382  
CDUS43 KLOT 190633  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
133 AM CDT THU OCT 19 2017  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR OCTOBER 18 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 71 253 PM 87 1950 62 9 76  
MINIMUM 47 445 AM 20 1948 42 5 55  
AVERAGE 59 52 7 66  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.09 1985 0.11 -0.11 0.00  
MONTH TO DATE 6.73 1.80 4.93 1.65  
SINCE SEP 1 7.05 5.01 2.04 3.41  
SINCE JAN 1 38.79 30.14 8.65 30.39  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.7 1989 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.1 -0.1 0.0  
SINCE SEP 1 0.0 0.1 -0.1 0.0  
SINCE JUL 1 T 0.1 -0.1 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 6 13 -7 0  
MONTH TO DATE 54 193 -139 88  
SINCE SEP 1 91 298 -207 111  
SINCE JUL 1 96 311 -215 111  
 
COOLING  
YESTERDAY 0 0 0 1  
MONTH TO DATE 25 10 15 24  
SINCE SEP 1 204 102 102 189  
SINCE JAN 1 987 842 145 1154    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 12.7  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.1  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 77 400 AM  
LOWEST 36 300 PM  
AVERAGE 57  
   
......................................................
 
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 61 84 1971  
MINIMUM TEMPERATURE (F) 42 21 1992  
 
 
SUNRISE AND SUNSET  
OCTOBER 19 2017.......SUNRISE 709 AM CDT SUNSET 603 PM CDT  
OCTOBER 20 2017.......SUNRISE 710 AM CDT SUNSET 602 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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