December weather forecast
Emerson, NJ

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Weather in December

December, the first month of the winter in Emerson, is still a cold month, with an average temperature fluctuating between 30.9°F (-0.6°C) and 41.7°F (5.4°C).

Temperature

Arrival of December comes with a reduction in the average high-temperature, falling from a fresh 50.9°F (10.5°C) in November to a wintry 41.7°F (5.4°C). Emerson usually reports an average low-temperature of 30.9°F (-0.6°C) during the month of December.

Humidity

In Emerson, New Jersey, the average relative humidity in December is 76%.

Rainfall

The month with the most rainfall is December, when the rain falls for 10.7 days and typically aggregates up to 3.46" (88mm) of precipitation.

Snowfall

January through April, November and December are months with snowfall. In Emerson, New Jersey, during December, snow falls for 4.6 days and regularly aggregates up to 1.93" (49mm) of snow. Throughout the year, there are 25.5 snowfall days, and 10.55" (268mm) of snow is accumulated.

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 7:02 am and sunset at 4:28 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:38 pm EST.

Sunshine

The average sunshine in December is 4.7h.

UV index

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum UV index of 2 during December leads to these instructions:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. Limiting sun exposure during midday hours helps in reducing the harmful effects of UV radiation. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In December, in Emerson, the average high-temperature is 41.7°F (5.4°C), and the average low-temperature is 30.9°F (-0.6°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which combines relative humidity and air temperature, in August is estimated at 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 76%.

What is the wettest month?

December is the month with the most rainfall. Rain falls for 10.7 days and accumulates 3.46" (88mm) of precipitation.

How many days does it rain in December?

In Emerson, in December, during 10.7 rainfall days, 3.46" (88mm) of precipitation is typically accumulated.

How much does it snow in December?

In Emerson, New Jersey, during December, snow falls for 4.6 days and regularly aggregates up to 1.93" (49mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

In Emerson, the average day length in December is 9h and 17min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:02 am and sunset at 4:28 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:38 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.7h.

What is the month with the lowest UV index?

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 Emerson, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Emerson, NJ

Average temperature in December - Emerson, NJ
  • Average high temperature in December: 41.7°F

The warmest month (with the highest average high temperature) is July (84.9°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in December: 30.9°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.1°F).

Average pressure in December
Emerson, NJ

Average pressure in December - Emerson, NJ
  • Average pressure in December: 30.07"Hg

The month with the highest atmospheric pressure is November (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Emerson, NJ

Average wind speed in December - Emerson, NJ
  • Average wind speed in December: 8mph

The windiest months (with the highest average wind speed) are January and March (8.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

Average humidity in December
Emerson, NJ

Average humidity in December - Emerson, NJ
  • Average humidity in December: 76%

The month with the highest relative humidity is February (77%).
The month with the lowest relative humidity is August (68%).

Average rainfall in December
Emerson, NJ

Average rainfall in December - Emerson, NJ
  • Average rainfall in December: 3.46"

The wettest month (with the highest rainfall) is December (3.46").
The driest month (with the least rainfall) is September (1.73").

Average rainfall days in December
Emerson, NJ

Average rainfall days in December - Emerson, NJ
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (8.2 days).

Average snowfall in December
Emerson, NJ

Average snowfall in December - Emerson, NJ
  • Average snowfall in December: 1.93"

The month with the highest snowfall is March (3.07").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Emerson, NJ

Average snowfall days in December - Emerson, NJ
  • Average snowfall days in December: 4.6 days

The month with the highest number of snowfall days is January (6.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Emerson, NJ
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 4min

The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 36min).

Average sunshine days in December
Emerson, NJ

Average sunshine days in December - Emerson, NJ
  • Average sunshine days in December: 16.8 days

The months with the most sunshine days are January and November (18.1 days).
The months with the least sunshine days are April and June (12.7 days).

Average UV index in December
Emerson, NJ

Average UV index in December - Emerson, 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
Emerson, NJ

Average cloud cover in December - Emerson, 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 August (Cloud cover 32).

Average visibility in December
Emerson, NJ

Average visibility in December - Emerson, 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).

Emerson, New Jersey, USA

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