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Mount Sinai, NY vs Port Jefferson, NY weather comparison

Mount Sinai

NY

Mount Sinai and Port Jefferson have remarkably similar climates.

The year at a glance

Averages from 30 years of climate history, 1991-2020

Annual weather statistics for Mount Sinai, NY and Port Jefferson, NY
Mount SinaiMetricPort Jefferson
205 daysSunny daysclear or partly cloudy skies205 days
47 inPrecipitationper year47 in
121 daysWet daysrain or snow per year121 days
32 inSnowfallper year31 in
9 daysHot daysabove 90 °F11 days
80 daysFreezing nightsat or below 32 °F85 days
73%Humidityaverage relative73%
55 °FAverage temperatureyear round54 °F

Monthly temperatures

Average daily high and low for each month, in °F. The gap between the two lines is what an ordinary day feels like across the year.

Mount SinaiPort Jefferson

Daily highs

406080JanMarMayJulSepNovMount Sinai, Jan: 41 °FMount Sinai, Feb: 43 °FMount Sinai, Mar: 50 °FMount Sinai, Apr: 64 °FMount Sinai, May: 72 °FMount Sinai, Jun: 78 °FMount Sinai, Jul: 83 °FMount Sinai, Aug: 82 °FMount Sinai, Sep: 75 °FMount Sinai, Oct: 65 °FMount Sinai, Nov: 56 °FMount Sinai, Dec: 46 °FPort Jefferson, Jan: 40 °FPort Jefferson, Feb: 42 °FPort Jefferson, Mar: 49 °FPort Jefferson, Apr: 62 °FPort Jefferson, May: 71 °FPort Jefferson, Jun: 78 °FPort Jefferson, Jul: 83 °FPort Jefferson, Aug: 82 °FPort Jefferson, Sep: 75 °FPort Jefferson, Oct: 64 °FPort Jefferson, Nov: 55 °FPort Jefferson, Dec: 46 °F

Daily lows

4060JanMarMayJulSepNovMount Sinai, Jan: 26 °FMount Sinai, Feb: 28 °FMount Sinai, Mar: 33 °FMount Sinai, Apr: 43 °FMount Sinai, May: 51 °FMount Sinai, Jun: 61 °FMount Sinai, Jul: 67 °FMount Sinai, Aug: 67 °FMount Sinai, Sep: 61 °FMount Sinai, Oct: 49 °FMount Sinai, Nov: 40 °FMount Sinai, Dec: 32 °FPort Jefferson, Jan: 26 °FPort Jefferson, Feb: 27 °FPort Jefferson, Mar: 33 °FPort Jefferson, Apr: 42 °FPort Jefferson, May: 51 °FPort Jefferson, Jun: 61 °FPort Jefferson, Jul: 67 °FPort Jefferson, Aug: 66 °FPort Jefferson, Sep: 61 °FPort Jefferson, Oct: 49 °FPort Jefferson, Nov: 40 °FPort Jefferson, Dec: 32 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Mount Sinai high414350647278838275655646
Port Jefferson high404249627178838275645546
Mount Sinai low262833435161676761494032
Port Jefferson low262733425161676661494032

Monthly precipitation

Total rain plus melted snow for each month, in inches. Taller bars mean wetter months.

Mount SinaiPort Jefferson
0.02.04.0JanMarMayJulSepNovMount Sinai, Jan: 3.7 inMount Sinai, Feb: 3.4 inMount Sinai, Mar: 4.6 inMount Sinai, Apr: 3.9 inMount Sinai, May: 3.4 inMount Sinai, Jun: 3.6 inMount Sinai, Jul: 3.2 inMount Sinai, Aug: 4.0 inMount Sinai, Sep: 3.8 inMount Sinai, Oct: 4.4 inMount Sinai, Nov: 3.7 inMount Sinai, Dec: 4.8 inPort Jefferson, Jan: 3.7 inPort Jefferson, Feb: 3.4 inPort Jefferson, Mar: 4.6 inPort Jefferson, Apr: 3.9 inPort Jefferson, May: 3.4 inPort Jefferson, Jun: 3.6 inPort Jefferson, Jul: 3.2 inPort Jefferson, Aug: 4.0 inPort Jefferson, Sep: 3.8 inPort Jefferson, Oct: 4.4 inPort Jefferson, Nov: 3.7 inPort Jefferson, Dec: 4.8 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Mount Sinai3.73.44.63.93.43.63.24.03.84.43.74.8
Port Jefferson3.73.44.63.93.43.63.24.03.84.43.74.8

Monthly sunny days

Days each month with clear or partly cloudy skies, so compare the same month between cities.

Mount SinaiPort Jefferson
01020JanMarMayJulSepNovMount Sinai, Jan: 17 daysMount Sinai, Feb: 16 daysMount Sinai, Mar: 17 daysMount Sinai, Apr: 16 daysMount Sinai, May: 15 daysMount Sinai, Jun: 16 daysMount Sinai, Jul: 19 daysMount Sinai, Aug: 19 daysMount Sinai, Sep: 18 daysMount Sinai, Oct: 19 daysMount Sinai, Nov: 17 daysMount Sinai, Dec: 16 daysPort Jefferson, Jan: 17 daysPort Jefferson, Feb: 16 daysPort Jefferson, Mar: 17 daysPort Jefferson, Apr: 16 daysPort Jefferson, May: 15 daysPort Jefferson, Jun: 16 daysPort Jefferson, Jul: 19 daysPort Jefferson, Aug: 19 daysPort Jefferson, Sep: 18 daysPort Jefferson, Oct: 19 daysPort Jefferson, Nov: 17 daysPort Jefferson, Dec: 16 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Mount Sinai171617161516191918191716
Port Jefferson171617161516191918191716

Keep comparing

Nearby cities and popular picks for each side of this matchup. Any two cities can be compared from the home page.

Mount Sinai vs another city

See the full Mount Sinai, NY climate profile

More New York cities

Port Jefferson vs another city

See the full Port Jefferson, NY climate profile

More New York cities

About this data

Every figure on this page is a 30 year average computed from daily climate history for 1991-2020, using each city's own coordinates. 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).