December weather forecast and climate
Newark, NJ

A mirrored reflection of Newark City in New Jersey, on the Passaic River
A mirrored reflection of Newark City in New Jersey, on the Passaic River
December, the first month of the winter, in Newark, is also a wintry month, with average temperature fluctuating between 32.9°F (0.5°C) and 42.1°F (5.6°C).

Temperature

In December, the average high-temperature decreases, from a cool 51.3°F (10.7°C) in November, to a cold 42.1°F (5.6°C). The average low-temperature, in December, is 32.9°F (0.5°C).

Humidity

February, May, October and December, with an average relative humidity of 76%, are most humid months in Newark.

Rainfall

The wettest months are July and December, with an average 3.19" (81mm) of rainfall.

Snowfall

Months with snowfall in Newark are January through April, November and December. In Newark, during 3.6 snowfall days, 1.38" (35mm) of snow is typically accumulated. In Newark, during the entire year, snow falls for 20.9 days, and aggregates up to 8.94" (227mm) of snow.

Ocean temperature

In Newark, in December, the average water temperature is 47.1°F (8.4°C).
Note: Swimming in 47.1°F (8.4°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

With an average of 9.3h of daylight, December has the shortest days of the year.

Sunshine

In December, the average sunshine in Newark is 4.9h.

UV index

January through March, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation for the ordinary person.
Note: The daily maximum UV index of 2 interpret into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.

What is the temperature in December in Newark?

In December, in Newark, New Jersey, the average high-temperature is 42.1°F (5.6°C), and the average low-temperature is 32.9°F (0.5°C).

What are the most humid months in Newark?

February, May, October and December, with an average relative humidity of 76%, are most humid months in Newark, New Jersey.

What is the average humidity in December in Newark?

In Newark, the average relative humidity in December is 76%.

How much does it rain in Newark in December?

In December, in Newark, New Jersey, the rain falls for 11.9 days. Throughout December, 3.19" (81mm) of precipitation is accumulated.

What is the rainiest month in Newark?

Months with the most rainfall in Newark are July and December, with an average 3.19" (81mm) of precipitation.

How much does it snow in Newark in December?

In Newark, in December, snow falls for 3.6 days, with typically accumulated 1.38" (35mm) of snow.

How cold is the water in December in Newark?

In Newark, the average seawater temperature in December is 47.1°F (8.4°C). Swimming in 47.1°F (8.4°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 in Newark?

The month with the shortest days in Newark, New Jersey, is December, with an average of 9.3h of daylight.

What is the average length of the day in December in Newark?

The average length of the day in December in Newark is 9.3h.

How long on average sun shines in December in Newark?

In Newark, New Jersey, the average sunshine in December is 4.9h.

When is the lowest UV index in Newark?

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 reading in December in Newark?

In December, the average daily maximum UV index in Newark, New Jersey, is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in December - Newark, NJ
  • Average high temperature in December: 42.1°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 (36.3°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 - Newark, NJ
  • Average pressure in December: 30.08"

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

Average wind speed in December - Newark, NJ
  • Average wind speed in December: 9.2mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).

Average humidity in December - Newark, NJ
  • Average humidity in December: 76%

Months with the highest relative humidity are February, May, October and December (76%).
Months with the lowest relative humidity are April and August (72%).

Average rainfall in December - Newark, NJ
  • Average rainfall in December: 3.19"

The wettest months (with the highest rainfall) are July and December (3.19").
The driest month (with the least rainfall) is September (1.65").

Average rainfall days in December - Newark, NJ
  • Average rainfall days in December: 11.9 days

Months with the highest number of rainy days are May and July (17.1 days).
The month with the least rainy days is November (9.5 days).

Average snowfall in December - Newark, NJ
  • Average snowfall in December: 1.38"

The month with the highest snowfall is March (3.46").
Months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December - Newark, NJ
  • Average snowfall days in December: 3.6 days

The month with the highest number of snowfall days is January (6.1 days).
Months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in December - Newark, 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 - Newark, NJ
  • Average daylight in December: 9.3h

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

  • Average sunshine in December: 4.9h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

Average sunshine days in December - Newark, NJ
  • Average sunshine days in December: 15.6 days

The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is June (11.4 days).

Average UV index in December - Newark, NJ
  • Average UV index in December: 2

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).

Average cloud cover in December - Newark, NJ
  • Average cloud cover in December: 47

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

Average visibility in December - Newark, NJ
  • Average visibility in December: 6mi

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).