December weather forecast
Brightwaters, NY

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Weather in December

The first month of the winter, December, is also a frosty month in Brightwaters, New York, with an average temperature fluctuating between 43.9°F (6.6°C) and 36.9°F (2.7°C).

Temperature

December's onset introduces a mild reduction in the average high-temperature, from a cool 52°F (11.1°C) in November to a chilly 43.9°F (6.6°C). Brightwaters registers a subtle dip to an average of 36.9°F (2.7°C) during the nights of December.

Humidity

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

Rainfall

In Brightwaters, in December, during 11.6 rainfall days, 3.58" (91mm) of precipitation is typically accumulated. Throughout the year, there are 153.2 rainfall days, and 34.45" (875mm) of precipitation is accumulated.

Snowfall

January through March, October through December are months with snowfall. In Brightwaters, in December, snow falls for 1.7 days, with typically accumulated 1.42" (36mm) of snow. Throughout the year, there are 13 snowfall days, and 5.87" (149mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 6:58 am and sunset at 4:26 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:35 pm EST.

Sunshine

The average sunshine in December 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. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 2 during December morphs into the following directions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Jun 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature, in December, in Brightwaters, is 43.9°F (6.6°C), while the average low-temperature is 36.9°F (2.7°C).

What is the average humidity in December?

In December, the average relative humidity is 74%.

How much does it rain in December?

In December, the rain falls for 11.6 days. Throughout December, 3.58" (91mm) of precipitation is accumulated.

How much does it snow in December?

In Brightwaters, during December, snow falls for 1.7 days and regularly aggregates up to 1.42" (36mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 19min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 6:58 am and sunset at 4:26 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:35 pm EST.

How many hours of sunshine does Brightwaters have in December?

The average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

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

What is the UV index reading in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Brightwaters, NY

Average temperature in December - Brightwaters, NY
  • Average high temperature in December: 43.9°F

The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (37.9°F).

  • Average low temperature in December: 36.9°F

The month with the highest average low temperature is August (72°F).
The coldest month (with the lowest average low temperature) is January (30°F).

Average pressure in December
Brightwaters, NY

Average pressure in December - Brightwaters, 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).

Average wind speed in December
Brightwaters, NY

Average wind speed in December - Brightwaters, NY
  • Average wind speed in December: 12.9mph

The windiest month (with the highest average wind speed) is January (13.4mph).
The calmest month (with the lowest average wind speed) is July (8.6mph).

Average humidity in December
Brightwaters, NY

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

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

Average rainfall in December
Brightwaters, NY

Average rainfall in December - Brightwaters, NY
  • Average rainfall in December: 3.58"

The wettest month (with the highest rainfall) is July (3.86").
The driest month (with the least rainfall) is January (2.05").

Average rainfall days in December
Brightwaters, NY

Average rainfall days in December - Brightwaters, NY
  • Average rainfall days in December: 11.6 days

The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is January (7.6 days).

Average snowfall in December
Brightwaters, NY

Average snowfall in December - Brightwaters, NY
  • Average snowfall in December: 1.42"

The month with the highest snowfall is March (1.97").
The months with the least snowfall are April, May, June, July, August and September (0").

Average snowfall days in December
Brightwaters, NY

Average snowfall days in December - Brightwaters, NY
  • Average snowfall days in December: 1.7 days

The month with the highest number of snowfall days is February (4.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

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

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 5min

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

Average sunshine days in December
Brightwaters, NY

Average sunshine days in December - Brightwaters, NY
  • Average sunshine days in December: 17.4 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).

Average UV index in December
Brightwaters, NY

Average UV index in December - Brightwaters, 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).

Average cloud cover in December
Brightwaters, NY

Average cloud cover in December - Brightwaters, NY
  • Average cloud cover in December: 48

The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December
Brightwaters, NY

Average visibility in December - Brightwaters, 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).

Brightwaters, New York, USA

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