December weather forecast
Mount Arlington, NJ

Weather in December

December, the first month of the winter, in Mount Arlington, is still a cold month, with average temperature varying between 39.2°F (4°C) and 27.7°F (-2.4°C).

Temperature

In Mount Arlington, the average high-temperature decreases, from a frosty 48.6°F (9.2°C) in November, to a wintry 39.2°F (4°C). The average low-temperature, in December, is 27.7°F (-2.4°C).

Humidity

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

Rainfall

In December, in Mount Arlington, the rain falls for 11 days. Throughout December, 3.54" (90mm) of precipitation is accumulated. Throughout the year, in Mount Arlington, there are 160.1 rainfall days, and 35.87" (911mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through May, October through December. In Mount Arlington, New Jersey,, snow falls for 6.7 days, with typically accumulated 3.94" (100mm) of snow. Throughout the year, there are 40.2 snowfall days, and 23.62" (600mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Mount Arlington, with an average of 9.3h of daylight.

Sunshine

In December, the average sunshine in Mount Arlington is 4.6h.

UV index

December is the month with the lowest UV index in Mount Arlington, New Jersey, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to the UV radiation for ordinary individuals.
Note: The average daily UV index of 1 transform into the following instructions:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What are the most humid months in Mount Arlington?

Months with the highest humidity in Mount Arlington are February, October and December, with an average relative humidity of 81%.

What is the average humidity in December in Mount Arlington?

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

How many days does it rain in December in Mount Arlington?

In Mount Arlington, New Jersey, during December, the rain falls for 11 days and regularly aggregates up to 3.54" (90mm) of precipitation.

How much does it snow in Mount Arlington in December?

In December, in Mount Arlington, it is snowing for 6.7 days. Throughout December, 3.94" (100mm) of snow is accumulated.

What is the month with the shortest days in Mount Arlington?

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

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

The average length of the day in December in Mount Arlington, New Jersey, is 9.3h.

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

The average sunshine in December in Mount Arlington, New Jersey, is 4.6h.

What is the month with the lowest UV index in Mount Arlington?

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?

In Mount Arlington, the average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a low health threat from unprotected exposure to the UV radiation.

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).

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Average pressure in December
Mount Arlington, NJ

Average pressure in December - Mount Arlington, 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").

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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).

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Average humidity in December
Mount Arlington, NJ

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

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

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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").

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Average rainfall days in December
Mount Arlington, NJ

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

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).

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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").
Months with the least snowfall are June, July, August and September (0").

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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).
Months with the least snowfall days are June, July, August and September (0 days).

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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: 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: 4.6h

The month with the most sunshine is July (Average sunshine: 10h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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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).

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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).

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Average cloud cover in December
Mount Arlington, NJ

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

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

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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).
Months with the lowest visibility are January, February, March, May, June, July, August, September, October, November and December (5mi).

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