227  
CDUS41 KLWX 070523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT FRI MAY 07 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 6 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 65 5:26 PM 90 1986 73 -8 57  
MINIMUM 45 4:55 AM 36 1968 50 -5 46  
AVERAGE 55 61 -6 52  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 0.92 2016 0.15 -0.15 0.27  
MONTH TO DATE 0.79 0.86 -0.07 1.41  
SINCE MAR 1 5.34 7.83 -2.49 8.96  
SINCE JAN 1 11.50 13.38 -1.88 15.53  
 
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 10 5 5 13  
MONTH TO DATE 17 34 -17 40  
SINCE MAR 1 832 1001 -169 870  
SINCE JUL 1 4025 4511 -486 4014  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 17 8 9 4  
SINCE MAR 1 43 30 13 7  
SINCE JAN 1 43 30 13 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION N (340)  
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 86 11:00 PM  
LOWEST 37 4:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 90 1986  
2000  
MINIMUM TEMPERATURE (F) 50 28 1970  
 
SUNRISE AND SUNSET  
MAY 7 2021...........SUNRISE 6:05 AM EDT SUNSET 8:08 PM EDT  
MAY 8 2021...........SUNRISE 6:04 AM EDT SUNSET 8:09 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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