Climatological Report (Daily)
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CDUS43 KLOT 250743
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
143 AM CST MON DEC 25 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 24 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         22   1207 PM  64    1889  33    -11       38
  MINIMUM         18   1001 PM -25    1983  19     -1       33
  AVERAGE         20                        26     -6       36

PRECIPITATION (IN)
  YESTERDAY        0.18          2.61 1965   0.06   0.12      T
  MONTH TO DATE    0.47                      1.83  -1.36     1.45
  SINCE DEC 1      0.47                      1.83  -1.36     1.45
  SINCE JAN 1     42.98                     36.47   6.51    35.65

SNOWFALL (IN)
  YESTERDAY        1.8           7.1  1918   0.3    1.5      0.0
  MONTH TO DATE    3.8                       6.0   -2.2     17.7
  SINCE DEC 1      3.8                       6.0   -2.2     17.7
  SINCE JUL 1      3.9                       7.4   -3.5     17.7
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       45                        39      6       29
  MONTH TO DATE  758                       873   -115     1005
  SINCE DEC 1    758                       873   -115     1005
  SINCE JUL 1   1801                      2129   -328     1834

 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    18   HIGHEST WIND DIRECTION     W (270)
  HIGHEST GUST SPEED    25   HIGHEST GUST DIRECTION     W (280)
  AVERAGE WIND SPEED     8.9


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.9


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


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    84          1000 AM
 LOWEST     52           700 AM
 AVERAGE    68

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   32        64      1982
 MINIMUM TEMPERATURE (F)   18       -17      1983


SUNRISE AND SUNSET
DECEMBER 25 2017......SUNRISE   718 AM CST   SUNSET   426 PM CST
DECEMBER 26 2017......SUNRISE   718 AM CST   SUNSET   426 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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