Climatological Report (Daily)
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CDUS43 KLOT 290642
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1238 AM CST FRI DEC 29 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 28 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         15   1158 AM  69    1984  32    -17       45
  MINIMUM          0    339 AM -13    1924  18    -18       19
  AVERAGE          8                        25    -17       32

PRECIPITATION (IN)
  YESTERDAY        0.03          1.47 2015   0.06  -0.03     0.00
  MONTH TO DATE    0.51                      2.07  -1.56     1.77
  SINCE DEC 1      0.51                      2.07  -1.56     1.77
  SINCE JAN 1     43.02                     36.71   6.31    35.97

SNOWFALL (IN)
  YESTERDAY        0.6           8.0  1987   0.3    0.3      0.0
  MONTH TO DATE    4.5                       7.2   -2.7     17.7
  SINCE DEC 1      4.5                       7.2   -2.7     17.7
  SINCE JUL 1      4.6                       8.6   -4.0     17.7
  SNOW DEPTH       1

DEGREE DAYS
 HEATING
  YESTERDAY       57                        40     17       33
  MONTH TO DATE  995                      1033    -38     1132
  SINCE DEC 1    995                      1033    -38     1132
  SINCE JUL 1   2038                      2289   -251     1961

 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    17   HIGHEST WIND DIRECTION     S (190)
  HIGHEST GUST SPEED    22   HIGHEST GUST DIRECTION     S (200)
  AVERAGE WIND SPEED     7.8


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    79          1200 AM
 LOWEST     55          1200 PM
 AVERAGE    67

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   32        63      1984
 MINIMUM TEMPERATURE (F)   18       -15      1880


SUNRISE AND SUNSET
DECEMBER 29 2017......SUNRISE   719 AM CST   SUNSET   429 PM CST
DECEMBER 30 2017......SUNRISE   719 AM CST   SUNSET   429 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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