December weather forecast
Helmetta, NJ

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Weather in December

December, the first month of the winter in Helmetta, is still a chilly month, with an average temperature fluctuating between 32.7°F (0.4°C) and 43.2°F (6.2°C).

Temperature

Helmetta's transition into December involves a gentle shift in temperature, receding from a fresh 52°F (11.1°C) in November to a chilly 43.2°F (6.2°C). Throughout December, Helmetta records an average temperature of 32.7°F (0.4°C) at night.

Humidity

The months with the highest humidity are February, May, October and December, with an average relative humidity of 77%.

Rainfall

In Helmetta, New Jersey, in December, it is raining for 6.5 days, with typically 0.79" (20mm) of accumulated precipitation. Throughout the year, there are 92.9 rainfall days, and 7.32" (186mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In December, it is snowing for 2.2 days. Throughout December, 0.35" (9mm) of snow is accumulated. Throughout the year, in Helmetta, there are 12.7 snowfall days, and 1.5" (38mm) of snow is accumulated.

Daylight

With an average of 9h and 18min of daylight, December has the shortest days of the year in Helmetta, New Jersey.
On the first day of December, sunrise is at 7:02 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:41 pm EST.

Sunshine

In Helmetta, New Jersey, 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 Helmetta. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index, 2 during December, leads to the following recommendations:
Though the majority can handle prolonged sun exposure, it is crucial to always shield babies, children, and those with fair skin. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
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Frequently asked questions

How cold is December in Helmetta?

In December, in Helmetta, the average high-temperature is 43.2°F (6.2°C), and the average low-temperature is 32.7°F (0.4°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is appraised at 87.8°F (31°C).

What are the most humid months in Helmetta?

The months with the highest humidity are February, May, October and December, with an average relative humidity of 77%.

What is the average humidity in December in Helmetta?

In December, the average relative humidity is 77%.

How many days does it rain in December in Helmetta?

In December, in Helmetta, New Jersey, the rain falls for 6.5 days. Throughout December, 0.79" (20mm) of precipitation is accumulated.

How much does it snow in Helmetta in December?

In Helmetta, in December, during 2.2 snowfall days, 0.35" (9mm) of snow is typically accumulated.

What is the month with the shortest days in Helmetta?

December has the shortest days of the year in Helmetta, New Jersey, with an average of 9h and 18min of daylight.

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

In Helmetta, New Jersey, the average day length in December is 9h and 21min.

When is the sunrise / sunset in December in Helmetta?

On the first day of December, sunrise is at 7:02 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:41 pm EST.

How long on average sun shines in December in Helmetta?

The average sunshine duration in December in Helmetta, New Jersey, is 4.9h.

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

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

What is the UV index reading in December in Helmetta?

In Helmetta, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to the Sun's 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
Helmetta, NJ

Average temperature in December - Helmetta, NJ
  • Average high temperature in December: 43.2°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 (37°F).

  • Average low temperature in December: 32.7°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (25°F).

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Average pressure in December
Helmetta, NJ

Average pressure in December - Helmetta, 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).

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Average wind speed in December
Helmetta, NJ

Average wind speed in December - Helmetta, NJ
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).

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Average humidity in December
Helmetta, NJ

Average humidity in December - Helmetta, NJ
  • Average humidity in December: 77%

The months with the highest relative humidity are February, May, October and December (77%).
The months with the lowest relative humidity are April and August (73%).

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Average rainfall in December
Helmetta, NJ

Average rainfall in December - Helmetta, NJ
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is July (0.94").
The driest month (with the least rainfall) is September (0.28").

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Average rainfall days in December
Helmetta, NJ

Average rainfall days in December - Helmetta, NJ
  • Average rainfall days in December: 6.5 days

The month with the highest number of rainy days is July (10.7 days).
The months with the least rainy days are January and November (4.8 days).

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Average snowfall in December
Helmetta, NJ

Average snowfall in December - Helmetta, NJ
  • Average snowfall in December: 0.35"

The month with the highest snowfall is March (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Helmetta, NJ

Average snowfall days in December - Helmetta, NJ
  • Average snowfall days in December: 2.2 days

The month with the highest number of snowfall days is February (3.8 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
Helmetta, NJ

Average daylight in December / Average sunshine in December - Helmetta, 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 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days in December
Helmetta, NJ

Average sunshine days in December - Helmetta, NJ
  • Average sunshine days in December: 23 days

The month with the most sunshine days is January (24.2 days).
The month with the least sunshine days is July (15.7 days).

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Average UV index in December
Helmetta, NJ

Average UV index in December - Helmetta, 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).

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Average cloud cover in December
Helmetta, NJ

Average cloud cover in December - Helmetta, NJ
  • Average cloud cover in December: 48

The months with the most cloud cover are February, March and December (Cloud cover 48).
The months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility in December
Helmetta, NJ

Average visibility in December - Helmetta, 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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Helmetta, New Jersey, USA

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