466  
CDUS41 KLWX 200521  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1221 AM EST WED JAN 20 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 19 2021
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 51 3:08 PM 65 1972 42 9 43  
MINIMUM 26 11:01 PM -6 1994 24 2 25  
AVERAGE 39 33 6 34  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.36 1987 0.09 -0.09 0.04  
MONTH TO DATE 1.25 1.59 -0.34 1.79  
SINCE DEC 1 7.06 4.55 2.51 4.76  
SINCE JAN 1 1.25 1.59 -0.34 1.79  
 
SNOWFALL (IN)  
YESTERDAY 0.0 4.3 1978 0.3 -0.3 T  
MONTH TO DATE T 4.0 -4.0 2.3  
SINCE DEC 1 2.4 7.5 -5.1 2.9  
SINCE JUL 1 2.4 8.0 -5.6 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 26 32 -6 31  
MONTH TO DATE 518 608 -90 448  
SINCE DEC 1 1320 1490 -170 1248  
SINCE JUL 1 1987 2406 -419 2111  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 0 0 0 0    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 21 HIGHEST WIND DIRECTION W (280)  
HIGHEST GUST SPEED 31 HIGHEST GUST DIRECTION NW (300)  
AVERAGE WIND SPEED 6.6  
 
SKY COVER  
AVERAGE SKY COVER 0.5  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 66 2:00 AM  
LOWEST 22 4:00 PM  
AVERAGE 44  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 63 2006  
MINIMUM TEMPERATURE (F) 24 -7 1985  
 
SUNRISE AND SUNSET  
JANUARY 20 2021.......SUNRISE 7:25 AM EST SUNSET 5:18 PM EST  
JANUARY 21 2021.......SUNRISE 7:24 AM EST SUNSET 5:19 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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