040  
CDUS41 KLWX 290525  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1225 AM EST MON JAN 29 2024  
   
...............................  
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR JANUARY 28 2024  
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
CLIMATE RECORD PERIOD: 1960 TO 2024  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................  
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 47 12:57 AM 68 2002 43 4 56  
MINIMUM 42 11:59 PM -17 1987 25 17 31  
AVERAGE 45 34 11 44  
 
PRECIPITATION (IN)  
YESTERDAY 1.32 1.64 1998 0.10 1.22 0.00  
MONTH TO DATE 6.00 2.66 3.34 1.24  
SINCE DEC 1 11.75 5.96 5.79 6.19  
SINCE JAN 1 6.00 2.66 3.34 1.24  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.7 1994 0.2 -0.2 0.0  
MONTH TO DATE 9.5 6.0 3.5 T  
SINCE DEC 1 10.0 8.8 1.2 T  
SINCE JUL 1 10.0 9.1 0.9 T  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 20 31 -11 21  
MONTH TO DATE 791 864 -73 642  
SINCE DEC 1 1466 1709 -243 1504  
SINCE JUL 1 2237 2609 -372 2338  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 3 0 3 0  
SINCE DEC 1 3 0 3 0  
SINCE JAN 1 3 0 3 0    
...............................................................  
 
WIND (MPH)  
HIGHEST WIND SPEED 16 HIGHEST WIND DIRECTION NE (60)  
HIGHEST GUST SPEED 23 HIGHEST GUST DIRECTION NE (50)  
AVERAGE WIND SPEED 8.1  
 
SKY COVER  
AVERAGE SKY COVER 1.0  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 92 11:00 PM  
LOWEST 82 6:00 PM  
AVERAGE 87  
   
......................................................  
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 43 75 1975  
MINIMUM TEMPERATURE (F) 25 -1 1963  
1987  
 
SUNRISE AND SUNSET  
JANUARY 29 2024.......SUNRISE 7:19 AM EST SUNSET 5:27 PM EST  
JANUARY 30 2024.......SUNRISE 7:18 AM EST SUNSET 5:28 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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