486  
CDUS41 KLWX 210522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
122 AM EDT WED JUL 21 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 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 3:39 PM 101 1980 88 3 99  
MINIMUM 66 3:54 AM 55 1974 67 -1 75  
AVERAGE 79 78 1 87  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 2.28 1970 0.14 -0.14 0.01  
MONTH TO DATE 2.40 2.74 -0.34 1.57  
SINCE JUN 1 6.05 7.04 -0.99 6.78  
SINCE JAN 1 19.63 24.28 -4.65 23.30  
 
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 0.0 0.0 0.0 0.0  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE JUN 1 6 13 -7 5  
SINCE JUL 1 0 0 0 0  
 
COOLING  
YESTERDAY 14 12 2 22  
MONTH TO DATE 278 238 40 317  
SINCE JUN 1 572 476 96 590  
SINCE JAN 1 681 582 99 667    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 10 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 15 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 4.4  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 2:00 AM  
LOWEST 39 3:00 PM  
AVERAGE 66  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 101 1991  
MINIMUM TEMPERATURE (F) 67 48 1966  
 
SUNRISE AND SUNSET  
JULY 21 2021..........SUNRISE 6:02 AM EDT SUNSET 8:30 PM EDT  
JULY 22 2021..........SUNRISE 6:02 AM EDT SUNSET 8:30 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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