978  
CDUS41 KLWX 120541  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
140 AM EDT SUN MAY 12 2019  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 11 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 66 1053 AM 90 1993 74 -8 82  
MINIMUM 56 1159 PM 29 1966 50 6 53  
AVERAGE 61 62 -1 68  
 
PRECIPITATION (IN)  
YESTERDAY 0.36 3.73 2008 0.14 0.22 0.00  
MONTH TO DATE 2.93 1.49 1.44 0.24  
SINCE MAR 1 10.30 8.34 1.96 5.58  
SINCE JAN 1 17.76 13.76 4.00 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 4 5 -1 0  
MONTH TO DATE 10 66 -56 14  
SINCE MAR 1 892 1048 -156 1203  
SINCE JUL 1 4397 4638 -241 4554  
 
COOLING  
YESTERDAY 0 2 -2 3  
MONTH TO DATE 31 13 18 33  
SINCE MAR 1 53 33 20 48  
SINCE JAN 1 53 33 20 53    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION N (20)  
HIGHEST GUST SPEED 24 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 7.5  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 1200 AM  
LOWEST 58 1100 AM  
AVERAGE 76  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 74 90 2018  
MINIMUM TEMPERATURE (F) 50 34 1969  
 
 
SUNRISE AND SUNSET  
MAY 12 2019...........SUNRISE 600 AM EDT SUNSET 813 PM EDT  
MAY 13 2019...........SUNRISE 559 AM EDT SUNSET 814 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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