354  
CDUS46 KSGX 210928  
CLIONT  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE SAN DIEGO, CA  
228 AM PDT WED MAY 21 2025  
   
...............................
 
 
   
..THE ONTARIO INTL AIRPORT CA CLIMATE SUMMARY FOR MAY 20 2025
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1998 TO 2025  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 94 2:04 PM 98 2000 80 14 71  
MINIMUM 59 1:50 PM 51 2011 56 3 55  
AVERAGE 77 68 9 63  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.20 2002 0.01 -0.01 T  
MONTH TO DATE 0.25 0.24 0.01 0.15  
SINCE JUL 1 6.12 11.56 -5.44 19.80  
SINCE OCT 1 6.12 11.38 -5.26 17.64  
SINCE JAN 1 5.97 8.28 -2.31 16.29  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 1 -1 2  
MONTH TO DATE 32 29 3 24  
SINCE MAR 1 376 306 70 414  
SINCE JUL 1 1134 1280 -146 1302  
 
COOLING  
YESTERDAY 12 4 8 0  
MONTH TO DATE 88 70 18 20  
SINCE MAR 1 145 150 -5 45  
SINCE JAN 1 164 163 1 45    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 5 RESULTANT WIND DIRECTION SW (240)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION W (260)  
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 5.6  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 67 2:00 AM  
LOWEST 18 3:00 PM  
AVERAGE 43  
   
......................................................
 
 
THE ONTARIO INTL AIRPORT CA CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 101 2000  
MINIMUM TEMPERATURE (F) 56 47 2002  
 
SUNRISE AND SUNSET  
MAY 21 2025...........SUNRISE 5:45 AM PDT SUNSET 7:50 PM PDT  
MAY 22 2025...........SUNRISE 5:44 AM PDT SUNSET 7:51 PM PDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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