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000
CDUS43 KLOT 172246
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
444 PM CST SUN DEC 17 2017


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

...THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR DECEMBER 17 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         42    342 PM  60    1977  34      8       22
  MINIMUM         29    252 AM  -7    1951  20      9       18
  AVERAGE         36                        27      9       20

PRECIPITATION (IN)
  TODAY            0.00          1.28 1921   0.06  -0.06     0.12
  MONTH TO DATE    0.28                      1.39  -1.11     1.32
  SINCE DEC 1      0.28                      1.39  -1.11     1.32
  SINCE JAN 1     42.79                     36.03   6.76    35.52

SNOWFALL (IN)
  TODAY            0.0           4.6  1951   0.3   -0.3      1.7
  MONTH TO DATE    2.0                       4.1   -2.1     17.2
  SINCE DEC 1      2.0                       4.1   -2.1     17.2
  SINCE JUL 1      2.1                       5.5   -3.4     17.2

DEGREE DAYS
 HEATING
  TODAY           29                        38     -9       45
  MONTH TO DATE  539                       602    -63      704
  SINCE DEC 1    539                       602    -63      704
  SINCE JUL 1   1582                      1858   -276     1533

 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    10   HIGHEST WIND DIRECTION    NE (40)
  HIGHEST GUST SPEED    12   HIGHEST GUST DIRECTION    NE (40)
  AVERAGE WIND SPEED     4.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.8


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED TODAY.
  FOG
  HAZE


RELATIVE HUMIDITY (PERCENT)
 HIGHEST   100           300 AM
 LOWEST     70           300 PM
 AVERAGE    85

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


THE CHICAGO-OHARE IL CLIMATE NORMALS FOR TOMORROW
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   34        62      1877
 MINIMUM TEMPERATURE (F)   20       -11      1983


SUNRISE AND SUNSET
DECEMBER 17 2017......SUNRISE   714 AM CST   SUNSET   422 PM CST
DECEMBER 18 2017......SUNRISE   715 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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