538  
CDUS41 KLWX 212125  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
425 PM EST THU JAN 21 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 21 2021
 
 
VALID TODAY AS OF 0400 PM LOCAL TIME.  
 
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)  
TODAY  
MAXIMUM 54 3:59 PM 63 2018 43 11 35  
MINIMUM 19 3:21 AM -16 1984 24 -5 20  
AVERAGE 37 33 4 28  
 
PRECIPITATION (IN)  
TODAY 0.00 0.94 1974 0.09 -0.09 0.00  
MONTH TO DATE 1.26 1.77 -0.51 1.79  
SINCE DEC 1 7.07 4.73 2.34 4.76  
SINCE JAN 1 1.26 1.77 -0.51 1.79  
 
SNOWFALL (IN)  
TODAY 0.0 8.5 2014 0.2 -0.2 0.0  
MONTH TO DATE T 4.5 -4.5 2.3  
SINCE DEC 1 2.4 8.0 -5.6 2.9  
SINCE JUL 1 2.4 8.5 -6.1 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
TODAY 28 32 -4 37  
MONTH TO DATE 578 672 -94 522  
SINCE DEC 1 1380 1554 -174 1322  
SINCE JUL 1 2047 2470 -423 2185  
 
COOLING  
TODAY 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 15 HIGHEST WIND DIRECTION SW (240)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 5.1  
 
SKY COVER  
AVERAGE SKY COVER 0.4  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED TODAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 2:00 AM  
LOWEST 32 4:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TOMORROW  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 1986  
MINIMUM TEMPERATURE (F) 24 -18 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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