514  
CDUS41 KLWX 220522  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1222 AM EST FRI JAN 22 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 21 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 54 4:21 PM 63 2018 43 11 35  
MINIMUM 19 3:21 AM -16 1984 24 -5 20  
AVERAGE 37 33 4 28  
 
PRECIPITATION (IN)  
YESTERDAY 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)  
YESTERDAY 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  
YESTERDAY 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  
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 15 HIGHEST WIND DIRECTION SW (240)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION W (250)  
AVERAGE WIND SPEED 5.9  
 
SKY COVER  
AVERAGE SKY COVER 0.3  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 81 2:00 AM  
LOWEST 31 7:00 PM  
AVERAGE 56  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 68 1986  
MINIMUM TEMPERATURE (F) 24 -18 1984  
 
SUNRISE AND SUNSET  
JANUARY 22 2021.......SUNRISE 7:23 AM EST SUNSET 5:20 PM EST  
JANUARY 23 2021.......SUNRISE 7:23 AM EST SUNSET 5:21 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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