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Central Islip, NY weather and climate

Suffolk County, NY · population 37,751 · about 69 ft elevation

Everything below is a 30 year average for 1991-2020, computed from daily climate history at Central Islip's own coordinates.

The year at a glance

Sunny days
205
clear or partly cloudy, per year
Precipitation
47 in
per year
Wet days
121
rain or snow per year
Snowfall
31 in
per year
Hot days
8
above 90 °F
Freezing nights
90
at or below 32 °F
Humidity
74%
average relative
Average temperature
53 °F
year round

Monthly temperatures

Average daily high and low for each month, in °F.

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 39 °FDaily high, Feb: 40 °FDaily high, Mar: 47 °FDaily high, Apr: 58 °FDaily high, May: 67 °FDaily high, Jun: 76 °FDaily high, Jul: 82 °FDaily high, Aug: 81 °FDaily high, Sep: 74 °FDaily high, Oct: 64 °FDaily high, Nov: 53 °FDaily high, Dec: 44 °FDaily low, Jan: 25 °FDaily low, Feb: 26 °FDaily low, Mar: 32 °FDaily low, Apr: 42 °FDaily low, May: 51 °FDaily low, Jun: 61 °FDaily low, Jul: 68 °FDaily low, Aug: 67 °FDaily low, Sep: 60 °FDaily low, Oct: 48 °FDaily low, Nov: 38 °FDaily low, Dec: 30 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high394047586776828174645344
Daily low252632425161686760483830

Monthly precipitation

Total rain plus melted snow for each month, in inches.

0.02.04.0JanMarMayJulSepNovCentral Islip, Jan: 3.8 inCentral Islip, Feb: 3.5 inCentral Islip, Mar: 4.6 inCentral Islip, Apr: 3.8 inCentral Islip, May: 3.5 inCentral Islip, Jun: 3.6 inCentral Islip, Jul: 3.3 inCentral Islip, Aug: 3.9 inCentral Islip, Sep: 3.8 inCentral Islip, Oct: 4.4 inCentral Islip, Nov: 3.7 inCentral Islip, Dec: 4.8 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Central Islip3.83.54.63.83.53.63.33.93.84.43.74.8

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovCentral Islip, Jan: 17 daysCentral Islip, Feb: 16 daysCentral Islip, Mar: 17 daysCentral Islip, Apr: 16 daysCentral Islip, May: 15 daysCentral Islip, Jun: 16 daysCentral Islip, Jul: 19 daysCentral Islip, Aug: 19 daysCentral Islip, Sep: 18 daysCentral Islip, Oct: 19 daysCentral Islip, Nov: 17 daysCentral Islip, Dec: 17 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Central Islip171617161516191918191717

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About this data

Figures are 30 year averages for 1991-2020. Wet days count days with measurable precipitation, calibrated against the wet day counts in NOAA's published climate normals. Sunny days count clear plus partly cloudy days, defined as average cloud cover of 63 percent or less and calibrated against NOAA's published sky cover tables. Snowfall figures are model estimates anchored to NOAA station measurements near each city.

Weather data by Open-Meteo.com (CC BY 4.0). Contains modified Copernicus Climate Change Service information (ERA5, ERA5-Land).