Climatological Report (Daily)
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000
CDUS43 KLOT 180645
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
1244 AM CST THU DEC 18 2014


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 17 2014...

CLIMATE NORMAL PERIOD 1981 TO 2010
CLIMATE RECORD PERIOD 1871 TO 2014


WEATHER ITEM   OBSERVED TIME   RECORD YEAR NORMAL DEPARTURE LAST
                VALUE   (LST)  VALUE       VALUE  FROM      YEAR
                                                  NORMAL
..................................................................
TEMPERATURE (F)
 YESTERDAY
  MAXIMUM         29   1243 AM  60    1977  34     -5       33
  MINIMUM         24   1159 PM  -7    1951  20      4       16
  AVERAGE         27                        27      0       25

PRECIPITATION (IN)
  YESTERDAY        T             1.28 1921   0.06  -0.06     0.01
  MONTH TO DATE    0.28                      1.39  -1.11     0.70
  SINCE DEC 1      0.28                      1.39  -1.11     0.70
  SINCE JAN 1     38.96                     36.03   2.93    40.85

SNOWFALL (IN)
  YESTERDAY        T             4.6  1951   0.3   -0.3      0.2
  MONTH TO DATE    T                         4.1   -4.1      9.3
  SINCE DEC 1      T                         4.1   -4.1      9.3
  SINCE JUL 1      2.9                       5.5   -2.6     10.2
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY       38                        38      0       40
  MONTH TO DATE  541                       602    -61      712
  SINCE DEC 1    541                       602    -61      712
  SINCE JUL 1   1984                      1858    126     1995

 COOLING
  YESTERDAY        0                         0      0        0
  MONTH TO DATE    0                         0      0        0
  SINCE DEC 1      0                         0      0        0
  SINCE JAN 1    799                       843    -44      933
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    20   HIGHEST WIND DIRECTION     W (290)
  HIGHEST GUST SPEED    24   HIGHEST GUST DIRECTION     W (290)
  AVERAGE WIND SPEED    11.2


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 1.0


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  LIGHT SNOW


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    81           300 AM
 LOWEST     63           300 PM
 AVERAGE    72

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


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


SUNRISE AND SUNSET
DECEMBER 18 2014......SUNRISE   714 AM CST   SUNSET   422 PM CST
DECEMBER 19 2014......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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