143  
CDUS41 KLWX 220526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST TUE DEC 22 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 21 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 45 3:05 PM 70 2013 44 1 39  
MINIMUM 35 7:49 PM 4 1989 26 9 22  
AVERAGE 40 35 5 31  
 
PRECIPITATION (IN)  
YESTERDAY 0.02 1.15 1973 0.09 -0.07 0.00  
MONTH TO DATE 3.56 2.12 1.44 2.34  
SINCE DEC 1 3.56 2.12 1.44 2.34  
SINCE JAN 1 47.21 40.70 6.51 40.18  
 
SNOWFALL (IN)  
YESTERDAY 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  
YESTERDAY 25 30 -5 34  
MONTH TO DATE 539 574 -35 583  
SINCE DEC 1 539 574 -35 583  
SINCE JUL 1 1206 1490 -284 1446  
 
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 9 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 12 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 3.0  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
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 TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 44 71 2013  
MINIMUM TEMPERATURE (F) 26 2 1989  
 
SUNRISE AND SUNSET  
DECEMBER 22 2020......SUNRISE 7:26 AM EST SUNSET 4:52 PM EST  
DECEMBER 23 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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