534  
CDUS41 KLWX 270523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU MAY 27 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 26 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 92R 3:51 PM 92 2007 77 15 81  
MINIMUM 68 10:42 PM 38 1967 56 12 55  
AVERAGE 80 67 13 68  
 
PRECIPITATION (IN)  
YESTERDAY 0.45 3.59 2009 0.15 0.30 0.00  
MONTH TO DATE 2.01 3.95 -1.94 2.25  
SINCE MAR 1 6.56 10.92 -4.36 9.80  
SINCE JAN 1 12.72 16.47 -3.75 16.37  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 117 106 11 175  
SINCE MAR 1 932 1073 -141 1005  
SINCE JUL 1 4125 4583 -458 4149  
 
COOLING  
YESTERDAY 15 4 11 3  
MONTH TO DATE 71 63 8 35  
SINCE MAR 1 97 85 12 38  
SINCE JAN 1 97 85 12 38    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 30 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 36 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 6.4  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 4:00 AM  
LOWEST 43 3:00 PM  
AVERAGE 68  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 92 1965  
2010  
MINIMUM TEMPERATURE (F) 56 37 1972  
 
SUNRISE AND SUNSET  
MAY 27 2021...........SUNRISE 5:48 AM EDT SUNSET 8:26 PM EDT  
MAY 28 2021...........SUNRISE 5:48 AM EDT SUNSET 8:27 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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