Climatological Report (Daily)
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466
CDUS43 KLOT 080633
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1232 AM CST FRI DEC 8 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 7 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         29    239 PM  64    1916  37     -8       27
  MINIMUM         19   1159 PM  -6    1882  23     -4       22
  AVERAGE         24                        30     -6       25

PRECIPITATION (IN)
  YESTERDAY        T             1.12 1980   0.09  -0.09      T
  MONTH TO DATE    0.16                      0.63  -0.47     0.50
  SINCE DEC 1      0.16                      0.63  -0.47     0.50
  SINCE JAN 1     42.67                     35.27   7.40    34.70

SNOWFALL (IN)
  YESTERDAY        T             6.9  1978   0.2   -0.2       T
  MONTH TO DATE    T                         1.5   -1.5      6.4
  SINCE DEC 1      T                         1.5   -1.5      6.4
  SINCE JUL 1      0.1                       2.9   -2.8      6.4
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       41                        35      6       40
  MONTH TO DATE  180                       235    -55      227
  SINCE DEC 1    180                       235    -55      227
  SINCE JUL 1   1223                      1491   -268     1056

 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    18   HIGHEST WIND DIRECTION     W (280)
  HIGHEST GUST SPEED    24   HIGHEST GUST DIRECTION    NW (320)
  AVERAGE WIND SPEED    12.4


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.5


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  LIGHT SNOW


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    74           300 AM
 LOWEST     42           300 PM
 AVERAGE    58

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   37        64      1946
 MINIMUM TEMPERATURE (F)   23        -7      1882


SUNRISE AND SUNSET
DECEMBER  8 2017......SUNRISE   707 AM CST   SUNSET   420 PM CST
DECEMBER  9 2017......SUNRISE   708 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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