390  
CDUS41 KLWX 232125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
525 PM EDT SUN MAY 23 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 23 2021
 
 
VALID TODAY AS OF 0500 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 92R 3:59 PM 92 1964 77 15 83  
MINIMUM 63 3:25 AM 39 1971 55 8 60  
1990  
2002  
AVERAGE 78 66 12 72  
 
PRECIPITATION (IN)  
TODAY 0.00 2.40 2010 0.16 -0.16 0.23  
MONTH TO DATE 1.03 3.48 -2.45 2.25  
SINCE MAR 1 5.58 10.45 -4.87 9.80  
SINCE JAN 1 11.74 16.00 -4.26 16.37  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 0 3 -3 0  
MONTH TO DATE 117 99 18 175  
SINCE MAR 1 932 1066 -134 1005  
SINCE JUL 1 4125 4576 -451 4149  
 
COOLING  
TODAY 13 4 9 7  
MONTH TO DATE 48 51 -3 28  
SINCE MAR 1 74 73 1 31  
SINCE JAN 1 74 73 1 31    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 8.5  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 4:00 AM  
LOWEST 36 3:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 90 1964  
MINIMUM TEMPERATURE (F) 55 36 1963  
 
SUNRISE AND SUNSET  
MAY 23 2021...........SUNRISE 5:51 AM EDT SUNSET 8:23 PM EDT  
MAY 24 2021...........SUNRISE 5:50 AM EDT SUNSET 8:24 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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