December weather forecast
Mountainville, NJ

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Weather in December

December, the first month of the winter in Mountainville, is also a wintry month, with an average temperature varying between 41°F (5°C) and 29.3°F (-1.5°C).

Temperature

The arrival of December corresponds with a temperature reduction, down from November's cool 50.4°F (10.2°C) to a cold 41°F (5°C). In December, Mountainville reports a consistent average low-temperature of 29.3°F (-1.5°C) during the nights.

Humidity

The months with the highest humidity are February, October and December, with an average relative humidity of 80%.

Rainfall

December is the month with the most rainfall. Rain falls for 12.3 days and accumulates 3.35" (85mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Mountainville, New Jersey. In Mountainville, in December, snow falls for 4 days, with typically accumulated 2.32" (59mm) of snow. In Mountainville, during the entire year, snow falls for 27.8 days and aggregates up to 15.35" (390mm) of snow.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:04 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:23 am and sunset at 4:42 pm EST.

Sunshine

In Mountainville, 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 in Mountainville. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the average person.
Note: In December, the maximum UV index of 2 suggests this advice:
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. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
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Frequently asked questions

How cold does it get in Mountainville in December?

The high-temperature in Mountainville, New Jersey, during December is 41°F (5°C) and the low-temperature is 29.3°F (-1.5°C). In August, the average heat index (a.k.a. 'feels like', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, is evaluated at 87.8°F (31°C).

What is the most humid month in Mountainville?

February, October and December, with an average relative humidity of 80%, are most humid months.

What is the average humidity in December in Mountainville?

In Mountainville, the average relative humidity in December is 80%.

What is the rainiest month in Mountainville?

December is the month with the most rainfall in Mountainville, New Jersey. Rain falls for 12.3 days and accumulates 3.35" (85mm) of precipitation.

How many days does it rain in December in Mountainville?

In December, in Mountainville, the rain falls for 12.3 days. Throughout December, 3.35" (85mm) of precipitation is accumulated.

How much does it snow in Mountainville in December?

In December, it is snowing for 4 days. Throughout December, 2.32" (59mm) of snow is accumulated.

What is the month with the shortest days in Mountainville?

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

What is the average length of the day in December in Mountainville?

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

When are sunrise and sunset in December in Mountainville?

In December, on the first day of the month, sunrise is at 7:04 am and sunset at 4:32 pm. On the last day of the month, in Mountainville, sunrise is at 7:23 am and sunset at 4:42 pm EST.

How long on average sun shines in December in Mountainville?

The average sunshine duration in December is 4.9h.

What is the month with the lowest UV index in Mountainville?

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

What is the UV index intensity in December in Mountainville?

In Mountainville, New Jersey, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a low health risk 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
Mountainville, NJ

Average temperature in December - Mountainville, NJ
  • Average high temperature in December: 41°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: 29.3°F

The month with the highest average low temperature is July (64°F).
The coldest month (with the lowest average low temperature) is January (22.3°F).

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Average pressure in December
Mountainville, NJ

Average pressure in December - Mountainville, 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
Mountainville, NJ

Average wind speed in December - Mountainville, 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
Mountainville, NJ

Average humidity in December - Mountainville, NJ
  • Average humidity in December: 80%

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

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Average rainfall in December
Mountainville, NJ

Average rainfall in December - Mountainville, NJ
  • Average rainfall in December: 3.35"

The wettest month (with the highest rainfall) is December (3.35").
The driest month (with the least rainfall) is September (1.89").

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Average rainfall days in December
Mountainville, NJ

Average rainfall days in December - Mountainville, NJ
  • Average rainfall days in December: 12.3 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is January (8.8 days).

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Average snowfall in December
Mountainville, NJ

Average snowfall in December - Mountainville, NJ
  • Average snowfall in December: 2.32"

The month with the highest snowfall is March (4.76").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Mountainville, NJ

Average snowfall days in December - Mountainville, NJ
  • Average snowfall days in December: 4 days

The months with the highest number of snowfall days are January and February (8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Mountainville, 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
Mountainville, NJ

Average sunshine days in December - Mountainville, NJ
  • Average sunshine days in December: 16.2 days

The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (11 days).

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Average UV index in December
Mountainville, NJ

Average UV index in December - Mountainville, 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
Mountainville, NJ

Average cloud cover in December - Mountainville, 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 34).

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Average visibility in December
Mountainville, NJ

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

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

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Mountainville, New Jersey, USA

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