December weather forecast
National Park, NJ

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Weather in December

The first month of the winter, December, is still a chilly month in National Park, New Jersey, with an average temperature fluctuating between 32.7°F (0.4°C) and 44.1°F (6.7°C).

Temperature

The transition to December results in a modest reduction in average high-temperature, moving from a fresh 52.7°F (11.5°C) in November to a chilly 44.1°F (6.7°C). The month of December records an average low-temperature of 32.7°F (0.4°C).

Humidity

February, October and December, with an average relative humidity of 77%, are the most humid months.

Rainfall

In December, the rain falls for 9.6 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. Throughout the year, there are 142 rainfall days, and 24.41" (620mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In National Park, in December, during 1.5 snowfall days, 0.75" (19mm) of snow is typically accumulated. In National Park, during the entire year, snow falls for 11.3 days and aggregates up to 6.18" (157mm) of snow.

Daylight

With an average of 9h and 24min of daylight, December has the shortest days of the year in National Park.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:36 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:46 pm EST.

Sunshine

In National Park, New Jersey, the average sunshine in December is 5.1h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in National Park, New Jersey. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
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Frequently asked questions

How cold does it get in National Park in December?

The high-temperature, in December, in National Park, records 44.1°F (6.7°C), while the low-temperature is 32.7°F (0.4°C). In August, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 91.4°F (33°C).

What are the most humid months in National Park?

The months with the highest humidity in National Park, New Jersey, are February, October and December, with an average relative humidity of 77%.

What is the average humidity in December in National Park?

In National Park, the average relative humidity in December is 77%.

How much does it rain in National Park in December?

In December, in National Park, the rain falls for 9.6 days. Throughout December, 2.4" (61mm) of precipitation is accumulated.

How many days does it snow in December in National Park?

In National Park, in December, snow falls for 1.5 days, with typically accumulated 0.75" (19mm) of snow.

What is the month with the shortest days in National Park?

December has the shortest days of the year in National Park, New Jersey, with an average of 9h and 24min of daylight.

What is the average length of the day in December in National Park?

In National Park, New Jersey, the average day length in December is 9h and 24min.

When are sunrise and sunset in December in National Park?

On the first day of December, sunrise is at 7:03 am and sunset at 4:36 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:46 pm EST.

How many hours of sunshine does National Park have in December?

In December, the average sunshine duration in National Park, New Jersey, is 5.1h.

What is the month with the lowest UV index in National Park?

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in National Park.

What is the UV index intensity in December in National Park?

In December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents 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
National Park, NJ

Average temperature in December - National Park, NJ
  • Average high temperature in December: 44.1°F

The warmest month (with the highest average high temperature) is July (86°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in December: 32.7°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).

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Average pressure in December
National Park, NJ

Average pressure in December - National Park, NJ
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

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Average wind speed in December
National Park, NJ

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

The windiest months (with the highest average wind speed) are February, March and April (8.5mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

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Average humidity in December
National Park, NJ

Average humidity in December - National Park, NJ
  • Average humidity in December: 77%

The months with the highest relative humidity are February, October and December (77%).
The month with the lowest relative humidity is April (71%).

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Average rainfall in December
National Park, NJ

Average rainfall in December - National Park, NJ
  • Average rainfall in December: 2.4"

The wettest month (with the highest rainfall) is August (2.95").
The driest month (with the least rainfall) is January (1.46").

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Average rainfall days in December
National Park, NJ

Average rainfall days in December - National Park, NJ
  • Average rainfall days in December: 9.6 days

The month with the highest number of rainy days is July (16.9 days).
The month with the least rainy days is January (6.6 days).

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Average snowfall in December
National Park, NJ

Average snowfall in December - National Park, NJ
  • Average snowfall in December: 0.75"

The month with the highest snowfall is March (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in December
National Park, NJ

Average snowfall days in December - National Park, NJ
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is January (3.3 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
National Park, NJ

Average daylight in December / Average sunshine in December - National Park, 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 24min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 54min).

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Average sunshine days in December
National Park, NJ

Average sunshine days in December - National Park, NJ
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is July (12.1 days).

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Average UV index in December
National Park, NJ

Average UV index in December - National Park, 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, November and December (UV index 2).

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Average cloud cover in December
National Park, NJ

Average cloud cover in December - National Park, NJ
  • Average cloud cover in December: 46

The month with the most cloud cover is February (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

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Average visibility in December
National Park, NJ

Average visibility in December - National Park, NJ
  • Average visibility in December: 6mi

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

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National Park, New Jersey, USA

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