Climatological Report (Daily)
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000
CDUS43 KLOT 210635
CLIORD


CLIMATE REPORT
NATIONAL WEATHER SERVICE CHICAGO IL
132 AM CDT THU SEP 21 2017


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

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR SEPTEMBER 20 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         92R   329 PM  91    1931  73     19       83
                                      1895
  MINIMUM         62    227 AM  36    1991  52     10       66
  AVERAGE         77                        63     14       75

PRECIPITATION (IN)
  YESTERDAY        0.00          1.33 2001   0.11  -0.11      T
  MONTH TO DATE    0.32                      2.18  -1.86     0.59
  SINCE SEP 1      0.32                      2.18  -1.86     0.59
  SINCE JAN 1     32.06                     27.31   4.75    27.57

SNOWFALL (IN)
  YESTERDAY        0.0           0.0    MM   0.0    0.0      0.0
  MONTH TO DATE    0.0                       0.0    0.0      0.0
  SINCE SEP 1      0.0                       0.0    0.0      0.0
  SINCE JUL 1      T                         0.0    0.0      0.0
  SNOW DEPTH       0

DEGREE DAYS
 HEATING
  YESTERDAY        0                         4     -4        0
  MONTH TO DATE   29                        44    -15        1
  SINCE SEP 1     29                        44    -15        1
  SINCE JUL 1     34                        57    -23        1

 COOLING
  YESTERDAY       12                         2     10       10
  MONTH TO DATE   76                        78     -2      133
  SINCE SEP 1     76                        78     -2      133
  SINCE JAN 1    859                       818     41     1098
..................................................................


WIND (MPH)
  HIGHEST WIND SPEED    24   HIGHEST WIND DIRECTION     S (180)
  HIGHEST GUST SPEED    30   HIGHEST GUST DIRECTION     S (170)
  AVERAGE WIND SPEED    10.7


SKY COVER
  POSSIBLE SUNSHINE  MM
  AVERAGE SKY COVER 0.3


WEATHER CONDITIONS
 THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.
  FOG


RELATIVE HUMIDITY (PERCENT)
 HIGHEST    93           100 AM
 LOWEST     44           100 PM
 AVERAGE    69

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


THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY
                         NORMAL    RECORD    YEAR
 MAXIMUM TEMPERATURE (F)   73        92      1970
 MINIMUM TEMPERATURE (F)   52        39      1991
                                             1983
                                             1889


SUNRISE AND SUNSET
SEPTEMBER 21 2017.....SUNRISE   638 AM CDT   SUNSET   650 PM CDT
SEPTEMBER 22 2017.....SUNRISE   639 AM CDT   SUNSET   648 PM CDT


-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.




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