377  
CDUS41 KLWX 212124  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
424 PM EST FRI DEC 21 2018  
 
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 21 2018
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 66 253 PM 70 2013 44 22 45  
MINIMUM 60 513 AM 4 1989 26 34 21  
AVERAGE 63 35 28 33  
 
PRECIPITATION (IN)  
TODAY 0.19 1.15 1973 0.09 0.10 0.00  
MONTH TO DATE 3.93 2.12 1.81 0.39  
SINCE DEC 1 3.93 2.12 1.81 0.39  
SINCE JAN 1 64.91 40.70 24.21 40.28  
 
SNOWFALL (IN)  
TODAY 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  
TODAY 2 30 -28 32  
MONTH TO DATE 541 574 -33 572  
SINCE DEC 1 541 574 -33 572  
SINCE JUL 1 1499 1490 9 1366  
 
COOLING  
TODAY 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 24 HIGHEST WIND DIRECTION SE (140)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 14.8  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.9  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
LIGHT RAIN  
FOG  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 1200 AM  
LOWEST 68 300 PM  
AVERAGE 83  
   
......................................................
 
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 2013  
MINIMUM TEMPERATURE (F) 26 2 1989  
 
 
SUNRISE AND SUNSET  
DECEMBER 21 2018......SUNRISE 725 AM EST SUNSET 451 PM EST  
DECEMBER 22 2018......SUNRISE 725 AM EST SUNSET 451 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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