480  
CDUS41 KLWX 170527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
127 AM EDT THU JUN 17 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JUNE 16 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 79 5:54 PM 96 1991 83 -4 76  
1994  
MINIMUM 61 5:06 AM 47 1978 62 -1 62  
AVERAGE 70 73 -3 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.82 2016 0.14 -0.14 0.00  
MONTH TO DATE 2.75 2.35 0.40 3.37  
SINCE JUN 1 2.75 2.35 0.40 3.37  
SINCE JAN 1 16.33 19.59 -3.26 19.89  
 
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 JUN 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 11 -11 5  
SINCE JUN 1 0 11 -11 5  
SINCE JUL 1 4152 4603 -451 4154  
 
COOLING  
YESTERDAY 5 8 -3 4  
MONTH TO DATE 158 101 57 124  
SINCE JUN 1 158 101 57 124  
SINCE JAN 1 267 207 60 201    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 8.6  
 
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 2:00 AM  
LOWEST 29 4:00 PM  
AVERAGE 54  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 84 92 1994  
MINIMUM TEMPERATURE (F) 63 46 1980  
 
SUNRISE AND SUNSET  
JUNE 17 2021..........SUNRISE 5:44 AM EDT SUNSET 8:38 PM EDT  
JUNE 18 2021..........SUNRISE 5:44 AM EDT SUNSET 8:38 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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