665  
CDUS41 KLWX 120540  
CLIDCA  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC  
1240 AM EST TUE DEC 12 2017  
 
   
...............................
 
 
   
..THE WASHINGTON NATIONAL DC CLIMATE SUMMARY FOR DECEMBER 11 2017
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1871 TO 2017  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 49 130 PM 68 1979 48 1 43  
1971  
1897  
MINIMUM 35 756 AM 12 1917 34 1 29  
1904  
1880  
AVERAGE 42 41 1 36  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.66 2008 0.11 -0.11 0.00  
MONTH TO DATE 0.28 1.19 -0.91 1.40  
SINCE DEC 1 0.28 1.19 -0.91 1.40  
SINCE JAN 1 35.38 37.88 -2.50 30.49  
 
SNOWFALL (IN)  
YESTERDAY 0.0 6.8 1960 0.1 -0.1  
MONTH TO DATE 2.0 0.7 1.3  
SINCE JUL 1 2.0 1.2 0.8  
SNOW DEPTH 0  
 
DEGREE DAYS  
HEATING  
YESTERDAY 23 24 -1 29  
MONTH TO DATE 224 249 -25 236  
SINCE DEC 1 224 249 -25 236  
SINCE JUL 1 773 944 -171 723  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1826 1549 277 1994    
..............................................................
 
 
WIND (MPH)  
HIGHEST WIND SPEED 17 HIGHEST WIND DIRECTION S (180)  
HIGHEST GUST SPEED 20 HIGHEST GUST DIRECTION S (170)  
AVERAGE WIND SPEED 7.2  
 
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.6  
 
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
NO SIGNIFICANT WEATHER WAS OBSERVED.  
 
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 75 400 AM  
LOWEST 39 100 PM  
AVERAGE 57  
   
......................................................
 
 
 
THE WASHINGTON NATIONAL DC CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 48 71 1873  
MINIMUM TEMPERATURE (F) 33 13 1988  
1957  
 
 
SUNRISE AND SUNSET  
DECEMBER 12 2017......SUNRISE 717 AM EST SUNSET 447 PM EST  
DECEMBER 13 2017......SUNRISE 718 AM EST SUNSET 447 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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