213  
CDUS41 KLWX 170523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
123 AM EDT FRI MAY 17 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 16 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 78 433 PM 90 1998 75 3 74  
MINIMUM 50 222 AM 35 2000 51 -1 65  
AVERAGE 64 63 1 70  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.97 2014 0.15 -0.14 0.29  
MONTH TO DATE 4.01 2.26 1.75 3.19  
SINCE MAR 1 11.38 9.11 2.27 8.53  
SINCE JAN 1 18.84 14.53 4.31 14.92  
 
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 1 4 -3 0  
MONTH TO DATE 52 88 -36 14  
SINCE MAR 1 934 1070 -136 1203  
SINCE JUL 1 4439 4660 -221 4554  
 
COOLING  
YESTERDAY 0 2 -2 5  
MONTH TO DATE 31 23 8 68  
SINCE MAR 1 53 43 10 83  
SINCE JAN 1 53 43 10 88    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 28 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 4.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 83 300 AM  
LOWEST 30 300 PM  
AVERAGE 57  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 75 93 1960  
MINIMUM TEMPERATURE (F) 51 30 1984  
 
 
SUNRISE AND SUNSET  
MAY 17 2019...........SUNRISE 556 AM EDT SUNSET 817 PM EDT  
MAY 18 2019...........SUNRISE 555 AM EDT SUNSET 818 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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