Monthly weather forecast and climate
Stony Brook, NY

Weather in January

January, like December, in Stony Brook, New York, is another cold winter month, with temperature in the range of an average high of 37.6°F (3.1°C) and an average low of 29.1°F (-1.6°C). The coldest month is January, with an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 29.1°F (-1.6°C). Weather in January »

Weather in February

February, the last month of the winter, in Stony Brook, is another cold month, with average temperature fluctuating between 30.4°F (-0.9°C) and 38.8°F (3.8°C). In February, the average high-temperature is essentially the same as in January - a still cold 38.8°F (3.8°C). Weather in February »

Weather in March

March, the first month of the spring, in Stony Brook, is a frosty month, with temperature in the range of an average low of 36°F (2.2°C) and an average high of 43.9°F (6.6°C). In March, the average high-temperature is essentially the same as in February - a chilly 43.9°F (6.6°C). Weather in March »

Weather in April

April is a cool spring month in Stony Brook, New York, with average temperature fluctuating between 52.9°F (11.6°C) and 44.6°F (7°C). In April, the average high-temperature rises, from a frosty 43.9°F (6.6°C) in March, to a cool 52.9°F (11.6°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Stony Brook, New York, with average temperature varying between 62.6°F (17°C) and 53.6°F (12°C). In Stony Brook, the average high-temperature rises, from a cool 52.9°F (11.6°C) in April, to an enjoyable 62.6°F (17°C). Weather in May »

Weather in June

The first month of the summer, June, is a pleasant month in Stony Brook, New York, with average temperature fluctuating between 71.2°F (21.8°C) and 63.1°F (17.3°C). In June, the average high-temperature marginally rises, from a comfortable 62.6°F (17°C) in May, to an agreeable 71.2°F (21.8°C). Weather in June »

Weather in July

July in Stony Brook, New York, is a moderately hot summer month, with average temperature fluctuating between 71.1°F (21.7°C) and 79.2°F (26.2°C). The warmest month is July, with an average high-temperature of 79.2°F (26.2°C) and an average low-temperature of 71.1°F (21.7°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Stony Brook, New York, with average temperature varying between 71.1°F (21.7°C) and 78.4°F (25.8°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 78.4°F (25.8°C). Weather in August »

Weather in September

September, the first month of the autumn, in Stony Brook, is also an agreeable month, with average temperature ranging between max 72.3°F (22.4°C) and min 64.8°F (18.2°C). In Stony Brook, the average high-temperature marginally drops, from a warm 78.4°F (25.8°C) in August, to a pleasant 72.3°F (22.4°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Stony Brook, New York, with average temperature varying between 62.6°F (17°C) and 55.4°F (13°C). In October, the average high-temperature decreases, from a pleasant 72.3°F (22.4°C) in September, to an enjoyable 62.6°F (17°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Stony Brook, New York, with average temperature fluctuating between 44.1°F (6.7°C) and 51.8°F (11°C). In November, the average high-temperature drops, from a comfortable 62.6°F (17°C) in October, to a fresh 51.8°F (11°C). Weather in November »

Weather in December

December, the first month of the winter, in Stony Brook, is still a chilly month, with average temperature fluctuating between 43.7°F (6.5°C) and 36.5°F (2.5°C). In December, the average high-temperature slightly decreases, from a cool 51.8°F (11°C) in November, to a chilly 43.7°F (6.5°C). Weather in December »
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FAQ

What is the coldest month in Stony Brook?

The coldest month in Stony Brook is January, with an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 29.1°F (-1.6°C).

How many days does it rain in Stony Brook?

Throughout the year, there are 146.8 rainfall days, and 33.78" (858mm) of precipitation is accumulated.

What is the driest month in Stony Brook?

January is the month with the least rainfall in Stony Brook. Rain falls for 6.8 days and accumulates 2.05" (52mm) of precipitation.

When does it snow in Stony Brook?

Months with snowfall are January through March, October through December.

How much does it snow in Stony Brook?

Throughout the year, in Stony Brook, New York, there are 12.6 snowfall days, and 5.59" (142mm) of snow is accumulated.

