001  
CDUS43 KLOT 200635  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
135 AM CDT WED SEP 20 2017  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR SEPTEMBER 19 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 79 1236 PM 93 1955 74 5 88  
MINIMUM 64 1159 PM 40 1991 53 11 56  
AVERAGE 72 63 9 72  
 
PRECIPITATION (IN)  
YESTERDAY 0.07 1.72 2001 0.11 -0.04 0.00  
MONTH TO DATE 0.32 2.07 -1.75 0.59  
SINCE SEP 1 0.32 2.07 -1.75 0.59  
SINCE JAN 1 32.06 27.20 4.86 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 40 -11 1  
SINCE SEP 1 29 40 -11 1  
SINCE JUL 1 34 53 -19 1  
 
COOLING  
YESTERDAY 7 2 5 7  
MONTH TO DATE 64 76 -12 123  
SINCE SEP 1 64 76 -12 123  
SINCE JAN 1 847 816 31 1088    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NE (50)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION NE (50)  
AVERAGE WIND SPEED 6.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 300 AM  
LOWEST 56 400 PM  
AVERAGE 75  
   
......................................................
 
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 91 1931  
1895  
MINIMUM TEMPERATURE (F) 52 36 1991  
 
 
SUNRISE AND SUNSET  
SEPTEMBER 20 2017.....SUNRISE 637 AM CDT SUNSET 652 PM CDT  
SEPTEMBER 21 2017.....SUNRISE 638 AM CDT SUNSET 650 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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