December weather forecast
New Vernon, NJ

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Weather in December

December, the first month of the winter in New Vernon, is also an icy month, with an average temperature varying between 41.2°F (5.1°C) and 29.7°F (-1.3°C).

Temperature

As New Vernon enters December, the average high-temperature decreases from the a cool 50.4°F (10.2°C) of November to a wintry 41.2°F (5.1°C). An average minimum temperature of 29.7°F (-1.3°C) is recorded during the month of December.

Humidity

In December, the average relative humidity is 79%.

Rainfall

In New Vernon, during December, the rain falls for 9.9 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 155.7 rainfall days, and 27.64" (702mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In New Vernon, during December, snow falls for 3.7 days and regularly aggregates up to 1.34" (34mm) of snow. In New Vernon, during the entire year, snow falls for 24.7 days and aggregates up to 10.83" (275mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:21 am and sunset at 4:40 pm EST.

Sunshine

In New Vernon, the average sunshine in December is 4.8h.

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 threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, a daily maximum UV index of 2 leads to the following instructions:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is it cold during December?

An average high-temperature, in December, in New Vernon, is 41.2°F (5.1°C) and the average low-temperature is 29.7°F (-1.3°C). The average heat index (a.k.a. 'apparent temperature', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, in August is estimated at 87.8°F (31°C).

What is the average humidity in December?

In New Vernon, the average relative humidity in December is 79%.

How much does it rain in December?

In December, the rain falls for 9.9 days. Throughout December, 2.56" (65mm) of precipitation is accumulated.

How much does it snow in New Vernon in December?

In New Vernon, New Jersey, in December, during 3.7 snowfall days, 1.34" (34mm) of snow is typically accumulated.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 19min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:03 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:40 pm EST.

How many hours of sunshine does New Vernon 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.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
New Vernon, NJ

Average temperature in December - New Vernon, NJ
  • Average high temperature in December: 41.2°F

The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 29.7°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in December
New Vernon, NJ

Average pressure in December - New Vernon, 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
New Vernon, NJ

Average wind speed in December - New Vernon, NJ
  • Average wind speed in December: 7.6mph

The windiest month (with the highest average wind speed) is March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).

Average humidity in December
New Vernon, NJ

Average humidity in December - New Vernon, 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 (74%).

Average rainfall in December
New Vernon, NJ

Average rainfall in December - New Vernon, NJ
  • Average rainfall in December: 2.56"

The wettest month (with the highest rainfall) is July (3.11").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in December
New Vernon, NJ

Average rainfall days in December - New Vernon, NJ
  • Average rainfall days in December: 9.9 days

The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
New Vernon, NJ

Average snowfall in December - New Vernon, NJ
  • Average snowfall in December: 1.34"

The month with the highest snowfall is March (4.09").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
New Vernon, NJ

Average snowfall days in December - New Vernon, NJ
  • Average snowfall days in December: 3.7 days

The month with the highest number of snowfall days is January (7.2 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
New Vernon, NJ

Average daylight in December / Average sunshine in December - New Vernon, 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
New Vernon, NJ

Average sunshine days in December - New Vernon, NJ
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is November (18.7 days).
The month with the least sunshine days is July (11.2 days).

Average UV index in December
New Vernon, NJ

Average UV index in December - New Vernon, 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).

Average cloud cover in December
New Vernon, NJ

Average cloud cover in December - New Vernon, NJ
  • Average cloud cover in December: 49

The months with the most cloud cover are February, March and December (Cloud cover 49).
The month with the least cloud cover is July (Cloud cover 34).

Average visibility in December
New Vernon, NJ

Average visibility in December - New Vernon, NJ
  • Average visibility in December: 6mi

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

New Vernon, New Jersey, USA

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