December weather forecast
Glen Gardner, NJ

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Weather in December

The first month of the winter, December, is also an icy month in Glen Gardner, New Jersey, with an average temperature varying between 29.5°F (-1.4°C) and 41°F (5°C).

Temperature

With the beginning of December, the average high-temperature shows a decrease, transitioning from a cool 50.4°F (10.2°C) in November to a cold 41°F (5°C). Glen Gardner reports a consistent average low-temperature of 29.5°F (-1.4°C) throughout December nights.

Humidity

The average relative humidity in December is 80%.

Rainfall

In Glen Gardner, in December, during 8.4 rainfall days, 1.18" (30mm) of precipitation is typically accumulated. In Glen Gardner, New Jersey, during the entire year, the rain falls for 125.9 days and collects up to 14.06" (357mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In December, in Glen Gardner, it is snowing for 3.2 days. Throughout December, 1.06" (27mm) of snow is accumulated. Throughout the year, in Glen Gardner, there are 19.3 snowfall days, and 4.65" (118mm) of snow is accumulated.

Daylight

The month with the shortest days in Glen Gardner is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:33 pm. On the last day of December, sunrise is at 7:23 am and sunset at 4:42 pm EST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index in Glen Gardner 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 exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
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Frequently asked questions

Is it cold in Glen Gardner during December?

In December, in Glen Gardner, the average high-temperature is 41°F (5°C), and the average low-temperature is 29.5°F (-1.4°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), 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 in Glen Gardner?

In December, the average relative humidity in Glen Gardner, New Jersey, is 80%.

How much does it rain in Glen Gardner in December?

In Glen Gardner, New Jersey, during December, the rain falls for 8.4 days and regularly aggregates up to 1.18" (30mm) of precipitation.

How much does it snow in Glen Gardner in December?

In December, it is snowing for 3.2 days. Throughout December, 1.06" (27mm) of snow is accumulated.

What is the month with the shortest days in Glen Gardner?

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 in Glen Gardner?

In December, the average day length is 9h and 19min.

When is the sunrise / sunset in December in Glen Gardner?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:33 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:42 pm EST.

How long on average sun shines in December in Glen Gardner?

In Glen Gardner, the average sunshine duration in December is 4.8h.

What are the months with the lowest UV index in Glen Gardner?

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

What is the UV index intensity in December in Glen Gardner?

The average daily maximum UV index in December in Glen Gardner, New Jersey, is 2. A UV Index of 2, and less, symbolizes a low health risk 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
Glen Gardner, NJ

Average temperature in December - Glen Gardner, NJ
  • Average high temperature in December: 41°F

The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (35.1°F).

  • Average low temperature in December: 29.5°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

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Average pressure in December
Glen Gardner, NJ

Average pressure in December - Glen Gardner, 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).

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Average wind speed in December
Glen Gardner, NJ

Average wind speed in December - Glen Gardner, NJ
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (5mph).

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Average humidity in December
Glen Gardner, NJ

Average humidity in December - Glen Gardner, NJ
  • Average humidity in December: 80%

The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is April (75%).

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Average rainfall in December
Glen Gardner, NJ

Average rainfall in December - Glen Gardner, NJ
  • Average rainfall in December: 1.18"

The wettest month (with the highest rainfall) is July (1.65").
The driest month (with the least rainfall) is September (0.75").

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Average rainfall days in December
Glen Gardner, NJ

Average rainfall days in December - Glen Gardner, NJ
  • Average rainfall days in December: 8.4 days

The month with the highest number of rainy days is May (13.9 days).
The month with the least rainy days is January (6.8 days).

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Average snowfall in December
Glen Gardner, NJ

Average snowfall in December - Glen Gardner, NJ
  • Average snowfall in December: 1.06"

The month with the highest snowfall is February (1.26").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days in December
Glen Gardner, NJ

Average snowfall days in December - Glen Gardner, NJ
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is February (6 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Glen Gardner, NJ

Average daylight in December / Average sunshine in December - Glen Gardner, 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 36min).

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Average sunshine days in December
Glen Gardner, NJ

Average sunshine days in December - Glen Gardner, NJ
  • Average sunshine days in December: 20 days

The month with the most sunshine days is January (20.2 days).
The month with the least sunshine days is May (13.1 days).

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Average UV index in December
Glen Gardner, NJ

Average UV index in December - Glen Gardner, 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
Glen Gardner, NJ

Average cloud cover in December - Glen Gardner, NJ
  • Average cloud cover in December: 49

The months with the most cloud cover are February and December (Cloud cover 49).
The months with the least cloud cover are July and August (Cloud cover 35).

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Average visibility in December
Glen Gardner, NJ

Average visibility in December - Glen Gardner, NJ
  • Average visibility in December: 6mi

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

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Glen Gardner, New Jersey, USA

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