Climatological Report (Daily)
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000
CDUS43 KLOT 120632
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1232 AM CST TUE DEC 12 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 11 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         39    247 PM  61    1949  36      3       33
  MINIMUM         23    252 AM  -5    1972  22      1       23
  AVERAGE         31                        29      2       28

PRECIPITATION (IN)
  YESTERDAY        0.08          1.73 1949   0.09  -0.01     0.44
  MONTH TO DATE    0.28                      0.97  -0.69     1.07
  SINCE DEC 1      0.28                      0.97  -0.69     1.07
  SINCE JAN 1     42.79                     35.61   7.18    35.27

SNOWFALL (IN)
  YESTERDAY        1.4           9.5  2000   0.2    1.2      5.1
  MONTH TO DATE    2.0                       2.4   -0.4     14.2
  SINCE DEC 1      2.0                       2.4   -0.4     14.2
  SINCE JUL 1      2.1                       3.8   -1.7     14.2
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       34                        36     -2       37
  MONTH TO DATE  327                       378    -51      395
  SINCE DEC 1    327                       378    -51      395
  SINCE JUL 1   1370                      1634   -264     1224

 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    28   HIGHEST WIND DIRECTION    NW (330)
  HIGHEST GUST SPEED    35   HIGHEST GUST DIRECTION    NW (320)
  AVERAGE WIND SPEED     9.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.9


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    89           600 PM
 LOWEST     59           100 PM
 AVERAGE    74

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   35        61      1877
 MINIMUM TEMPERATURE (F)   21        -8      2000


SUNRISE AND SUNSET
DECEMBER 12 2017......SUNRISE   710 AM CST   SUNSET   420 PM CST
DECEMBER 13 2017......SUNRISE   711 AM CST   SUNSET   421 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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