799  
CDUS43 KLOT 210637  
CLIORD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE CHICAGO IL  
1237 AM CST SAT DEC 21 2024  
   
...............................
 
 
   
..THE CHICAGO-OHARE CLIMATE SUMMARY FOR DECEMBER 20 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 35 7:27 AM 67 1877 35 0 45  
MINIMUM 21 11:59 PM -9 1963 23 -2 30  
AVERAGE 28 29 -1 38  
 
PRECIPITATION (IN)  
YESTERDAY 0.08 1.67 1895 0.06 0.02 0.00  
MONTH TO DATE 0.58 1.41 -0.83 1.71  
SINCE DEC 1 0.58 1.41 -0.83 1.71  
SINCE JAN 1 33.57 37.16 -3.59 32.47  
 
SNOWFALL (IN)  
YESTERDAY 1.7 11.0 1960 0.2 1.5 0.0  
MONTH TO DATE 2.4 4.5 -2.1 0.3  
SINCE DEC 1 2.4 4.5 -2.1 0.3  
SINCE JUL 1 5.3 6.5 -1.2 3.0  
SNOW DEPTH 2  
 
DEGREE DAYS  
HEATING  
YESTERDAY 37 36 1 27  
MONTH TO DATE 704 662 42 538  
SINCE DEC 1 704 662 42 538  
SINCE JUL 1 1471 1813 -342 1502  
 
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 26 HIGHEST WIND DIRECTION N (10)  
HIGHEST GUST SPEED 35 HIGHEST GUST DIRECTION N (360)  
AVERAGE WIND SPEED 14.1  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT SNOW  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 6:00 AM  
LOWEST 66 4:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE CHICAGO-OHARE CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 35 62 1967  
MINIMUM TEMPERATURE (F) 23 -14 1989  
 
SUNRISE AND SUNSET  
DECEMBER 21 2024......SUNRISE 7:16 AM CST SUNSET 4:24 PM CST  
DECEMBER 22 2024......SUNRISE 7:17 AM CST SUNSET 4:24 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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