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
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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
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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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