558  
CDUS41 KLWX 212141  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
441 PM EST MON DEC 21 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 21 2020
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
TODAY  
MAXIMUM 45 3:05 PM 70 2013 44 1 39  
MINIMUM 36 8:34 AM 4 1989 26 10 22  
AVERAGE 41 35 6 31  
 
PRECIPITATION (IN)  
TODAY T 1.15 1973 0.09 -0.09 0.00  
MONTH TO DATE 3.54 2.12 1.42 2.34  
SINCE DEC 1 3.54 2.12 1.42 2.34  
SINCE JAN 1 47.19 40.70 6.49 40.18  
 
SNOWFALL (IN)  
TODAY 0.0 5.8 1962 0.1 -0.1 0.0  
MONTH TO DATE 2.4 2.1 0.3 0.6  
SINCE DEC 1 2.4 2.1 0.3 0.6  
SINCE JUL 1 2.4 2.6 -0.2 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 24 30 -6 34  
MONTH TO DATE 538 574 -36 583  
SINCE DEC 1 538 574 -36 583  
SINCE JUL 1 1205 1490 -285 1446  
 
COOLING  
TODAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1406 1178 228 1524    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 9 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 11 HIGHEST GUST DIRECTION S (200)  
AVERAGE WIND SPEED MM  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
FOG  
FOG W/VISIBILITY <= 1/4 MILE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 5:00 AM  
LOWEST 79 4:00 PM  
AVERAGE 90  
   
......................................................
 
 
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 2020......SUNRISE 7:25 AM EST SUNSET 4:51 PM EST  
DECEMBER 22 2020......SUNRISE 7:26 AM EST SUNSET 4:52 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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