685
CXUS51 KPHI 030321
CLMABE

CLIMATE REPORT
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                                  -1
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.

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