Climatological Report (Daily)
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CDUS43 KLOT 140633
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1231 AM CST THU DEC 14 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 13 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         38    213 PM  67    1975  35      3       22
  MINIMUM         22    304 AM -13    1903  21      1        2
  AVERAGE         30                        28      2       12

PRECIPITATION (IN)
  YESTERDAY        T             1.14 1928   0.08  -0.08      T
  MONTH TO DATE    0.28                      1.12  -0.84     1.07
  SINCE DEC 1      0.28                      1.12  -0.84     1.07
  SINCE JAN 1     42.79                     35.76   7.03    35.27

SNOWFALL (IN)
  YESTERDAY        T             6.0  2000   0.2   -0.2      0.1
                                      1885
  MONTH TO DATE    2.0                       2.9   -0.9     14.3
  SINCE DEC 1      2.0                       2.9   -0.9     14.3
  SINCE JUL 1      2.1                       4.3   -2.2     14.3
  SNOW DEPTH       1

DEGREE DAYS
 HEATING
  YESTERDAY       35                        37     -2       53
  MONTH TO DATE  403                       452    -49      493
  SINCE DEC 1    403                       452    -49      493
  SINCE JUL 1   1446                      1708   -262     1322

 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    31   HIGHEST WIND DIRECTION    NW (320)
  HIGHEST GUST SPEED    39   HIGHEST GUST DIRECTION    NW (330)
  AVERAGE WIND SPEED    16.1


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 1.0


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    69           900 PM
 LOWEST     53           800 AM
 AVERAGE    61

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   35        66      1975
 MINIMUM TEMPERATURE (F)   21        -9      1901


SUNRISE AND SUNSET
DECEMBER 14 2017......SUNRISE   712 AM CST   SUNSET   421 PM CST
DECEMBER 15 2017......SUNRISE   713 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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