040  
CDUS43 KLOT 210632  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
131 AM CDT FRI JUL 21 2017  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR JULY 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 88 130 PM 101 1980 84 4 88  
MINIMUM 69 721 AM 53 1970 64 5 69  
AVERAGE 79 74 5 79  
 
PRECIPITATION (IN)  
YESTERDAY 1.77 3.03 1978 0.12 1.65 0.00  
MONTH TO DATE 5.35 2.23 3.12 2.37  
SINCE JUN 1 8.79 5.68 3.11 5.22  
SINCE JAN 1 26.90 18.76 8.14 18.86  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 MM 0.0 0.0 0.0  
MONTH TO DATE T 0.0 0.0 0.0  
SINCE JUN 1 T 0.0 0.0 0.0  
SINCE JUL 1 T 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 3 48 -45 13  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 14 9 5 14  
MONTH TO DATE 193 179 14 183  
SINCE JUN 1 423 344 79 399  
SINCE JAN 1 456 398 58 473    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 32 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 7.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 100 AM  
LOWEST 63 1200 PM  
AVERAGE 77  
   
......................................................
 
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 103 1901  
MINIMUM TEMPERATURE (F) 64 51 1970  
 
 
SUNRISE AND SUNSET  
JULY 21 2017..........SUNRISE 535 AM CDT SUNSET 821 PM CDT  
JULY 22 2017..........SUNRISE 536 AM CDT SUNSET 820 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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