December weather forecast
Montgomery, NJ

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Weather in December

The first month of the winter, December, is also a wintry month in Montgomery, New Jersey, with an average temperature varying between 30.6°F (-0.8°C) and 41.9°F (5.5°C).

Temperature

The move into December indicates a reduction in the average high-temperature, down from November's fresh 50.9°F (10.5°C) to an icy 41.9°F (5.5°C). An average low-temperature of 30.6°F (-0.8°C) is observed during December nights.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In Montgomery, in December, during 7.7 rainfall days, 1.14" (29mm) of precipitation is typically accumulated. In Montgomery, during the entire year, the rain falls for 112.6 days and collects up to 11.77" (299mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall. In Montgomery, during December, snow falls for 2.6 days and regularly aggregates up to 0.79" (20mm) of snow. Throughout the year, there are 16.7 snowfall days, and 3.98" (101mm) of snow is accumulated.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of December, sunrise is at 7:03 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:42 pm EST.

Sunshine

The average sunshine in December is 4.8h.

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 value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: A maximum UV index of 2 in December translates into the following recommendations:
Most individuals face no significant issues with extended sun exposure, but it is always essential to protect children, babies, and those with sensitive skin. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Heed this! Snow reflection can almost augment the UV radiation of the sun by double.
Updated: Aug 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature and low-temperature during December are 41.9°F (5.5°C) and 30.6°F (-0.8°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is computed to be 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 79%.

How much does it rain in December?

In December, the rain falls for 7.7 days. Throughout December, 1.14" (29mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 2.6 days. Throughout December, 0.79" (20mm) of snow is accumulated.

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.

How many hours of daylight does Montgomery have in December?

The average day length in December is 9h and 20min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:42 pm EST.

How many hours of sunshine does Montgomery have in December?

In December, the average sunshine duration is 4.8h.

When is the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health threat from unsafe 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
Montgomery, NJ

Average temperature in December - Montgomery, NJ
  • Average high temperature in December: 41.9°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 (35.4°F).

  • Average low temperature in December: 30.6°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (23°F).

Average pressure in December
Montgomery, NJ

Average pressure in December - Montgomery, NJ
  • Average pressure in December: 30.09"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
Montgomery, NJ

Average wind speed in December - Montgomery, NJ
  • Average wind speed in December: 7.8mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.2mph).

Average humidity in December
Montgomery, NJ

Average humidity in December - Montgomery, NJ
  • Average humidity in December: 79%

The months with the highest relative humidity are February and October (80%).
The month with the lowest relative humidity is April (75%).

Average rainfall in December
Montgomery, NJ

Average rainfall in December - Montgomery, NJ
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is July (1.46").
The driest month (with the least rainfall) is September (0.63").

Average rainfall days in December
Montgomery, NJ

Average rainfall days in December - Montgomery, NJ
  • Average rainfall days in December: 7.7 days

The month with the highest number of rainy days is May (13.1 days).
The month with the least rainy days is January (5.5 days).

Average snowfall in December
Montgomery, NJ

Average snowfall in December - Montgomery, NJ
  • Average snowfall in December: 0.79"

The month with the highest snowfall is March (1.1").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Montgomery, NJ

Average snowfall days in December - Montgomery, NJ
  • Average snowfall days in December: 2.6 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Montgomery, 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 24min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days in December
Montgomery, NJ

Average sunshine days in December - Montgomery, NJ
  • Average sunshine days in December: 21.5 days

The month with the most sunshine days is November (22.2 days).
The month with the least sunshine days is June (15.6 days).

Average UV index in December
Montgomery, NJ

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

The months with the highest UV index are May, 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
Montgomery, NJ

Average cloud cover in December - Montgomery, NJ
  • Average cloud cover in December: 50

The months with the most cloud cover are February and December (Cloud cover 50).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
Montgomery, NJ

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

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

Montgomery, New Jersey, USA

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