541  
CDUS41 KLWX 290526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1226 AM EST FRI JAN 29 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 28 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 35 4:01 PM 68 2002 43 -8 45  
MINIMUM 26 11:59 PM -17 1987 24 2 38  
AVERAGE 31 34 -3 42  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.64 1998 0.10 -0.10 0.00  
MONTH TO DATE 1.57 2.40 -0.83 3.33  
SINCE DEC 1 7.38 5.36 2.02 6.30  
SINCE JAN 1 1.57 2.40 -0.83 3.33  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.7 1994 0.3 -0.3 0.0  
MONTH TO DATE 0.2 6.4 -6.2 2.3  
SINCE DEC 1 2.6 9.9 -7.3 2.9  
SINCE JUL 1 2.6 10.4 -7.8 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 34 31 3 23  
MONTH TO DATE 795 894 -99 712  
SINCE DEC 1 1597 1776 -179 1512  
SINCE JUL 1 2264 2692 -428 2375  
 
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 31 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 43 HIGHEST GUST DIRECTION NW (320)  
AVERAGE WIND SPEED 18.9  
 
SKY COVER  
AVERAGE SKY COVER 0.6  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 63 12:00 AM  
LOWEST 35 3:00 PM  
AVERAGE 49  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 75 1975  
MINIMUM TEMPERATURE (F) 24 -1 1963  
1987  
 
SUNRISE AND SUNSET  
JANUARY 29 2021.......SUNRISE 7:18 AM EST SUNSET 5:28 PM EST  
JANUARY 30 2021.......SUNRISE 7:18 AM EST SUNSET 5:29 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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