Climatological Report (Daily)
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000
CDUS43 KLOT 160632
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1232 AM CST SAT DEC 16 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 15 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         37   1159 PM  64    1971  35      2        9
  MINIMUM         21   1240 AM -12    1901  21      0       -2
  AVERAGE         29                        28      1        4

PRECIPITATION (IN)
  YESTERDAY        T             1.10 1971   0.07  -0.07     0.00
  MONTH TO DATE    0.28                      1.26  -0.98     1.07
  SINCE DEC 1      0.28                      1.26  -0.98     1.07
  SINCE JAN 1     42.79                     35.90   6.89    35.27

SNOWFALL (IN)
  YESTERDAY        T             8.0  1987   0.3   -0.3      0.0
  MONTH TO DATE    2.0                       3.5   -1.5     14.3
  SINCE DEC 1      2.0                       3.5   -1.5     14.3
  SINCE JUL 1      2.1                       4.9   -2.8     14.3
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       36                        37     -1       61
  MONTH TO DATE  482                       526    -44      608
  SINCE DEC 1    482                       526    -44      608
  SINCE JUL 1   1525                      1782   -257     1437

 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    25   HIGHEST WIND DIRECTION    NW (300)
  HIGHEST GUST SPEED    33   HIGHEST GUST DIRECTION     W (290)
  AVERAGE WIND SPEED    11.5


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 1.0


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    74           500 AM
 LOWEST     49          1200 PM
 AVERAGE    62

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   34        60      1984
 MINIMUM TEMPERATURE (F)   20       -12      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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