333  
CDUS41 KLWX 200523  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1223 AM EST SUN DEC 20 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 19 2020
 
 
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)  
YESTERDAY  
MAXIMUM 36 4:38 PM 63 1967 45 -9 34  
MINIMUM 23 7:44 AM -2 1989 26 -3 19  
AVERAGE 30 35 -5 27  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.34 2009 0.09 -0.09 0.00  
MONTH TO DATE 3.54 1.95 1.59 2.34  
SINCE DEC 1 3.54 1.95 1.59 2.34  
SINCE JAN 1 47.19 40.53 6.66 40.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 16.0 2009 0.1 -0.1 0.0  
MONTH TO DATE 2.4 1.9 0.5 0.6  
SINCE DEC 1 2.4 1.9 0.5 0.6  
SINCE JUL 1 2.4 2.4 -0.0 0.6  
SNOW DEPTH 1  
 
DEGREE DAYS  
HEATING  
YESTERDAY 35 30 5 38  
MONTH TO DATE 488 514 -26 513  
SINCE DEC 1 488 514 -26 513  
SINCE JUL 1 1155 1430 -275 1376  
 
COOLING  
YESTERDAY 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 8 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION S (170)  
AVERAGE WIND SPEED 2.3  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 9:00 AM  
LOWEST 69 3:00 PM  
AVERAGE 81  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 64 1988  
MINIMUM TEMPERATURE (F) 26 8 1991  
 
SUNRISE AND SUNSET  
DECEMBER 20 2020......SUNRISE 7:25 AM EST SUNSET 4:51 PM EST  
DECEMBER 21 2020......SUNRISE 7:25 AM EST SUNSET 4:51 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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