505  
CDUS41 KLWX 010537  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
137 AM EDT FRI JUN 1 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 31 2018
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1960 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 83 301 PM 94 2011 79 4 83  
1991  
MINIMUM 68 546 AM 37 1984 56 12 59  
AVERAGE 76 68 8 71  
 
PRECIPITATION (IN)  
YESTERDAY 2.35R 1.15 1979 0.15 2.20 0.60  
MONTH TO DATE 8.92 4.55 4.37 8.49  
SINCE MAR 1 14.26 11.40 2.86 15.65  
SINCE JAN 1 20.65 16.82 3.83 19.09  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0  
SINCE JUL 1 11.9 22.0 -10.1  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 21 131 -110 140  
SINCE MAR 1 1210 1112 98 959  
SINCE JUL 1 4561 4702 -141 3852  
 
COOLING  
YESTERDAY 11 4 7 6  
MONTH TO DATE 172 72 100 68  
SINCE MAR 1 187 92 95 137  
SINCE JAN 1 192 92 100 137    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 25 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 7.1  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 1.0  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 1200 AM  
LOWEST 74 300 PM  
AVERAGE 87  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 80 95 2011  
MINIMUM TEMPERATURE (F) 57 39 1984  
 
 
SUNRISE AND SUNSET  
JUNE 1 2018..........SUNRISE 546 AM EDT SUNSET 829 PM EDT  
JUNE 2 2018..........SUNRISE 546 AM EDT SUNSET 830 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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