719  
CDUS41 KLWX 220523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST SAT DEC 22 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 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 66 253 PM 70 2013 44 22 45  
MINIMUM 42 1159 PM 4 1989 26 16 21  
AVERAGE 54 35 19 33  
 
PRECIPITATION (IN)  
YESTERDAY 0.35 1.15 1973 0.09 0.26 0.00  
MONTH TO DATE 4.09 2.12 1.97 0.39  
SINCE DEC 1 4.09 2.12 1.97 0.39  
SINCE JAN 1 65.07 40.70 24.37 40.28  
 
SNOWFALL (IN)  
YESTERDAY 0.0 5.8 1962 0.1 -0.1  
MONTH TO DATE T 2.1 -2.1  
SINCE JUL 1 3.0 2.6 0.4  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 11 30 -19 32  
MONTH TO DATE 550 574 -24 572  
SINCE DEC 1 550 574 -24 572  
SINCE JUL 1 1508 1490 18 1366  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1522 1178 344 1281    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 35 HIGHEST WIND DIRECTION SW (210)  
HIGHEST GUST SPEED 50 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED 11.6  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 600 PM  
LOWEST 68 300 PM  
AVERAGE 84  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 2013  
MINIMUM TEMPERATURE (F) 26 2 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 22 2018......SUNRISE 725 AM EST SUNSET 451 PM EST  
DECEMBER 23 2018......SUNRISE 726 AM EST SUNSET 452 PM EST  
 
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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