515  
CDUS41 KBOX 200634  
CLIBOS  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
124 AM EST THU DEC 20 2018  
 
   
...............................
 
 
   
..THE BOSTON MA CLIMATE SUMMARY FOR DECEMBER 19 2018
 
 
CLIMATE NORMAL PERIOD 1981 TO 2010  
CLIMATE RECORD PERIOD 1872 TO 2018  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
..............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 42 341 PM 64 1899 40 2 51  
MINIMUM 24 319 AM -10 1875 27 -3 34  
AVERAGE 33 34 -1 43  
 
PRECIPITATION (IN)  
YESTERDAY 0.00 1.35 1986 0.12 -0.12 0.00  
MONTH TO DATE 1.35 2.41 -1.06 1.36  
SINCE DEC 1 1.35 2.41 -1.06 1.36  
SINCE JAN 1 51.95 42.40 9.55 42.32  
 
SNOWFALL (IN)  
YESTERDAY 0.0 10.0 1945 0.3 -0.3 0.0  
MONTH TO DATE 0.1 4.7 -4.6 6.1  
SINCE DEC 1 0.1 4.7 -4.6 6.1  
SINCE JUL 1 0.2 6.0 -5.8 6.1  
SNOW DEPTH MM  
 
DEGREE DAYS  
HEATING  
YESTERDAY 32 31 1 22  
MONTH TO DATE 548 538 10 555  
SINCE DEC 1 548 538 10 555  
SINCE JUL 1 1572 1593 -21 1382  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1132 747 385 880    
..............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 8 RESULTANT WIND DIRECTION W (260)  
HIGHEST WIND SPEED 20 HIGHEST WIND DIRECTION NW (300)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION NW (310)  
AVERAGE WIND SPEED 9.8  
 
 
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 55 200 AM  
LOWEST 22 300 PM  
AVERAGE 39  
   
......................................................
 
 
 
THE BOSTON MA CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 40 63 1957  
MINIMUM TEMPERATURE (F) 27 -11 1942  
1875  
 
 
SUNRISE AND SUNSET  
DECEMBER 20 2018......SUNRISE 709 AM EST SUNSET 414 PM EST  
DECEMBER 21 2018......SUNRISE 710 AM EST SUNSET 415 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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