115  
CDUS41 KLWX 220523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT THU JUL 22 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 21 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 90 1:58 PM 101 1991 88 2 97  
MINIMUM 69 5:30 AM 48 1966 67 2 73  
AVERAGE 80 78 2 85  
 
PRECIPITATION (IN)  
YESTERDAY T 5.02 2018 0.13 -0.13 0.04  
MONTH TO DATE 2.40 2.87 -0.47 1.61  
SINCE JUN 1 6.05 7.17 -1.12 6.82  
SINCE JAN 1 19.63 24.41 -4.78 23.34  
 
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 15 12 3 20  
MONTH TO DATE 293 250 43 337  
SINCE JUN 1 587 488 99 610  
SINCE JAN 1 696 594 102 687    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 23 HIGHEST WIND DIRECTION N (350)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION N (340)  
AVERAGE WIND SPEED 7.5  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 87 5:00 AM  
LOWEST 41 2:00 PM  
AVERAGE 64  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 105 2011  
MINIMUM TEMPERATURE (F) 67 50 1974  
 
SUNRISE AND SUNSET  
JULY 22 2021..........SUNRISE 6:02 AM EDT SUNSET 8:30 PM EDT  
JULY 23 2021..........SUNRISE 6:03 AM EDT SUNSET 8:29 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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