337
CXUS51 KPHI 012055
CLMABE
CLIMATE REPORT
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
455 PM EDT WED OCT 01 2025
...............................
...THE ALLENTOWN PA CLIMATE SUMMARY FOR THE MONTH OF SEPTEMBER 2025...
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1922 TO 2025
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
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TEMPERATURE (F)
RECORD
HIGH 99 09/02/1980
09/03/1953
09/02/1953
LOW 30 09/28/1947
HIGHEST 86 09/18 89 -3 85 09/01
09/28
LOWEST 47 09/08 40 7 44 09/09
09/09
AVG. MAXIMUM 79.1 77.4 1.7 75.7
AVG. MINIMUM 56.0 55.2 0.8 54.7
MEAN 67.6 66.3 1.3 65.2
DAYS MAX >= 90 0 2.0 -2.0 0
DAYS MAX <= 32 0 0.0 0.0 0
DAYS MIN <= 32 0 0.0 0.0 0
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 12.99 2011
MINIMUM 0.12 1943
TOTALS 2.66 4.84 -2.18 1.30
DAILY AVG. 0.09 0.16 -0.07 0.04
DAYS >= .01 9 9.6 -0.6 8
DAYS >= .10 4 6.5 -2.5 5
DAYS >= .50 1 2.9 -1.9 0
DAYS >= 1.00 1 1.5 -0.5 0
GREATEST
24 HR. TOTAL 1.88 09/04 TO 09/04 0.42
SNOWFALL (INCHES)
RECORDS
TOTAL 0.0 MM
SNOW DEPTH 0 MM
TOTALS 0.0 0.0 0.0 0.0
SINCE 7/1 0.0 0.0 0.0 0.0
SNOWDEPTH AVG. 0 0
DAYS >= TRACE 0 0
DAYS >= 1.0 0 0.0 0.0 0
GREATEST
SNOW DEPTH 0 0
24 HR TOTAL 0.0 0.0
DEGREE DAYS
HEATING TOTAL 14 70 -56 39
SINCE 7/1 26 74 -48 48
COOLING TOTAL 100 108 -8 55
SINCE 1/1 919 968 -49 991
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WIND (MPH)
AVERAGE WIND SPEED 4.9
HIGHEST WIND SPEED/DIRECTION 21/200 DATE 09/04
21/280 09/25
HIGHEST GUST SPEED/DIRECTION 34/260 DATE 09/25
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.33
NUMBER OF DAYS FAIR 20
NUMBER OF DAYS PC 6
NUMBER OF DAYS CLOUDY 4
AVERAGE RH (PERCENT) 69
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 3 MIXED PRECIP 0
HEAVY RAIN 3 RAIN 4
LIGHT RAIN 11 FREEZING RAIN 0
LT FREEZING RAIN 0 HEAVY SNOW 0
SNOW 0 LIGHT SNOW 0
SLEET 0 FOG 10
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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