December weather forecast
Port Washington North, NY

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Weather in December

The first month of the winter, December, is still a cold month in Port Washington North, New York, with an average temperature varying between 33.8°F (1°C) and 42.1°F (5.6°C).

Temperature

With December's onset, the weather reveals a slight temperature decrease, transitioning from a fresh 50.9°F (10.5°C) in November to an icy 42.1°F (5.6°C). Port Washington North encounters a small divergence from daytime high temperatures, averaging a low-temperature of 33.8°F (1°C) during December nights.

Humidity

The months with the highest humidity are February, May and December, with an average relative humidity of 75%.

Rainfall

December is the month with the most rainfall. Rain falls for 13 days and accumulates 3.98" (101mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Port Washington North, in December, snow falls for 3.9 days, with typically accumulated 1.69" (43mm) of snow. In Port Washington North, during the entire year, snow falls for 23 days and aggregates up to 8.23" (209mm) of snow.

Ocean temperature

In Port Washington North, in December, the average water temperature is 48°F (8.9°C).
Note: Taking a dip in 48°F (8.9°C) can be perilous. Submersion in temperatures under 50°F (10°C) triggers severe cold shock accompanied by hyperventilation.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:00 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:37 pm EST.

Sunshine

In Port Washington North, the average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum UV index of 2 during December translates into these guidelines:
Extended sunlight exposure does not pose significant problems for most people, except for children, infants, and people with fair skin who always need shielding. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

December temperatures vary between a high-temperature of 42.1°F (5.6°C) and a low-temperature of 33.8°F (1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 84.2°F (29°C).

What is the most humid month?

The months with the highest humidity are February, May and December, with an average relative humidity of 75%.

What is the average humidity in December?

The average relative humidity in December in Port Washington North, New York, is 75%.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 13 days and accumulates 3.98" (101mm) of precipitation.

How much does it rain in December?

In Port Washington North, in December, during 13 rainfall days, 3.98" (101mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Port Washington North, in December, snow falls for 3.9 days, with typically accumulated 1.69" (43mm) of snow.

What is the water temperature in December?

In Port Washington North, the average seawater temperature in December is 48°F (8.9°C). Swimming in 48°F (8.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

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?

In December, the average day length is 9h and 18min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:27 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:37 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.9h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to UV radiation.
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
Port Washington North, NY

Average temperature in December - Port Washington North, NY
  • Average high temperature in December: 42.1°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in December: 33.8°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (26.8°F).

Average pressure in December
Port Washington North, NY

Average pressure in December - Port Washington North, NY
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Port Washington North, NY

Average wind speed in December - Port Washington North, NY
  • Average wind speed in December: 10mph

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.8mph).

Average humidity in December
Port Washington North, NY

Average humidity in December - Port Washington North, NY
  • Average humidity in December: 75%

The months with the highest relative humidity are February, May and December (75%).
The month with the lowest relative humidity is August (70%).

Average rainfall in December
Port Washington North, NY

Average rainfall in December - Port Washington North, NY
  • Average rainfall in December: 3.98"

The wettest month (with the highest rainfall) is December (3.98").
The driest month (with the least rainfall) is February (2.36").

Average rainfall days in December
Port Washington North, NY

Average rainfall days in December - Port Washington North, NY
  • Average rainfall days in December: 13 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (9.2 days).

Average snowfall in December
Port Washington North, NY

Average snowfall in December - Port Washington North, NY
  • Average snowfall in December: 1.69"

The month with the highest snowfall is March (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Port Washington North, NY

Average snowfall days in December - Port Washington North, NY
  • Average snowfall days in December: 3.9 days

The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in December
Port Washington North, NY

Average sea temperature in December - Port Washington North, NY
  • Average sea temperature in December: 48.1°F

The best month for swimming (with the highest average sea temperature) is August (74.1°F).
The coldest month (with the lowest average sea temperature) is February (39.9°F).

Average daylight in December /
Average sunshine in December
Port Washington North, NY

Average daylight in December / Average sunshine in December - Port Washington North, 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 month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Port Washington North, NY

Average sunshine days in December - Port Washington North, NY
  • Average sunshine days in December: 14.9 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (11.1 days).

Average UV index in December
Port Washington North, NY

Average UV index in December - Port Washington North, 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, November and December (UV index 2).

Average cloud cover in December
Port Washington North, NY

Average cloud cover in December - Port Washington North, NY
  • Average cloud cover in December: 48

The month with the most cloud cover is December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 29).

Average visibility in December
Port Washington North, NY

Average visibility in December - Port Washington North, 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).

Port Washington North, New York, USA

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