267  
CDUS41 KLWX 080526  
CLIIAD  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
126 AM EDT SAT MAY 08 2021  
   
...............................
 
 
   
..THE WASHINGTON DULLES DC CLIMATE SUMMARY FOR MAY 7 2021
 
 
CLIMATE NORMAL PERIOD: 1991 TO 2020  
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 62 12:00 PM 90 1986 73 -11 68  
2000  
MINIMUM 41 4:28 AM 28 1970 50 -9 39  
AVERAGE 52 62 -10 54  
 
PRECIPITATION (IN)  
YESTERDAY 0.19 1.51 1967 0.13 0.06 0.00  
MONTH TO DATE 0.98 0.99 -0.01 1.41  
SINCE MAR 1 5.53 7.96 -2.43 8.96  
SINCE JAN 1 11.69 13.51 -1.82 15.53  
 
SNOWFALL (IN)  
YESTERDAY 0.0 MM MM 0.0 0.0 0.0  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE MAR 1 T 4.0 -4.0 T  
SINCE JUL 1 12.0 21.0 -9.0 2.9  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 13 5 8 11  
MONTH TO DATE 30 39 -9 51  
SINCE MAR 1 845 1006 -161 881  
SINCE JUL 1 4038 4516 -478 4025  
 
COOLING  
YESTERDAY 0 2 -2 0  
MONTH TO DATE 17 10 7 4  
SINCE MAR 1 43 32 11 7  
SINCE JAN 1 43 32 11 7    
...............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 13 HIGHEST WIND DIRECTION SW (220)  
HIGHEST GUST SPEED 18 HIGHEST GUST DIRECTION SW (220)  
AVERAGE WIND SPEED 4.1  
 
SKY COVER  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
RAIN  
LIGHT RAIN  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 93 6:00 AM  
LOWEST 50 12:00 PM  
AVERAGE 72  
   
......................................................
 
 
THE WASHINGTON DULLES DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 73 90 2000  
MINIMUM TEMPERATURE (F) 51 29 1974  
 
SUNRISE AND SUNSET  
MAY 8 2021...........SUNRISE 6:04 AM EDT SUNSET 8:09 PM EDT  
MAY 9 2021...........SUNRISE 6:03 AM EDT SUNSET 8:10 PM EDT  
 
- INDICATES NEGATIVE NUMBERS.  
R INDICATES RECORD WAS SET OR TIED.  
MM INDICATES DATA IS MISSING.  
T INDICATES TRACE AMOUNT.  
 

 
 
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