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Stony Brook, NY weather and climate

Suffolk County, NY · population 12,827 · about 174 ft elevation

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

The year at a glance

Sunny days
203
clear or partly cloudy, per year
Precipitation
44 in
per year
Wet days
122
rain or snow per year
Snowfall
33 in
per year
Hot days
14
above 90 °F
Freezing nights
90
at or below 32 °F
Humidity
73%
average relative
Average temperature
54 °F
year round

Monthly temperatures

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

Daily highDaily low
406080JanMarMayJulSepNovDaily high, Jan: 40 °FDaily high, Feb: 42 °FDaily high, Mar: 49 °FDaily high, Apr: 60 °FDaily high, May: 70 °FDaily high, Jun: 78 °FDaily high, Jul: 83 °FDaily high, Aug: 82 °FDaily high, Sep: 75 °FDaily high, Oct: 64 °FDaily high, Nov: 54 °FDaily high, Dec: 45 °FDaily low, Jan: 26 °FDaily low, Feb: 26 °FDaily low, Mar: 32 °FDaily low, Apr: 41 °FDaily low, May: 50 °FDaily low, Jun: 60 °FDaily low, Jul: 67 °FDaily low, Aug: 66 °FDaily low, Sep: 60 °FDaily low, Oct: 48 °FDaily low, Nov: 39 °FDaily low, Dec: 31 °F
View monthly temperatures as a table
Monthly temperatures (°F)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Daily high404249607078838275645445
Daily low262632415060676660483931

Monthly precipitation

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

0.02.04.0JanMarMayJulSepNovStony Brook, Jan: 3.4 inStony Brook, Feb: 3.1 inStony Brook, Mar: 4.2 inStony Brook, Apr: 3.6 inStony Brook, May: 3.3 inStony Brook, Jun: 3.6 inStony Brook, Jul: 3.4 inStony Brook, Aug: 4.0 inStony Brook, Sep: 3.6 inStony Brook, Oct: 4.0 inStony Brook, Nov: 3.3 inStony Brook, Dec: 4.2 in
View monthly precipitation as a table
Monthly precipitation (inches)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Stony Brook3.43.14.23.63.33.63.44.03.64.03.34.2

Monthly sunny days

Days each month with clear or partly cloudy skies.

01020JanMarMayJulSepNovStony Brook, Jan: 17 daysStony Brook, Feb: 16 daysStony Brook, Mar: 17 daysStony Brook, Apr: 16 daysStony Brook, May: 15 daysStony Brook, Jun: 15 daysStony Brook, Jul: 19 daysStony Brook, Aug: 19 daysStony Brook, Sep: 18 daysStony Brook, Oct: 19 daysStony Brook, Nov: 17 daysStony Brook, Dec: 17 days
View monthly sunny days as a table
Monthly sunny days (days)
CityJanFebMarAprMayJunJulAugSepOctNovDec
Stony Brook171617161515191918191717

Compare Stony Brook with another city

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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).