December weather forecast
Brookhaven, NY

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Weather in December

December, the first month of the winter in Brookhaven, is still a chilly month, with temperature in the range of an average high of 44.8°F (7.1°C) and an average low of 37°F (2.8°C).

Temperature

December's arrival comes with a mild decrease in the average high-temperature, moving subtly from a cool 52.5°F (11.4°C) in November to a chilly 44.8°F (7.1°C). During December, nights cool slightly to an average low of 37°F (2.8°C).

Humidity

In Brookhaven, the average relative humidity in December is 74%.

Rainfall

The month with the most rainfall in Brookhaven is December, when the rain falls for 12.8 days and typically aggregates up to 3.31" (84mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall in Brookhaven. In Brookhaven, New York, in December, during 3.4 snowfall days, 0.63" (16mm) of snow is typically accumulated. Throughout the year, in Brookhaven, there are 17.9 snowfall days, and 4.57" (116mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:57 am and sunset at 4:24 pm. On the last day of December, in Brookhaven, sunrise is at 7:15 am and sunset at 4:34 pm EST.

Sunshine

In December, the average sunshine is 4.9h.

UV index

January through March and December, with an average maximum UV index of 2, are months with the lowest UV index in Brookhaven. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. A hat with a broad brim is indispensable, filtering out up to half of UV rays. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What are December temperatures in Brookhaven?

The average high-temperature and low-temperature during December are 44.8°F (7.1°C) and 37°F (2.8°C) respectively.

What is the average humidity in December in Brookhaven?

In December, the average relative humidity in Brookhaven is 74%.

What is the rainiest month in Brookhaven?

The month with the most rainfall in Brookhaven is December, when the rain falls for 12.8 days and typically aggregates up to 3.31" (84mm) of precipitation.

How much does it rain in Brookhaven in December?

In December, the rain falls for 12.8 days. Throughout December, 3.31" (84mm) of precipitation is accumulated.

How many days does it snow in December in Brookhaven?

In Brookhaven, New York, in December, during 3.4 snowfall days, 0.63" (16mm) of snow is typically accumulated.

What is the month with the shortest days in Brookhaven?

The month with the shortest days in Brookhaven, New York, is December, with an average of 9h and 18min of daylight.

How many hours of daylight does Brookhaven have in December?

In December, the average day length in Brookhaven, New York, is 9h and 19min.

When are sunrise and sunset in December in Brookhaven?

In December, on the first day of the month, sunrise is at 6:57 am and sunset at 4:24 pm. On the last day of the month, in Brookhaven, New York, sunrise is at 7:15 am and sunset at 4:34 pm EST.

How long on average sun shines in December in Brookhaven?

In Brookhaven, New York, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Brookhaven?

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

How high is the UV index in December in Brookhaven?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Brookhaven, NY

Average temperature in December - Brookhaven, NY
  • Average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in December: 37°F

The months with the highest average low temperature are July and August (71.4°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure in December
Brookhaven, NY

Average pressure in December - Brookhaven, NY
  • Average pressure in December: 30.06"Hg

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

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Average wind speed in December
Brookhaven, NY

Average wind speed in December - Brookhaven, NY
  • Average wind speed in December: 14mph

The windiest month (with the highest average wind speed) is January (14.5mph).
The calmest months (with the lowest average wind speed) are July and August (9.6mph).

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Average humidity in December
Brookhaven, NY

Average humidity in December - Brookhaven, NY
  • Average humidity in December: 74%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is November (71%).

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Average rainfall in December
Brookhaven, NY

Average rainfall in December - Brookhaven, NY
  • Average rainfall in December: 3.31"

The wettest month (with the highest rainfall) is December (3.31").
The driest months (with the least rainfall) are January, February and September (2.01").

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Average rainfall days in December
Brookhaven, NY

Average rainfall days in December - Brookhaven, NY
  • Average rainfall days in December: 12.8 days

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is February (9 days).

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Average snowfall in December
Brookhaven, NY

Average snowfall in December - Brookhaven, NY
  • Average snowfall in December: 0.63"

The month with the highest snowfall is January (1.5").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Brookhaven, NY

Average snowfall days in December - Brookhaven, NY
  • Average snowfall days in December: 3.4 days

The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Brookhaven, NY

Average daylight in December / Average sunshine in December - Brookhaven, NY
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are July and August (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

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Average sunshine days in December
Brookhaven, NY

Average sunshine days in December - Brookhaven, NY
  • Average sunshine days in December: 13.5 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is February (12.8 days).

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Average UV index in December
Brookhaven, NY

Average UV index in December - Brookhaven, NY
  • Average UV index in December: 2

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

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Average cloud cover in December
Brookhaven, NY

Average cloud cover in December - Brookhaven, NY
  • Average cloud cover in December: 49

The month with the most cloud cover is December (Cloud cover 49).
The month with the least cloud cover is August (Cloud cover 26).

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Average visibility in December
Brookhaven, NY

Average visibility in December - Brookhaven, NY
  • Average visibility in December: 6mi

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

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Brookhaven, New York, USA

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