355  
CDUS41 KLWX 210526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST THU JAN 21 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 20 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 43 1:48 PM 63 2006 42 1 34  
MINIMUM 22 11:41 PM -7 1985 24 -2 22  
AVERAGE 33 33 0 28  
 
PRECIPITATION (IN)  
YESTERDAY 0.01 1.01 1979 0.09 -0.08 0.00  
MONTH TO DATE 1.26 1.68 -0.42 1.79  
SINCE DEC 1 7.07 4.64 2.43 4.76  
SINCE JAN 1 1.26 1.68 -0.42 1.79  
 
SNOWFALL (IN)  
YESTERDAY T 4.6 2000 0.3 -0.3 0.0  
MONTH TO DATE T 4.3 -4.3 2.3  
SINCE DEC 1 2.4 7.8 -5.4 2.9  
SINCE JUL 1 2.4 8.3 -5.9 2.9  
SNOW DEPTH T  
 
DEGREE DAYS  
HEATING  
YESTERDAY 32 32 0 37  
MONTH TO DATE 550 640 -90 485  
SINCE DEC 1 1352 1522 -170 1285  
SINCE JUL 1 2019 2438 -419 2148  
 
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 30 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 41 HIGHEST GUST DIRECTION W (280)  
AVERAGE WIND SPEED 10.5  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
LIGHT SNOW  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 85 5:00 AM  
LOWEST 38 4:00 PM  
AVERAGE 62  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 63 2018  
MINIMUM TEMPERATURE (F) 24 -16 1984  
 
SUNRISE AND SUNSET  
JANUARY 21 2021.......SUNRISE 7:24 AM EST SUNSET 5:19 PM EST  
JANUARY 22 2021.......SUNRISE 7:23 AM EST SUNSET 5:20 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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