806  
CDUS41 KLWX 220525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
125 AM EDT TUE MAY 22 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 21 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 82 222 PM 92 1996 76 6 67  
MINIMUM 63 148 AM 33 1992 53 10 57  
AVERAGE 73 64 9 62  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.06 2003 0.16 -0.16 T  
MONTH TO DATE 5.67 3.03 2.64 4.85  
SINCE MAR 1 11.01 9.88 1.13 12.01  
SINCE JAN 1 17.40 15.30 2.10 15.45  
 
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 3 -3 3  
MONTH TO DATE 21 106 -85 129  
SINCE MAR 1 1210 1088 122 948  
SINCE JUL 1 4561 4678 -117 3841  
 
COOLING  
YESTERDAY 8 3 5 0  
MONTH TO DATE 90 36 54 50  
SINCE MAR 1 105 56 49 119  
SINCE JAN 1 110 56 54 119    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 14 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 4.9  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 200 AM  
LOWEST 54 1200 PM  
AVERAGE 77  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 77 88 2004  
1984  
1975  
MINIMUM TEMPERATURE (F) 53 31 2002  
 
 
SUNRISE AND SUNSET  
MAY 22 2018...........SUNRISE 552 AM EDT SUNSET 822 PM EDT  
MAY 23 2018...........SUNRISE 551 AM EDT SUNSET 823 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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