324
CXUS51 KPHI 052232 CCA
CLMABE
CLIMATE REPORT...CORRECTED
NATIONAL WEATHER SERVICE MOUNT HOLLY NJ
1021 PM EST FRI JAN 02 2026
...............................
..THE ALLENTOWN PA CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2025
CLIMATE NORMAL PERIOD: 1991 TO 2020
CLIMATE RECORD PERIOD: 1922 TO 2026
WEATHER OBSERVED NORMAL DEPART LAST YEAR'S
VALUE DATE(S) VALUE FROM VALUE DATE(S)
NORMAL
............................................................
TEMPERATURE (F)
RECORD
HIGH 72 12/01/2006
12/04/1998
12/29/1984
LOW -9 12/31/1917
HIGHEST 59 12/19 62 -3 62 12/11
12/29
LOWEST 8 12/09 12 -4 1 12/23
AVG. MAXIMUM 37.2 43.1 -5.9 41.0
AVG. MINIMUM 20.8 26.8 -6.0 23.9
MEAN 29.0 35.0 -6.0 32.5
DAYS MAX >= 90 0 0.0 0.0 0
DAYS MAX <= 32 10 5.0 5.0 4
DAYS MIN <= 32 31 23.8 7.2 26
DAYS MIN <= 0 0 0.0 0.0 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 8.62 2023
MINIMUM 0.39 1955
TOTALS 2.54 3.86 -1.32 3.86
DAILY AVG. 0.08 0.12 -0.04 0.12
DAYS >= .01 10 11.5 -1.5 15
DAYS >= .10 7 7.3 -0.3 8
DAYS >= .50 2 2.8 -0.8 2
DAYS >= 1.00 0 1.0 -1.0 1
GREATEST
24 HR. TOTAL 0.67 12/18 TO 12/19 1.25
SNOWFALL (INCHES)
RECORDS
TOTAL 28.4 1966
SNOW DEPTH 17 12/25/1966
TOTALS 7.5 4.6 2.9 4.8
SINCE 7/1 7.7 5.7 2.0 4.8
SNOWDEPTH AVG. 1 T
DAYS >= TRACE 11 8
DAYS >= 1.0 2 1.0 1.0 1
GREATEST
SNOW DEPTH 5 12/14 4 12/21
12/15
24 HR TOTAL 5.0 12/13 TO 12/14 3.8
DEGREE DAYS
HEATING TOTAL 1109 931 178 1001
SINCE 7/1 2121 1967 154 1870
COOLING TOTAL 0 0 0 0
SINCE 1/1 924 981 -57 994
............................................................
WIND (MPH)
AVERAGE WIND SPEED 7.7
HIGHEST WIND SPEED/DIRECTION 37/250 DATE 12/19
HIGHEST GUST SPEED/DIRECTION 58/280 DATE 12/19
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.48
NUMBER OF DAYS FAIR 13
NUMBER OF DAYS PC 9
NUMBER OF DAYS CLOUDY 9
AVERAGE RH (PERCENT) 67
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 1 MIXED PRECIP 0
HEAVY RAIN 1 RAIN 2
LIGHT RAIN 7 FREEZING RAIN 1
LT FREEZING RAIN 3 HEAVY SNOW 0
SNOW 0 LIGHT SNOW 11
SLEET 1 FOG 14
FOG W/VIS <= 1/4 MILE 1 HAZE 0
- INDICATES NEGATIVE NUMBERS.
R INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T INDICATES TRACE AMOUNT.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page