December weather forecast
Port Reading, NJ

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Weather in December

December, the first month of the winter in Port Reading, is also an icy month, with an average temperature varying between 42.4°F (5.8°C) and 32.9°F (0.5°C).

Temperature

With December's onset, the weather reveals a slight temperature decrease, transitioning from a fresh 51.3°F (10.7°C) in November to an icy 42.4°F (5.8°C). Port Reading observes an average low-temperature of 32.9°F (0.5°C) during December.

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 7.3 days. Throughout December, 0.83" (21mm) of precipitation is accumulated. Throughout the year, there are 110.2 rainfall days, and 8.9" (226mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Port Reading, during December, snow falls for 2.8 days and regularly aggregates up to 0.24" (6mm) of snow. Throughout the year, there are 14.5 snowfall days, and 1.85" (47mm) of snow is accumulated.

Ocean temperature

In December, the average ocean temperature is 47.1°F (8.4°C).
Note: Swimming in 47.1°F (8.4°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.

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 7:01 am and sunset at 4:30 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:40 pm EST.

Sunshine

In Port Reading, 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 reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index of 2 during December translates into the following directions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

The average high-temperature and low-temperature during December are 42.4°F (5.8°C) and 32.9°F (0.5°C) respectively. In August, the average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, is appraised at 86°F (30°C).

What is the average humidity in December?

The average relative humidity in December is 76%.

How much does it rain in Port Reading in December?

In Port Reading, in December, it is raining for 7.3 days, with typically 0.83" (21mm) of accumulated precipitation.

How much does it snow in December?

In Port Reading, in December, during 2.8 snowfall days, 0.24" (6mm) of snow is typically accumulated.

What is the ocean temperature in December?

In Port Reading, the average seawater temperature in December is 47.1°F (8.4°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the month with the shortest days?

The month with the shortest days is December, 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 20min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:01 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:40 pm EST.

How long on average sun shines in December?

In December, the average sunshine duration is 4.9h.

What is the month with the lowest UV index in Port Reading?

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

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk 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
Port Reading, NJ

Average temperature in December - Port Reading, NJ
  • Average high temperature in December: 42.4°F

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (36.5°F).

  • Average low temperature in December: 32.9°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).

Average pressure in December
Port Reading, NJ

Average pressure in December - Port Reading, NJ
  • Average pressure in December: 30.08"Hg

The month with the highest atmospheric pressure is November (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Port Reading, NJ

Average wind speed in December - Port Reading, NJ
  • Average wind speed in December: 8.9mph

The windiest months (with the highest average wind speed) are January and March (9.6mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

Average humidity in December
Port Reading, NJ

Average humidity in December - Port Reading, NJ
  • Average humidity in December: 76%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (72%).

Average rainfall in December
Port Reading, NJ

Average rainfall in December - Port Reading, NJ
  • Average rainfall in December: 0.83"

The wettest month (with the highest rainfall) is July (1.22").
The driest month (with the least rainfall) is September (0.39").

Average rainfall days in December
Port Reading, NJ

Average rainfall days in December - Port Reading, NJ
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (12.7 days).
The month with the least rainy days is January (4.9 days).

Average snowfall in December
Port Reading, NJ

Average snowfall in December - Port Reading, NJ
  • Average snowfall in December: 0.24"

The month with the highest snowfall is March (0.83").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Port Reading, NJ

Average snowfall days in December - Port Reading, NJ
  • Average snowfall days in December: 2.8 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 sea temperature in December
Port Reading, NJ

Average sea temperature in December - Port Reading, NJ
  • Average sea temperature in December: 47.2°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 (39.7°F).

Average daylight in December /
Average sunshine in December
Port Reading, NJ

Average daylight in December / Average sunshine in December - Port Reading, NJ
  • 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 36min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Port Reading, NJ

Average sunshine days in December - Port Reading, NJ
  • Average sunshine days in December: 21.3 days

The month with the most sunshine days is January (22.6 days).
The month with the least sunshine days is July (14.8 days).

Average UV index in December
Port Reading, NJ

Average UV index in December - Port Reading, NJ
  • 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 Reading, NJ

Average cloud cover in December - Port Reading, NJ
  • Average cloud cover in December: 47

The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 30).

Average visibility in December
Port Reading, NJ

Average visibility in December - Port Reading, NJ
  • 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 Reading, New Jersey, USA

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