914  
CDUS43 KLOT 212142  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
441 PM CDT MON AUG 21 2017  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE IL CLIMATE SUMMARY FOR AUGUST 21 2017
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 85 259 PM 99 1955 82 3 76  
MINIMUM 71 552 AM 46 1950 63 8 58  
AVERAGE 78 72 6 67  
 
PRECIPITATION (IN)  
TODAY 0.03 2.00 1874 0.15 -0.12 0.00  
MONTH TO DATE 2.08 3.45 -1.37 2.34  
SINCE JUN 1 13.20 10.60 2.60 11.42  
SINCE JAN 1 31.31 23.68 7.63 25.06  
 
SNOWFALL (IN)  
TODAY 0.0 0.0 MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 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  
 
DEGREE DAYS  
HEATING  
TODAY 0 0 0 0  
MONTH TO DATE 3 0 3 0  
SINCE JUN 1 6 52 -46 13  
SINCE JUL 1 3 4 -1 0  
 
COOLING  
TODAY 13 7 6 2  
MONTH TO DATE 171 173 -2 250  
SINCE JUN 1 707 621 86 798  
SINCE JAN 1 740 675 65 872    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION W (260)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 6.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 600 AM  
LOWEST 61 300 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE CHICAGO-OHARE IL CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 82 99 1936  
MINIMUM TEMPERATURE (F) 63 49 2004  
 
 
SUNRISE AND SUNSET  
AUGUST 21 2017........SUNRISE 606 AM CDT SUNSET 742 PM CDT  
AUGUST 22 2017........SUNRISE 607 AM CDT SUNSET 741 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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