686  
CDUS41 KLWX 100531  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
130 AM EDT FRI MAY 10 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 9 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 77 325 PM 91 1963 73 4 78  
MINIMUM 59 604 AM 30 1976 49 10 46  
AVERAGE 68 61 7 62  
 
PRECIPITATION (IN)  
YESTERDAY T 0.93 1974 0.14 -0.14 0.00  
MONTH TO DATE 2.20 1.20 1.00 0.24  
SINCE MAR 1 9.57 8.05 1.52 5.58  
SINCE JAN 1 17.03 13.47 3.56 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 3  
MONTH TO DATE 6 56 -50 14  
SINCE MAR 1 888 1038 -150 1203  
SINCE JUL 1 4393 4628 -235 4554  
 
COOLING  
YESTERDAY 3 1 2 0  
MONTH TO DATE 24 9 15 26  
SINCE MAR 1 46 29 17 41  
SINCE JAN 1 46 29 17 46    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION SE (140)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION SE (140)  
AVERAGE WIND SPEED 8.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
HAZE  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 800 AM  
LOWEST 64 200 PM  
AVERAGE 77  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 1963  
MINIMUM TEMPERATURE (F) 49 31 1983  
1966  
 
 
SUNRISE AND SUNSET  
MAY 10 2019...........SUNRISE 602 AM EDT SUNSET 811 PM EDT  
MAY 11 2019...........SUNRISE 601 AM EDT SUNSET 812 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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