837
CXUS51 KOKX 011741
CLMISP

CLIMATE REPORT
NATIONAL WEATHER SERVICE NEW YORK, NY
1235 PM EST THU JAN 01 2026

...................................

...THE ISLIP NY CLIMATE SUMMARY FOR THE MONTH OF DECEMBER 2025...

CLIMATE NORMAL PERIOD 1991 TO 2020
CLIMATE RECORD PERIOD 1963 TO 2025

WEATHER         OBSERVED          NORMAL  DEPART   LAST YEAR`S
                VALUE   DATE(S)   VALUE   FROM     VALUE DATE(S)
                                          NORMAL
................................................................
TEMPERATURE (F)
RECORD
 HIGH             77   12/07/1998
 LOW                   12/31/1963
HIGHEST           59   12/19         MM      MM       61  12/30
LOWEST            16   12/28         MM      MM       10  12/23
AVG. MAXIMUM    42.1               44.4    -2.3     44.4
AVG. MINIMUM    26.5               29.8    -3.3     28.7
MEAN            34.3               37.1    -2.8     36.5
DAYS MAX >= 90     0                0.0     0.0        0
DAYS MAX <= 32     3                2.9     0.1        2
DAYS MIN <= 32    27               20.9     6.1       21
DAYS MIN <= 0      0                0.0     0.0        0

PRECIPITATION (INCHES)
RECORD
 MAXIMUM        8.91   1996
 MINIMUM        0.90   1985
TOTALS          3.77               4.71   -0.94     6.23
DAILY AVG.      0.12               0.15   -0.03     0.20
DAYS >= .01       10               11.8    -1.8       16
DAYS >= .10        7                7.8    -0.8       13
DAYS >= .50        3                3.3    -0.3        4
DAYS >= 1.00       1                1.4    -0.4        2
GREATEST
 24 HR. TOTAL   1.33   12/02 TO 12/02               1.68  12/16 TO 12/17
 STORM TOTAL    1.33                                1.56
 (MM/DD(HH))            MM

SNOWFALL (INCHES)
RECORDS
 TOTAL          25.3   2009
 24 HR TOTAL      MM
TOTALS          12.5                4.5     8.0      2.1
 LIQUID EQUIV   1.30               0.40    0.90     0.20
SINCE 7/1       12.5                5.0     7.5       MM
 LIQUID 7/1     1.25               0.50    0.75       MM
DAYS >= TRACE      7                2.6     4.4        6
DAYS >= 1.0        3                1.5     1.5        1
GREATEST
 SNOW DEPTH        6   12/15                           2  12/21
 24 HR TOTAL      MM                                  MM
 STORM TOTAL     5.8                                 2.0
 (MM/DD(HH))            MM

DEGREE DAYS
HEATING TOTAL    944                865      79      873
 SINCE 7/1      1733               1803     -70       MM
COOLING TOTAL      0                  0       0        0
 SINCE 1/1      1104                885     219       MM
................................................................

WIND (MPH)
AVERAGE WIND SPEED              10.3
HIGHEST WIND SPEED/DIRECTION    38/170    DATE  12/19
HIGHEST GUST SPEED/DIRECTION    59/170    DATE  12/19

SKY COVER
POSSIBLE SUNSHINE (PERCENT)   MM
AVERAGE SKY COVER           0.59
NUMBER OF DAYS FAIR            4
NUMBER OF DAYS PC             19
NUMBER OF DAYS CLOUDY          8

AVERAGE RH (PERCENT)     62

WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM              0     MIXED PRECIP               0
HEAVY RAIN                1     RAIN                       2
LIGHT RAIN                8     FREEZING RAIN              0
LT FREEZING RAIN          0     HAIL                       0
HEAVY SNOW                1     SNOW                       2
LIGHT SNOW                7     SLEET                      0
FOG                      10     FOG W/VIS <= 1/4 MILE      4
HAZE                      1

-  INDICATES NEGATIVE NUMBERS.
R  INDICATES RECORD WAS SET OR TIED.
MM INDICATES DATA IS MISSING.
T  INDICATES TRACE AMOUNT.

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