985  
CDUS41 KLWX 110528  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
128 AM EDT SAT MAY 11 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 10 2019
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2019  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 80 128 PM 90 1963 74 6 82  
MINIMUM 64 1152 PM 31 1983 49 15 56  
1966  
AVERAGE 72 61 11 69  
 
PRECIPITATION (IN)  
YESTERDAY 0.37 1.61 1990 0.15 0.22 T  
MONTH TO DATE 2.57 1.35 1.22 0.24  
SINCE MAR 1 9.94 8.20 1.74 5.58  
SINCE JAN 1 17.40 13.62 3.78 11.97  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 26.5 22.0 4.5  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 5 -5 0  
MONTH TO DATE 6 61 -55 14  
SINCE MAR 1 888 1043 -155 1203  
SINCE JUL 1 4393 4633 -240 4554  
 
COOLING  
YESTERDAY 7 2 5 4  
MONTH TO DATE 31 11 20 30  
SINCE MAR 1 53 31 22 45  
SINCE JAN 1 53 31 22 50    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 9.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 1000 PM  
LOWEST 58 100 PM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 1993  
MINIMUM TEMPERATURE (F) 50 29 1966  
 
 
SUNRISE AND SUNSET  
MAY 11 2019...........SUNRISE 601 AM EDT SUNSET 812 PM EDT  
MAY 12 2019...........SUNRISE 600 AM EDT SUNSET 813 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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