629  
CDUS41 KLWX 160527  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1227 AM EST SAT JAN 16 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 15 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 52 1:01 PM 68 2007 42 10 57  
MINIMUM 27 6:30 AM -7 1964 24 3 40  
AVERAGE 40 33 7 49  
 
PRECIPITATION (IN)  
YESTERDAY 0.11 1.56 1995 0.09 0.02 T  
MONTH TO DATE 1.25 1.25 -0.00 1.47  
SINCE DEC 1 7.06 4.21 2.85 4.44  
SINCE JAN 1 1.25 1.25 -0.00 1.47  
 
SNOWFALL (IN)  
YESTERDAY 0.0 1.4 1968 0.3 -0.3 0.0  
MONTH TO DATE 0.0 3.0 -3.0 2.0  
SINCE DEC 1 2.4 6.5 -4.1 2.6  
SINCE JUL 1 2.4 7.0 -4.6 2.6  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
YESTERDAY 25 32 -7 16  
MONTH TO DATE 410 480 -70 329  
SINCE DEC 1 1212 1362 -150 1129  
SINCE JUL 1 1879 2278 -399 1992  
 
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 16 HIGHEST WIND DIRECTION SE (140)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION E (110)  
AVERAGE WIND SPEED 6.4  
 
SKY COVER  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 97 11:00 PM  
LOWEST 58 2:00 PM  
AVERAGE 78  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 65 1974  
MINIMUM TEMPERATURE (F) 24 -4 1964  
 
SUNRISE AND SUNSET  
JANUARY 16 2021.......SUNRISE 7:26 AM EST SUNSET 5:13 PM EST  
JANUARY 17 2021.......SUNRISE 7:26 AM EST SUNSET 5:14 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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