318  
CDUS43 KLOT 170634  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
1234 AM CST TUE DEC 17 2024  
   
...............................  
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 16 2024  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1871 TO 2024  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 51 1:47 PM 66 2021 36 15 46  
MINIMUM 37 11:59 PM -12 1951 24 13 41  
AVERAGE 44 30 14 44  
 
PRECIPITATION (IN)  
YESTERDAY 0.03 1.67 1921 0.06 -0.03 0.41  
MONTH TO DATE 0.41 1.15 -0.74 1.71  
SINCE DEC 1 0.41 1.15 -0.74 1.71  
SINCE JAN 1 33.40 36.90 -3.50 32.47  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.8 2008 0.3 -0.3 0.0  
MONTH TO DATE 0.2 3.6 -3.4 0.3  
SINCE DEC 1 0.2 3.6 -3.4 0.3  
SINCE JUL 1 3.1 5.6 -2.5 3.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 21 35 -14 21  
MONTH TO DATE 567 520 47 409  
SINCE DEC 1 567 520 47 409  
SINCE JUL 1 1334 1671 -337 1373  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1212 1003 209 1145    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION W (270)  
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION W (260)  
AVERAGE WIND SPEED 10.9  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 12:00 AM  
LOWEST 79 6:00 PM  
AVERAGE 90  
   
......................................................  
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 36 60 1977  
MINIMUM TEMPERATURE (F) 24 -7 1951  
 
SUNRISE AND SUNSET  
DECEMBER 17 2024......SUNRISE 7:14 AM CST SUNSET 4:22 PM CST  
DECEMBER 18 2024......SUNRISE 7:15 AM CST SUNSET 4:22 PM CST  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 
 
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