649  
CDUS41 KLWX 110522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST MON JAN 11 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 10 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 48 3:39 PM 59 2016 42 6 56  
MINIMUM 25 11:59 PM 0 1982 24 1 34  
AVERAGE 37 33 4 45  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.00 2016 0.08 -0.08 0.00  
MONTH TO DATE 1.14 0.81 0.33 1.00  
SINCE DEC 1 6.95 3.77 3.18 3.97  
SINCE JAN 1 1.14 0.81 0.33 1.00  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.2 1965 0.2 -0.2 0.0  
MONTH TO DATE 0.0 1.8 -1.8 2.0  
SINCE DEC 1 2.4 5.3 -2.9 2.6  
SINCE JUL 1 2.4 5.8 -3.4 2.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 32 -4 20  
MONTH TO DATE 269 320 -51 256  
SINCE DEC 1 1071 1202 -131 1056  
SINCE JUL 1 1738 2118 -380 1919  
 
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 18 HIGHEST WIND DIRECTION NW (330)  
HIGHEST GUST SPEED 26 HIGHEST GUST DIRECTION N (350)  
AVERAGE WIND SPEED 7.1  
 
SKY COVER  
AVERAGE SKY COVER 0.1  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 78 10:00 PM  
LOWEST 35 2:00 PM  
AVERAGE 57  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 71 1975  
MINIMUM TEMPERATURE (F) 24 -5 1988  
 
SUNRISE AND SUNSET  
JANUARY 11 2021.......SUNRISE 7:28 AM EST SUNSET 5:08 PM EST  
JANUARY 12 2021.......SUNRISE 7:28 AM EST SUNSET 5:09 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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