082  
CDUS41 KLWX 170525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST THU DEC 17 2020  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR DECEMBER 16 2020
 
 
CLIMATE NORMAL PERIOD: 1981 TO 2010  
CLIMATE RECORD PERIOD: 1960 TO 2020  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 34 6:10 PM 72 1971 46 -12 37  
MINIMUM 27 12:04 AM 9 2016 27 0 32  
AVERAGE 31 36 -5 35  
 
PRECIPITATION (IN)  
YESTERDAY 1.30R 0.99 1974 0.10 1.20 0.46  
MONTH TO DATE 3.53 1.68 1.85 2.27  
SINCE DEC 1 3.53 1.68 1.85 2.27  
SINCE JAN 1 47.18 40.26 6.92 40.11  
 
SNOWFALL (IN)  
YESTERDAY 2.3 5.2 1973 0.1 2.2 0.4  
MONTH TO DATE 2.3 1.6 0.7 0.6  
SINCE DEC 1 2.3 1.6 0.7 0.6  
SINCE JUL 1 2.3 2.1 0.2 0.6  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 34 29 5 30  
MONTH TO DATE 387 426 -39 415  
SINCE DEC 1 387 426 -39 415  
SINCE JUL 1 1054 1342 -288 1278  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1406 1178 228 1524    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION N (10)  
AVERAGE WIND SPEED 10.4  
 
SKY COVER  
AVERAGE SKY COVER 0.9  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FREEZING RAIN  
LT FREEZING RAIN  
HAIL  
SNOW  
LIGHT SNOW  
SLEET  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 96 7:00 PM  
LOWEST 63 9:00 AM  
AVERAGE 80  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 45 70 1984  
MINIMUM TEMPERATURE (F) 27 3 1989  
 
SUNRISE AND SUNSET  
DECEMBER 17 2020......SUNRISE 7:23 AM EST SUNSET 4:49 PM EST  
DECEMBER 18 2020......SUNRISE 7:24 AM EST SUNSET 4:50 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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