230  
CDUS41 KLWX 180533  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
131 AM EDT SAT MAY 18 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 17 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 82 333 PM 93 1960 75 7 69  
MINIMUM 51 346 AM 30 1984 51 0 64  
AVERAGE 67 63 4 67  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.22 1970 0.16 -0.16 0.92  
MONTH TO DATE 4.01 2.42 1.59 4.11  
SINCE MAR 1 11.38 9.27 2.11 9.45  
SINCE JAN 1 18.84 14.69 4.15 15.84  
 
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 4 -4 0  
MONTH TO DATE 52 92 -40 14  
SINCE MAR 1 934 1074 -140 1203  
SINCE JUL 1 4439 4664 -225 4554  
 
COOLING  
YESTERDAY 2 2 0 2  
MONTH TO DATE 33 25 8 70  
SINCE MAR 1 55 45 10 85  
SINCE JAN 1 55 45 10 90    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 22 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 4.4  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 200 AM  
LOWEST 51 200 PM  
AVERAGE 74  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 76 91 1987  
MINIMUM TEMPERATURE (F) 52 33 1973  
 
 
SUNRISE AND SUNSET  
MAY 18 2019...........SUNRISE 555 AM EDT SUNSET 818 PM EDT  
MAY 19 2019...........SUNRISE 554 AM EDT SUNSET 819 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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