150  
CDUS41 KLWX 290527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT SAT MAY 29 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 28 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 74 11:27 AM 90 1991 78 -4 85  
2012  
2019  
MINIMUM 60 11:59 PM 37 1994 57 3 70  
AVERAGE 67 67 0 78  
 
PRECIPITATION (IN)  
YESTERDAY 0.26 2.16 1982 0.16 0.10 0.07  
MONTH TO DATE 2.27 4.26 -1.99 2.32  
SINCE MAR 1 6.82 11.23 -4.41 9.87  
SINCE JAN 1 12.98 16.78 -3.80 16.44  
 
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 117 110 7 175  
SINCE MAR 1 932 1077 -145 1005  
SINCE JUL 1 4125 4587 -462 4149  
 
COOLING  
YESTERDAY 2 4 -2 13  
MONTH TO DATE 83 71 12 54  
SINCE MAR 1 109 93 16 57  
SINCE JAN 1 109 93 16 57    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION N (340)  
HIGHEST GUST SPEED 19 HIGHEST GUST DIRECTION E (100)  
AVERAGE WIND SPEED 8.1  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 PM  
LOWEST 48 12:00 AM  
AVERAGE 71  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 97 1969  
MINIMUM TEMPERATURE (F) 57 40 1997  
 
SUNRISE AND SUNSET  
MAY 29 2021...........SUNRISE 5:47 AM EDT SUNSET 8:28 PM EDT  
MAY 30 2021...........SUNRISE 5:47 AM EDT SUNSET 8:28 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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