378  
CDUS41 KLWX 190524  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1224 AM EST TUE JAN 19 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 18 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 45 2:26 PM 70 1990 42 3 40  
MINIMUM 29 5:24 AM -1 1994 24 5 24  
AVERAGE 37 33 4 32  
 
PRECIPITATION (IN)  
YESTERDAY T 1.18 1980 0.08 -0.08 0.28  
MONTH TO DATE 1.25 1.50 -0.25 1.75  
SINCE DEC 1 7.06 4.46 2.60 4.72  
SINCE JAN 1 1.25 1.50 -0.25 1.75  
 
SNOWFALL (IN)  
YESTERDAY T 4.2 1984 0.2 -0.2 0.3  
MONTH TO DATE T 3.7 -3.7 2.3  
SINCE DEC 1 2.4 7.2 -4.8 2.9  
SINCE JUL 1 2.4 7.7 -5.3 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 28 32 -4 33  
MONTH TO DATE 492 576 -84 417  
SINCE DEC 1 1294 1458 -164 1217  
SINCE JUL 1 1961 2374 -413 2080  
 
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 25 HIGHEST WIND DIRECTION W (290)  
HIGHEST GUST SPEED 34 HIGHEST GUST DIRECTION W (290)  
AVERAGE WIND SPEED 7.7  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT SNOW  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 82 6:00 AM  
LOWEST 39 3:00 PM  
AVERAGE 61  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 42 65 1972  
MINIMUM TEMPERATURE (F) 24 -6 1994  
 
SUNRISE AND SUNSET  
JANUARY 19 2021.......SUNRISE 7:25 AM EST SUNSET 5:17 PM EST  
JANUARY 20 2021.......SUNRISE 7:25 AM EST SUNSET 5:18 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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