    39    26     0    0.13    75  1971     5  2010    0.82 1972

 16    49    29    39    26     0    0.12    72  2015     3  1989    1.37 2010
 17    49    29    39    26     0    0.12    69  2001     6  1989    1.11 1961
 18    49    29    39    26     0    0.12    73  1990     4  1953    1.27 2009
 19    49    29    39    26     0    0.11    68  1939     4  1963    0.79 1967
 20    48    29    39    26     0    0.12    66  1987     5  2004    1.29 1946

 21    48    29    38    27     0    0.11    74  2013     7  1996    1.59 2018
 22    48    28    38    27     0    0.12    73  2013     1  1989    1.56 2013
 23    48    28    38    27     0    0.11    68  2015    -4  1989    1.62 1990
 24    48    28    38    27     0    0.12    72  1964    -3  1989    1.36 2015
 25    48    28    38    27     0    0.10    74  1982    -6  1983    0.86 1969

 26    48    28    38    27     0    0.11    73  2015     0  1983    1.06 1973
 27    47    28    38    27     0    0.12    77  2015     8  1948    1.16 1974
 28    47    28    37    28     0    0.11    73  2015     8  2010    1.35 2018
 29    47    28    37    28     0    0.11    74  2019     9  1977    2.29 1942
 30    47    27    37    28     0    0.11    67  1990     6  1983    2.48 1969

 31    47    27    37    28     0    0.11    75  2018     5  1983    1.51 1975

 MO   49.5  29.2  39.3  795     0    3.76    78  1951    -9  1962    2.66 1993

 DATE OF OCCURANCE IN MONTH                        (7)        (13)          (4)