674
CXUS51 KOKX 020049 RRA
CLAISP
CLIMATE REPORT
NATIONAL WEATHER SERVICE NEW YORK, NY
726 PM EST THU JAN 01 2026
...............................
..THE ISLIP NY CLIMATE SUMMARY FOR THE YEAR OF 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 104 07/03/1966
LOW -14 02/13/1967
HIGHEST 101 06/24 MM MM 93 07/16
08/01
LOWEST 7 01/22 MM MM 10 12/23
AVG. MAXIMUM 62.7 61.1 1.6 63.2
AVG. MINIMUM 46.6 45.2 1.4 47.2
MEAN 54.7 53.1 1.6 55.2
DAYS MAX >= 90 12 8.3 3.7 6
DAYS MAX <= 32 13 16.4 -3.4 8
DAYS MIN <= 32 93 98.3 -5.3 69
DAYS MIN <= 0 0 0.1 -0.1 0
PRECIPITATION (INCHES)
RECORD
MAXIMUM 65.32 1989
MINIMUM MM MM
TOTALS 36.91 45.99 -9.08 48.80
DAILY AVG. 0.10 0.13 -0.03 0.13
DAYS >= .01 119 122.0 -3.0 126
DAYS >= .10 78 75.7 2.3 76
DAYS >= .50 21 30.6 -9.6 30
DAYS >= 1.00 10 11.5 -1.5 18
GREATEST
24 HR. TOTAL 2.96 2.81 08/06 TO 08/07
STORM TOTAL 2.93 2.80
(MM/DD(HH)) MM
SNOWFALL (INCHES)
RECORDS
TOTAL 71.0 1978
24 HR TOTAL 3.0 MM
SNOW DEPTH 26 02/09/1978
02/08/1978
TOTALS 22.1 31.8 -9.7 13.0
LIQUID EQUIV 2.20 3.10 -0.90 1.30
SINCE 7/1 12.5 5.0 7.5 MM
LIQUID 7/1 1.25 0.50 0.75 MM
SNOWDEPTH AVG. 0 0
DAYS >= TRACE 23 13.4 9.6 23
DAYS >= 1.0 6 7.9 -1.9 4
GREATEST
SNOW DEPTH 6 12/15 3 02/15
02/17
02/18
24 HR TOTAL 0.0 MM 0.0
STORM TOTAL 5.8 4.3
(MM/DD(HH)) MM
DEGREE DAYS
HEATING TOTAL 4756 5183 -427 4484
SINCE 7/1 1733 1803 -70 MM
COOLING TOTAL 1104 885 219 1012
SINCE 1/1 1104 885 219 MM
............................................................
WIND (MPH)
AVERAGE WIND SPEED 9.7
RESULTANT WIND SPEED/DIRECTION 3/280
HIGHEST WIND SPEED/DIRECTION 39/300 DATE 03/22
HIGHEST GUST SPEED/DIRECTION 60/290 DATE 03/22
SKY COVER
POSSIBLE SUNSHINE (PERCENT) MM
AVERAGE SKY COVER 0.58
NUMBER OF DAYS FAIR 74
NUMBER OF DAYS PC 188
NUMBER OF DAYS CLOUDY 101
AVERAGE RH (PERCENT) 66
WEATHER CONDITIONS. NUMBER OF DAYS WITH
THUNDERSTORM 15 MIXED PRECIP 0
HEAVY RAIN 26 RAIN 46
LIGHT RAIN 147 FREEZING RAIN 0
LT FREEZING RAIN 2 HAIL 0
HEAVY SNOW 2 SNOW 5
LIGHT SNOW 23 SLEET 2
FOG 140 FOG W/VIS <= 1/4 MILE 39
HAZE 34
- 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