434  
CDUS41 KBOX 200533  
CLIBOS  
 
CLIMATE REPORT  
NATIONAL WEATHER SERVICE BOSTON/NORTON MA  
1233 AM EST MON DEC 20 2021  
   
...............................
 
 
   
..THE BOSTON MA CLIMATE SUMMARY FOR DECEMBER 19 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 44 230 AM 64 1899 41 3 31  
MINIMUM 23 1159 PM -10 1875 28 -5 17  
AVERAGE 34 35 -1 24  
 
PRECIPITATION (IN)  
YESTERDAY 0.38 1.35 1986 0.15 0.23 0.00  
MONTH TO DATE 1.70 2.73 -1.03 3.05  
SINCE DEC 1 1.70 2.73 -1.03 3.05  
SINCE JAN 1 51.58 42.02 9.56 34.92  
 
SNOWFALL (IN)  
YESTERDAY 0.0 10.0 1945 0.3 -0.3 0.0  
MONTH TO DATE 0.4 4.6 -4.2 13.0  
SINCE DEC 1 0.4 4.6 -4.2 13.0  
SINCE JUL 1 0.4 5.5 -5.1 17.3  
 
DEGREE DAYS  
HEATING  
YESTERDAY 31 30 1 41  
MONTH TO DATE 434 528 -94 551  
SINCE DEC 1 434 528 -94 551  
SINCE JUL 1 1222 1542 -320 1438  
 
COOLING  
YESTERDAY 0 0 0 0  
MONTH TO DATE 0 0 0 0  
SINCE DEC 1 0 0 0 0  
SINCE JAN 1 1146 800 346 924    
...............................................................
 
 
WIND (MPH)  
RESULTANT WIND SPEED 14 RESULTANT WIND DIRECTION NW (330)  
HIGHEST WIND SPEED 24 HIGHEST WIND DIRECTION NW (320)  
HIGHEST GUST SPEED 33 HIGHEST GUST DIRECTION NW (330)  
AVERAGE WIND SPEED 14.7  
 
SKY COVER  
POSSIBLE SUNSHINE MM  
AVERAGE SKY COVER 0.7  
 
WEATHER CONDITIONS  
THE FOLLOWING WEATHER WAS RECORDED YESTERDAY.  
HEAVY RAIN  
RAIN  
LIGHT RAIN  
LT FREEZING RAIN  
LIGHT SNOW  
SLEET  
FOG  
 
RELATIVE HUMIDITY (PERCENT)  
HIGHEST 100 100 AM  
LOWEST 58 800 PM  
AVERAGE 79  
   
......................................................
 
 
THE BOSTON MA CLIMATE NORMALS FOR TODAY  
NORMAL RECORD YEAR  
MAXIMUM TEMPERATURE (F) 41 63 1957  
MINIMUM TEMPERATURE (F) 28 -11 1875  
1942  
 
SUNRISE AND SUNSET  
DECEMBER 20 2021......SUNRISE 710 AM EST SUNSET 414 PM EST  
DECEMBER 21 2021......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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