December weather forecast
Mount Arlington, NJ

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Weather in December

The first month of the winter, December, is still a cold month in Mount Arlington, New Jersey, with an average temperature ranging between min 27.7°F (-2.4°C) and max 39.2°F (4°C).

Temperature

Mount Arlington's progression into December involves a drop in the average high-temperature, receding from a frosty 48.6°F (9.2°C) in November to an icy 39.2°F (4°C). The temperature dips to an average of 27.7°F (-2.4°C) during December nights.

Humidity

The months with the highest humidity are February, October and December, with an average relative humidity of 81%.

Rainfall

In Mount Arlington, during December, the rain falls for 11 days and regularly aggregates up to 3.54" (90mm) of precipitation. In Mount Arlington, during the entire year, the rain falls for 160.1 days and collects up to 35.87" (911mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Mount Arlington, in December, during 6.7 snowfall days, 3.94" (100mm) of snow is typically accumulated. Throughout the year, there are 40.2 snowfall days, and 23.62" (600mm) 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 7:04 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:40 pm EST.

Sunshine

In December, the average sunshine is 4.6h.

UV index

With an average maximum UV index of 1, December is the month with the lowest UV index in Mount Arlington. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: In December, an average UV index of 1 transforms into the following instructions:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. When the Sun is at its strongest around midday, find shade and limit exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.

Frequently asked questions

How cold is it in December?

During December, Mount Arlington experiences an average high-temperature of 39.2°F (4°C) and a low-temperature of 27.7°F (-2.4°C). In July, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is calculated to be 89.6°F (32°C).

What are the most humid months?

The months with the highest humidity are February, October and December, with an average relative humidity of 81%.

What is the average humidity in December?

In Mount Arlington, the average relative humidity in December is 81%.

How many days does it rain in December?

In December, the rain falls for 11 days. Throughout December, 3.54" (90mm) of precipitation is accumulated.

How much does it snow in December?

In Mount Arlington, in December, snow falls for 6.7 days, with typically accumulated 3.94" (100mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

In Mount Arlington, the average day length in December is 9h and 17min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:04 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:40 pm EST.

How many hours of sunshine does Mount Arlington have in December?

The average sunshine duration in December is 4.6h.

What is the month with the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

What is the UV index reading in December?

In Mount Arlington, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes 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
Mount Arlington, NJ

Average temperature in December - Mount Arlington, NJ
  • Average high temperature in December: 39.2°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 (33.3°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (20.7°F).

Average pressure in December
Mount Arlington, NJ

Average pressure in December - Mount Arlington, 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
Mount Arlington, NJ

Average wind speed in December - Mount Arlington, NJ
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is March (8.1mph).
The calmest month (with the lowest average wind speed) is August (5mph).

Average humidity in December
Mount Arlington, NJ

Average humidity in December - Mount Arlington, NJ
  • Average humidity in December: 81%

The months with the highest relative humidity are February, October and December (81%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Mount Arlington, NJ

Average rainfall in December - Mount Arlington, NJ
  • Average rainfall in December: 3.54"

The wettest month (with the highest rainfall) is July (3.66").
The driest month (with the least rainfall) is September (2.05").

Average rainfall days in December
Mount Arlington, NJ

Average rainfall days in December - Mount Arlington, NJ
  • Average rainfall days in December: 11 days

The months with the highest number of rainy days are May and July (17.4 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Mount Arlington, NJ

Average snowfall in December - Mount Arlington, NJ
  • Average snowfall in December: 3.94"

The month with the highest snowfall is February (5.71").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Mount Arlington, NJ

Average snowfall days in December - Mount Arlington, NJ
  • Average snowfall days in December: 6.7 days

The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Mount Arlington, NJ

Average daylight in December / Average sunshine in December - Mount Arlington, NJ
  • 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 4min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in December
Mount Arlington, NJ

Average sunshine days in December - Mount Arlington, NJ
  • Average sunshine days in December: 15.2 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is June (10.6 days).

Average UV index in December
Mount Arlington, NJ

Average UV index in December - Mount Arlington, NJ
  • Average UV index in December: 1

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Mount Arlington, NJ

Average cloud cover in December - Mount Arlington, NJ
  • Average cloud cover in December: 52

The months with the most cloud cover are February, March and December (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 37).

Average visibility in December
Mount Arlington, NJ

Average visibility in December - Mount Arlington, NJ
  • Average visibility in December: 5mi

The month with the highest visibility is April (6mi).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

Mount Arlington, New Jersey, USA

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