966  
CDUS43 KLOT 200639  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
137 AM CDT FRI APR 20 2018  
 
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR APRIL 19 2018
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1871 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 55 245 PM 86 1985 61 -6 70  
MINIMUM 31 547 AM 22 1983 40 -9 45  
AVERAGE 43 50 -7 58  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.52 1970 0.12 -0.11 0.01  
MONTH TO DATE 2.70 2.10 0.60 2.80  
SINCE MAR 1 4.44 4.60 -0.16 6.81  
SINCE JAN 1 10.62 8.12 2.50 11.20  
 
SNOWFALL (IN)  
YESTERDAY 0.1 2.0 1888 0.0 0.1 0.0  
MONTH TO DATE 3.2 1.1 2.1 0.0  
SINCE MAR 1 5.8 6.7 -0.9 7.8  
SINCE JUL 1 36.1 36.2 -0.1 26.1  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 22 15 7 7  
MONTH TO DATE 538 349 189 215  
SINCE MAR 1 1405 1190 215 1000  
SINCE JUL 1 5863 5924 -61 4925  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 9  
SINCE MAR 1 0 1 -1 9  
SINCE JAN 1 0 1 -1 9    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION N (20)  
AVERAGE WIND SPEED 9.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.3  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 28 300 PM  
AVERAGE 64  
   
......................................................
 
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 61 87 1985  
MINIMUM TEMPERATURE (F) 40 24 1897  
 
 
SUNRISE AND SUNSET  
APRIL 20 2018.........SUNRISE 603 AM CDT SUNSET 738 PM CDT  
APRIL 21 2018.........SUNRISE 602 AM CDT SUNSET 739 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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