Climatological Report (Daily)
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CDUS43 KLOT 090633
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1233 AM CST SAT DEC 9 2017


...................................

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 8 2017...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2017


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         37    233 PM  64    1946  37      0       24
  MINIMUM         18    528 AM  -7    1882  23     -5       17
  AVERAGE         28                        30     -2       21

PRECIPITATION (IN)
  YESTERDAY        T             1.21 1885   0.09  -0.09     0.01
  MONTH TO DATE    0.16                      0.72  -0.56     0.51
  SINCE DEC 1      0.16                      0.72  -0.56     0.51
  SINCE JAN 1     42.67                     35.36   7.31    34.71

SNOWFALL (IN)
  YESTERDAY        T             6.9  1977   0.2   -0.2       T
  MONTH TO DATE    T                         1.7   -1.7      6.4
  SINCE DEC 1      T                         1.7   -1.7      6.4
  SINCE JUL 1      0.1                       3.1   -3.0      6.4
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       37                        35      2       44
  MONTH TO DATE  217                       270    -53      271
  SINCE DEC 1    217                       270    -53      271
  SINCE JUL 1   1260                      1526   -266     1100

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1    991                       843    148     1157
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    20   HIGHEST WIND DIRECTION    SW (210)
  HIGHEST GUST SPEED    26   HIGHEST GUST DIRECTION    SW (240)
  AVERAGE WIND SPEED    12.3


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.4


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  LIGHT SNOW
  HAZE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    69          1100 PM
 LOWEST     40           100 PM
 AVERAGE    55

..........................................................


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   37        62      1879
 MINIMUM TEMPERATURE (F)   22       -14      1876


SUNRISE AND SUNSET
DECEMBER  9 2017......SUNRISE   708 AM CST   SUNSET   420 PM CST
DECEMBER 10 2017......SUNRISE   709 AM CST   SUNSET   420 PM CST


-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.




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