December weather forecast
Montclair, NJ

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Weather in December

The first month of the winter, December, is still a cold month in Montclair, New Jersey, with temperature in the range of an average low of 31.1°F (-0.5°C) and an average high of 41.5°F (5.3°C).

Temperature

The shift to December brings a decrease in the average high-temperature, falling from a fresh 50.7°F (10.4°C) in November to a cold 41.5°F (5.3°C). Montclair's average low-temperature for the month of December records at a subzero cold 31.1°F (-0.5°C).

Humidity

The average relative humidity in December is 77%.

Rainfall

In Montclair, in December, it is raining for 10.6 days, with typically 2.24" (57mm) of accumulated precipitation. Throughout the year, there are 153.3 rainfall days, and 24.92" (633mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Montclair, in December, snow falls for 3.6 days, with typically accumulated 1.18" (30mm) of snow. Throughout the year, in Montclair, there are 22.1 snowfall days, and 8.9" (226mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year in Montclair.
On the first day of December, sunrise is at 7:02 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:39 pm EST.

Sunshine

The average sunshine in December 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 value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 2 during December translates into the following guidance:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Stay sun-safe with clothing that is both closely woven and worn loosely. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
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Frequently asked questions

Is it cold in Montclair during December?

In December, the average high-temperature and low-temperature in Montclair, New Jersey, are 41.5°F (5.3°C) and 31.1°F (-0.5°C) respectively. The average heat index (a.k.a. 'feels like', 'apparent temperature'), which combines relative humidity and air temperature, in August is evaluated at 86°F (30°C).

What is the average humidity in December in Montclair?

The average relative humidity in December is 77%.

How many days does it rain in December in Montclair?

In Montclair, New Jersey, during December, the rain falls for 10.6 days and regularly aggregates up to 2.24" (57mm) of precipitation.

How much does it snow in Montclair in December?

In December, in Montclair, it is snowing for 3.6 days. Throughout December, 1.18" (30mm) of snow is accumulated.

What is the month with the shortest days in Montclair?

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

How many hours of daylight does Montclair have in December?

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

When are sunrise and sunset in December in Montclair?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:29 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:39 pm EST.

How many hours of sunshine does Montclair have in December?

The average sunshine duration in December in Montclair, New Jersey, is 4.9h.

What are the months with the lowest UV index in Montclair?

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

How high is the UV index in December in Montclair?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Montclair, NJ

Average temperature in December - Montclair, NJ
  • Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (35.2°F).

  • Average low temperature in December: 31.1°F

The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

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Average pressure in December
Montclair, NJ

Average pressure in December - Montclair, 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).

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Average wind speed in December
Montclair, NJ

Average wind speed in December - Montclair, NJ
  • Average wind speed in December: 8.1mph

The windiest months (with the highest average wind speed) are January and March (8.8mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).

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Average humidity in December
Montclair, NJ

Average humidity in December - Montclair, NJ
  • Average humidity in December: 77%

The month with the highest relative humidity is February (78%).
The months with the lowest relative humidity are April and August (72%).

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Average rainfall in December
Montclair, NJ

Average rainfall in December - Montclair, NJ
  • Average rainfall in December: 2.24"

The wettest month (with the highest rainfall) is July (3.07").
The driest month (with the least rainfall) is January (1.38").

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Average rainfall days in December
Montclair, NJ

Average rainfall days in December - Montclair, NJ
  • Average rainfall days in December: 10.6 days

The month with the highest number of rainy days is July (17.7 days).
The month with the least rainy days is January (7.6 days).

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Average snowfall in December
Montclair, NJ

Average snowfall in December - Montclair, NJ
  • Average snowfall in December: 1.18"

The month with the highest snowfall is March (3.27").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
Montclair, NJ

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

The month with the highest number of snowfall days is February (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Montclair, NJ

Average daylight in December / Average sunshine in December - Montclair, 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 5min

The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Montclair, NJ

Average sunshine days in December - Montclair, NJ
  • Average sunshine days in December: 17.3 days

The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (10.7 days).

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Average UV index in December
Montclair, NJ

Average UV index in December - Montclair, 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).

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Average cloud cover in December
Montclair, NJ

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

The months with the most cloud cover are February and March (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 31).

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Average visibility in December
Montclair, NJ

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

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

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Montclair, New Jersey, USA

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