Climatological Report (Daily)
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000
CDUS43 KLOT 162239
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
437 PM CST SAT DEC 16 2017


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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR DECEMBER 16 2017...
VALID TODAY AS OF 0400 PM LOCAL TIME.

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)
 TODAY
  MAXIMUM         46    333 PM  60    1984  34     12       20
  MINIMUM         34    811 AM -12    1951  20     14        7
  AVERAGE         40                        27     13       14

PRECIPITATION (IN)
  TODAY            0.00          1.67 1921   0.07  -0.07     0.13
  MONTH TO DATE    0.28                      1.33  -1.05     1.20
  SINCE DEC 1      0.28                      1.33  -1.05     1.20
  SINCE JAN 1     42.79                     35.97   6.82    35.40

SNOWFALL (IN)
  TODAY            0.0           4.8  2008   0.3   -0.3      1.2
  MONTH TO DATE    2.0                       3.8   -1.8     15.5
  SINCE DEC 1      2.0                       3.8   -1.8     15.5
  SINCE JUL 1      2.1                       5.2   -3.1     15.5

DEGREE DAYS
 HEATING
  TODAY           25                        38    -13       51
  MONTH TO DATE  507                       564    -57      659
  SINCE DEC 1    507                       564    -57      659
  SINCE JUL 1   1550                      1820   -270     1488

 COOLING
  TODAY            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    SW (220)
  HIGHEST GUST SPEED    24   HIGHEST GUST DIRECTION    SW (220)
  AVERAGE WIND SPEED     9.8


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.6


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED TODAY.
  HAZE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    69           800 AM
 LOWEST     45           100 PM
 AVERAGE    57

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


THE CHICAGO-OHARE IL CLIMATE NORMALS FOR TOMORROW
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   34        60      1977
 MINIMUM TEMPERATURE (F)   20        -7      1951


SUNRISE AND SUNSET
DECEMBER 16 2017......SUNRISE   713 AM CST   SUNSET   421 PM CST
DECEMBER 17 2017......SUNRISE   714 AM CST   SUNSET   422 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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