481  
CDUS41 KLWX 280522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT FRI MAY 28 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 27 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 85 4:54 PM 92 1965 78 7 80  
2010  
MINIMUM 64 5:19 AM 37 1972 56 8 61  
AVERAGE 75 67 8 71  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.45 1968 0.15 -0.15 T  
MONTH TO DATE 2.01 4.10 -2.09 2.25  
SINCE MAR 1 6.56 11.07 -4.51 9.80  
SINCE JAN 1 12.72 16.62 -3.90 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 117 108 9 175  
SINCE MAR 1 932 1075 -143 1005  
SINCE JUL 1 4125 4585 -460 4149  
 
COOLING  
YESTERDAY 10 4 6 6  
MONTH TO DATE 81 67 14 41  
SINCE MAR 1 107 89 18 44  
SINCE JAN 1 107 89 18 44    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 15 HIGHEST WIND DIRECTION NW (310)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 7.0  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 4:00 AM  
LOWEST 37 2:00 PM  
AVERAGE 58  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 78 90 1991  
2012  
2019  
MINIMUM TEMPERATURE (F) 57 37 1994  
 
SUNRISE AND SUNSET  
MAY 28 2021...........SUNRISE 5:48 AM EDT SUNSET 8:27 PM EDT  
MAY 29 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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