603  
CDUS41 KLWX 130523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU MAY 13 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 12 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 67 5:21 PM 90 2018 74 -7 62  
MINIMUM 44 3:20 AM 34 1969 52 -8 36  
AVERAGE 56 63 -7 49  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.37 1974 0.16 -0.16 0.00  
MONTH TO DATE 1.02 1.75 -0.73 1.55  
SINCE MAR 1 5.57 8.72 -3.15 9.10  
SINCE JAN 1 11.73 14.27 -2.54 15.67  
 
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 9 4 5 16  
MONTH TO DATE 80 61 19 133  
SINCE MAR 1 895 1028 -133 963  
SINCE JUL 1 4088 4538 -450 4107  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 17 20 -3 4  
SINCE MAR 1 43 42 1 7  
SINCE JAN 1 43 42 1 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 5.8  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 76 10:00 PM  
LOWEST 33 6:00 PM  
AVERAGE 55  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 92 2000  
MINIMUM TEMPERATURE (F) 52 32 1976  
 
SUNRISE AND SUNSET  
MAY 13 2021...........SUNRISE 5:59 AM EDT SUNSET 8:14 PM EDT  
MAY 14 2021...........SUNRISE 5:58 AM EDT SUNSET 8:15 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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