106  
CDUS41 KBOX 190603  
CLIBOS  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
203 AM EDT SUN SEP 19 2021  
   
...............................
 
 
   
..THE BOSTON MA CLIMATE SUMMARY FOR SEPTEMBER 18 2021
 
 
CLIMATE NORMAL PERIOD 1991 TO 2020  
CLIMATE RECORD PERIOD 1872 TO 2021  
 
WEATHER ITEM OBSERVED TIME RECORD YEAR NORMAL DEPARTURE LAST  
VALUE (LST) VALUE VALUE FROM YEAR  
NORMAL    
...............................................................
 
 
TEMPERATURE (F)  
YESTERDAY  
MAXIMUM 74 1146 AM 90 1891 72 2 66  
1906  
1955  
MINIMUM 66 758 AM 43 1875 58 8 51  
AVERAGE 70 65 5 59  
 
PRECIPITATION (IN)  
YESTERDAY 0.06 2.87 2004 0.13 -0.07 0.00  
MONTH TO DATE 5.86 2.03 3.83 0.46  
SINCE SEP 1 5.86 2.03 3.83 0.46  
SINCE JAN 1 41.82 30.07 11.75 22.18  
 
SNOWFALL (IN)  
YESTERDAY 0.0 0.0 2000 0.0 0.0 0.0  
2001  
2002  
MONTH TO DATE 0.0 0.0 0.0 0.0  
SINCE SEP 1 0.0 0.0 0.0 0.0  
SINCE JUL 1 0.0 0.0 0.0 T  
 
DEGREE DAYS  
HEATING  
YESTERDAY 0 2 -2 6  
MONTH TO DATE 0 22 -22 24  
SINCE SEP 1 0 22 -22 24  
SINCE JUL 1 9 31 -22 26  
 
COOLING  
YESTERDAY 5 2 3 0  
MONTH TO DATE 115 72 43 65  
SINCE SEP 1 115 72 43 65  
SINCE JAN 1 1091 772 319 892    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 3 RESULTANT WIND DIRECTION NE (30)  
HIGHEST WIND SPEED 18 HIGHEST WIND DIRECTION NE (30)  
HIGHEST GUST SPEED 25 HIGHEST GUST DIRECTION NE (30)  
AVERAGE WIND SPEED 5.4  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.8  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
THUNDERSTORM  
RAIN  
LIGHT RAIN  
FOG  
HAZE  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 90 1200 AM  
LOWEST 76 1100 AM  
AVERAGE 83  
   
......................................................
 
 
THE BOSTON MA CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 72 92 1983  
MINIMUM TEMPERATURE (F) 57 42 1929  
 
SUNRISE AND SUNSET  
SEPTEMBER 19 2021.....SUNRISE 629 AM EDT SUNSET 646 PM EDT  
SEPTEMBER 20 2021.....SUNRISE 630 AM EDT SUNSET 644 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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