476 
CXUS53 KLOT 011635
CLMORD

CLIMATE REPORT 
NATIONAL WEATHER SERVICE CHICAGO IL
1035 AM CST MON JAN 01 2024

...................................

...THE CHICAGO-OHARE CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2023...

CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1871 TO 2023

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR'S         
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)       
                                          NORMAL                       
................................................................
TEMPERATURE (F)
RECORD
 HIGH             71   12/02/1982                                      
                       12/03/1970                                      
 LOW             -25   12/24/1983                                      
HIGHEST           59   12/25                          59  12/29        
LOWEST            17   12/19                          -8  12/23        
AVG. MAXIMUM    44.2               36.6     7.6     35.7               
AVG. MINIMUM    33.8               24.4     9.4     22.5               
MEAN            39.0               30.5     8.5     29.1               
DAYS MAX >= 90     0                0.0     0.0        0               
DAYS MAX <= 32     0               10.0   -10.0       10               
DAYS MIN <= 32    16               25.4    -9.4       21               
DAYS MIN <= 0      0                1.1    -1.1        3               

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        8.56   1982                                            
 MINIMUM        0.16   1896                                            
TOTALS          2.97               2.11    0.86     2.16               
DAILY AVG.      0.10               0.07    0.03     0.07               
DAYS >= .01       12               10.6     1.4        7               
DAYS >= .10        9                4.8     4.2        3               
DAYS >= .50        2                1.2     0.8        1               
DAYS >= 1.00       0                0.3    -0.3        1               
GREATEST
 24 HR. TOTAL   0.66   12/01 TO 12/01               1.51               

SNOWFALL (INCHES)
RECORDS
 TOTAL          33.3   1951                                            
TOTALS           1.2                7.6    -6.4      3.2               
SINCE 7/1        3.9                9.6    -5.7       MM               
SNOWDEPTH AVG.     0                                   0               
DAYS >= 1.0        0                2.0    -2.0        2               
GREATEST
 SNOW DEPTH        0                                   1  12/26        
                                                          12/27        
                                                          12/28        
 24 HR TOTAL     0.9   12/31 TO 12/31                1.3               

DEGREE DAYS
HEATING TOTAL    798               1069    -271     1101               
 SINCE 7/1      1762               2220    -458       MM               
COOLING TOTAL      0                  0       0        0               
 SINCE 1/1      1145               1003     142       MM               
................................................................

WIND (MPH)
AVERAGE WIND SPEED              8.6                                    
HIGHEST WIND SPEED/DIRECTION    29/320    DATE  12/18                  
HIGHEST GUST SPEED/DIRECTION    41/260    DATE  12/09                  

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM                                       
AVERAGE SKY COVER           0.78                                       
NUMBER OF DAYS FAIR            3                                       
NUMBER OF DAYS PC              9                                       
NUMBER OF DAYS CLOUDY         19                                       

AVERAGE RH (PERCENT)     76                                            

WEATHER CONDITIONS. NUMBER OF DAYS WITH 
THUNDERSTORM              0     MIXED PRECIP               0         
HEAVY RAIN                0     RAIN                       5          
LIGHT RAIN               17     FREEZING RAIN              0          
LT FREEZING RAIN          1     HAIL                       1           
HEAVY SNOW                0     SNOW                       0         
LIGHT SNOW                5     SLEET                      0          
FOG                      16     FOG W/VIS <= 1/4 MILE      2           
HAZE                      2                                            

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

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