December weather forecast
Rossmoor, NJ

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Weather in December

The first month of the winter, December, is still a chilly month in Rossmoor, New Jersey, with temperature in the range of an average high of 43.2°F (6.2°C) and an average low of 32.7°F (0.4°C).

Temperature

Rossmoor's transition into December involves a gentle shift in temperature, receding from a fresh 52°F (11.1°C) in November to a frosty 43.2°F (6.2°C). Rossmoor's average low-temperature in December is measured at a cold 32.7°F (0.4°C).

Humidity

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

Rainfall

In Rossmoor, in December, during 6.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated. 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 Rossmoor. In Rossmoor, in December, snow falls for 2.2 days, with typically accumulated 0.35" (9mm) of snow. Throughout the year, there are 12.7 snowfall days, and 1.5" (38mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Rossmoor, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:20 am and sunset at 4:41 pm EST.

Sunshine

In Rossmoor, 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. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for the ordinary person.
Note: An average maximum UV index of 2 in December leads to these recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Updated: Aug 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In December, the average high-temperature and low-temperature are 43.2°F (6.2°C) and 32.7°F (0.4°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 87.8°F (31°C).

What are the most humid months?

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

What is the average humidity in December?

The average relative humidity in December is 77%.

How many days does it rain in December?

In Rossmoor, New Jersey, in December, during 6.5 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Rossmoor, in December, snow falls for 2.2 days, with typically accumulated 0.35" (9mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In December, the average day length is 9h and 21min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:41 pm EST.

How many hours of sunshine does Rossmoor have in December?

In Rossmoor, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

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

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index reading 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
Rossmoor, NJ

Average temperature in December - Rossmoor, 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).

Average pressure in December
Rossmoor, NJ

Average pressure in December - Rossmoor, 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).

Average wind speed in December
Rossmoor, NJ

Average wind speed in December - Rossmoor, 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).

Average humidity in December
Rossmoor, NJ

Average humidity in December - Rossmoor, 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%).

Average rainfall in December
Rossmoor, NJ

Average rainfall in December - Rossmoor, 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").

Average rainfall days in December
Rossmoor, NJ

Average rainfall days in December - Rossmoor, 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).

Average snowfall in December
Rossmoor, NJ

Average snowfall in December - Rossmoor, 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").

Average snowfall days in December
Rossmoor, NJ

Average snowfall days in December - Rossmoor, 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).

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

Average daylight in December / Average sunshine in December - Rossmoor, 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: 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).

Average sunshine days in December
Rossmoor, NJ

Average sunshine days in December - Rossmoor, 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).

Average UV index in December
Rossmoor, NJ

Average UV index in December - Rossmoor, 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).

Average cloud cover in December
Rossmoor, NJ

Average cloud cover in December - Rossmoor, 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).

Average visibility in December
Rossmoor, NJ

Average visibility in December - Rossmoor, 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).

Rossmoor, New Jersey, USA

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