581  
CDUS41 KLWX 210523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT MON JUN 21 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JUNE 20 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 91 3:11 PM 97 1964 85 6 80  
MINIMUM 66 5:06 AM 48 2000 63 3 64  
AVERAGE 79 74 5 72  
 
PRECIPITATION (IN)  
YESTERDAY T 1.49 1962 0.13 -0.13 T  
MONTH TO DATE 2.81 2.89 -0.08 4.19  
SINCE JUN 1 2.81 2.89 -0.08 4.19  
SINCE JAN 1 16.39 20.13 -3.74 20.71  
 
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 1 11 -10 5  
SINCE JUN 1 1 11 -10 5  
SINCE JUL 1 4153 4603 -450 4154  
 
COOLING  
YESTERDAY 14 9 5 7  
MONTH TO DATE 189 135 54 152  
SINCE JUN 1 189 135 54 152  
SINCE JAN 1 298 241 57 229    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION S (190)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION S (190)  
AVERAGE WIND SPEED 5.7  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 5:00 AM  
LOWEST 48 1:00 PM  
AVERAGE 73  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 85 98 1988  
MINIMUM TEMPERATURE (F) 64 49 1992  
 
SUNRISE AND SUNSET  
JUNE 21 2021..........SUNRISE 5:45 AM EDT SUNSET 8:39 PM EDT  
JUNE 22 2021..........SUNRISE 5:45 AM EDT SUNSET 8:39 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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