Climatological Report (Monthly)
Issued by NWS Boston, MA
Issued by NWS Boston, MA
402
CXUS51 KBOX 011156
CLMBOS
CLIMATE REPORT
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
756 AM EDT WED OCT 01 2025
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...THE BOSTON MA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1872 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR`S
VALUE DATE(S) VALUE FROM VALUE
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 102 09/07/1881
LOW 34 09/29/1914
09/26/1879
HIGHEST 86 09/06 83
LOWEST 51 09/21 53
AVG. MAXIMUM 73.6 73.1 0.5
AVG. MINIMUM 59.3 58.2 1.1
MEAN 66.5 65.6 0.9
DAYS MAX >= 90 0 0.8 -0.8
DAYS MAX <= 32 0 0.0 0.0
DAYS MIN <= 32 0 0.0 0.0
DAYS MIN <= 0 0 0.0 0.0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 10.94 1933
MINIMUM 0.21 1914
TOTALS 3.09 3.56 -0.47
DAILY AVG. 0.10 0.12 -0.02
DAYS >= .01 8 9.0 -1.0
DAYS >= .10 5 6.0 -1.0
DAYS >= .50 3 2.1 0.9
DAYS >= 1.00 1 0.8 0.2
GREATEST
24 HR. TOTAL 1.45 09/24 TO 09/25
SNOWFALL (INCHES)
RECORDS
TOTAL 0.0 MM
TOTALS 0.0 0.0 0.0
LIQUID EQUIV 0.00
SINCE 7/1 0.0 0.0 0.0
DAYS >= TRACE 0 0.0 0.0
DAYS >= 1.0 0 0.0 0.0
GREATEST
24 HR TOTAL MM
DEGREE DAYS
HEATING TOTAL 32 71 -39
SINCE 7/1 39 80 -41
COOLING TOTAL 85 91 -6
SINCE 1/1 842 791 51
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WIND (MPH)
AVERAGE WIND SPEED 8.4
RESULTANT WIND SPEED/DIRECTION 1/110
HIGHEST WIND SPEED/DIRECTION 30/180 DATE 09/06
HIGHEST GUST SPEED/DIRECTION 39/190 DATE 09/06
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.53
NUMBER OF DAYS FAIR 8
NUMBER OF DAYS PC 17
NUMBER OF DAYS CLOUDY 5
AVERAGE RH (PERCENT) 73
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 2 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 4
LIGHT RAIN 8 FREEZING RAIN 0
LT FREEZING RAIN 0 HAIL 0
HEAVY SNOW 0 SNOW 0
LIGHT SNOW 0 SLEET 0
FOG 8 FOG W/VIS <= 1/4 MILE 2
HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
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