234  
CDUS41 KLWX 100521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
121 AM EDT SAT JUL 10 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JULY 9 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 1:55 PM 99 1988 88 2 90  
1993  
MINIMUM 68 5:21 AM 48 1984 67 1 69  
AVERAGE 79 77 2 80  
 
PRECIPITATION (IN)  
YESTERDAY 0.63 2.23 1970 0.13 0.50 0.00  
MONTH TO DATE 2.23 1.22 1.01 1.30  
SINCE JUN 1 5.88 5.52 0.36 6.51  
SINCE JAN 1 19.46 22.76 -3.30 23.03  
 
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 15  
MONTH TO DATE 108 106 2 139  
SINCE JUN 1 402 344 58 412  
SINCE JAN 1 511 450 61 489    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 22 HIGHEST WIND DIRECTION N (20)  
HIGHEST GUST SPEED 29 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 4.7  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 2:00 AM  
LOWEST 52 2:00 PM  
AVERAGE 75  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 88 99 1988  
1993  
MINIMUM TEMPERATURE (F) 67 53 1963  
 
SUNRISE AND SUNSET  
JULY 10 2021..........SUNRISE 5:53 AM EDT SUNSET 8:37 PM EDT  
JULY 11 2021..........SUNRISE 5:54 AM EDT SUNSET 8:36 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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