When is the lowest UV index in Stony Brook?

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index.

What month is the ocean coldest in Stony Brook?

With an average ocean temperature of 39.7°F (4.3°C), February is the month with the coldest seawater in Stony Brook, New York.

What is the month with the least sunshine in Stony Brook?

February has the least sunshine of the year in Stony Brook, New York, with an average of 4.7h of sunshine.

When does it snow the most in Stony Brook?

The month with the most snowfall is March when snow falls for 2.3 days and typically aggregates up to 2.13" (54mm) of snow.

When it does not snow in Stony Brook?

In Stony Brook, New York, snow does not fall in April through September.

What are the most humid months in Stony Brook?

May and June, with an average relative humidity of 77%, are most humid months in Stony Brook.

When are the longest days in Stony Brook?

With an average of 15.1h of daylight, June has the longest days of the year.

When is the highest UV index in Stony Brook?

Months with the highest UV index in Stony Brook, New York, are June through August, with an average maximum UV index of 6.

What is the warmest month in Stony Brook?

The warmest month in Stony Brook, New York, is July, with an average high-temperature of 79.2°F (26.2°C) and an average low-temperature of 71.1°F (21.7°C).

What month has the most sunshine in Stony Brook?

July has the most sunshine of the year in Stony Brook, New York, with an average of 10.6h of sunshine.

What is the month with the warmest ocean in Stony Brook?

With an average ocean temperature of 73.9°F (23.3°C), August is the month with the warmest seawater in Stony Brook.

What is the least humid month in Stony Brook?

The least humid month is November, with an average relative humidity of 71%.

What is the rainiest month in Stony Brook?

December is the month with the most rainfall in Stony Brook, New York. Rain falls for 11.4 days and accumulates 3.58" (91mm) of precipitation.

What is the month with the shortest days in Stony Brook?

The month with the shortest days in Stony Brook is December, with an average of 9.3h of daylight.

Average temperature
Stony Brook, NY

Average temperature - Stony Brook, NY

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (37.6°F).

Months with the highest average low temperature are July and August (71.1°F).
The coldest month (with the lowest average low temperature) is January (29.1°F).

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Average pressure
Stony Brook, NY

Average pressure - Stony Brook, NY

The month with the highest atmospheric pressure is November (30.09").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed
Stony Brook, NY

Average wind speed - Stony Brook, NY

The windiest month (with the highest average wind speed) is January (12.9mph).
The calmest month (with the lowest average wind speed) is July (8.3mph).

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Average humidity
Stony Brook, NY

Average humidity - Stony Brook, NY

Months with the highest relative humidity are May and June (77%).
The month with the lowest relative humidity is November (71%).

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Average rainfall
Stony Brook, NY

Average rainfall - Stony Brook, NY

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is January (2.05").

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Average rainfall days
Stony Brook, NY

Average rainfall days - Stony Brook, NY

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall
Stony Brook, NY

Average snowfall - Stony Brook, NY

The month with the highest snowfall is March (2.13").
Months with the least snowfall are April, May, June, July, August and September (0").

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Average snowfall days
Stony Brook, NY

Average snowfall days - Stony Brook, NY

The month with the highest number of snowfall days is February (4.4 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature
Stony Brook, NY

Average sea temperature - Stony Brook, NY

The best month for swimming (with the highest average sea temperature) is August (74°F).
The coldest month (with the lowest average sea temperature) is February (39.7°F).

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Average daylight / Average sunshine
Stony Brook, NY

Average daylight / Average sunshine - Stony Brook, NY

The month with the longest days is June (Average daylight: 15.1h).
The month with the shortest days is December (Average daylight: 9.3h).

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.7h).

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Average sunshine days
Stony Brook, NY

Average sunshine days - Stony Brook, NY

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is July (13 days).

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Average UV index
Stony Brook, NY

Average UV index - Stony Brook, NY

Months with the highest UV index are June, July and August (UV index 6).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Stony Brook, NY

Average visibility - Stony Brook, NY

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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