071  
CDUS41 KLWX 280521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST MON DEC 28 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 27 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 41 3:15 PM 73 1971 43 -2 57  
MINIMUM 19 4:53 AM 1 1989 25 -6 32  
AVERAGE 30 34 -4 45  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.04 1964 0.08 -0.08 T  
MONTH TO DATE 5.81 2.65 3.16 2.34  
SINCE DEC 1 5.81 2.65 3.16 2.34  
SINCE JAN 1 49.46 41.23 8.23 40.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.4 1990 0.1 -0.1 0.0  
MONTH TO DATE 2.4 2.9 -0.5 0.6  
SINCE DEC 1 2.4 2.9 -0.5 0.6  
SINCE JUL 1 2.4 3.4 -1.0 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 35 31 4 20  
MONTH TO DATE 701 758 -57 736  
SINCE DEC 1 701 758 -57 736  
SINCE JUL 1 1368 1674 -306 1599  
 
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 10 HIGHEST WIND DIRECTION SE (150)  
HIGHEST GUST SPEED 17 HIGHEST GUST DIRECTION SE (150)  
AVERAGE WIND SPEED 4.1  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 88 8:00 AM  
LOWEST 44 4:00 PM  
AVERAGE 66  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 73 1984  
MINIMUM TEMPERATURE (F) 25 8 1966  
 
SUNRISE AND SUNSET  
DECEMBER 28 2020......SUNRISE 7:28 AM EST SUNSET 4:56 PM EST  
DECEMBER 29 2020......SUNRISE 7:28 AM EST SUNSET 4:56 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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