189  
CDUS43 KLOT 150633  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
1233 AM CST FRI DEC 15 2017  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 14 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 27 225 PM 66 1975 35 -8 19  
MINIMUM 16 727 AM -9 1901 21 -5 3  
AVERAGE 22 28 -6 11  
 
PRECIPITATION (IN)  
YESTERDAY T 1.43 2011 0.07 -0.07 T  
MONTH TO DATE 0.28 1.19 -0.91 1.07  
SINCE DEC 1 0.28 1.19 -0.91 1.07  
SINCE JAN 1 42.79 35.83 6.96 35.27  
 
SNOWFALL (IN)  
YESTERDAY T 10.0 1951 0.3 -0.3 T  
MONTH TO DATE 2.0 3.2 -1.2 14.3  
SINCE DEC 1 2.0 3.2 -1.2 14.3  
SINCE JUL 1 2.1 4.6 -2.5 14.3  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 43 37 6 54  
MONTH TO DATE 446 489 -43 547  
SINCE DEC 1 446 489 -43 547  
SINCE JUL 1 1489 1745 -256 1376  
 
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 20 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 8.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 74 500 AM  
LOWEST 42 300 PM  
AVERAGE 58  
   
......................................................
 
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 35 64 1971  
MINIMUM TEMPERATURE (F) 21 -12 1901  
 
 
SUNRISE AND SUNSET  
DECEMBER 15 2017......SUNRISE 713 AM CST SUNSET 421 PM CST  
DECEMBER 16 2017......SUNRISE 713 AM CST SUNSET 421 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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