December weather forecast
Francis Mills, NJ

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Weather in December

The first month of the winter, December, is still a chilly month in Francis Mills, New Jersey, with an average temperature varying between 43.9°F (6.6°C) and 32.7°F (0.4°C).

Temperature

December's onset brings a negligible change in high-temperatures, falling from a cool 52.5°F (11.4°C) in November to a frosty 43.9°F (6.6°C). Throughout December, the temperature tends to fall to a consistent average low of 32.7°F (0.4°C).

Humidity

In Francis Mills, the average relative humidity in December is 78%.

Rainfall

In Francis Mills, in December, it is raining for 11 days, with typically 2.95" (75mm) of accumulated precipitation. Throughout the year, in Francis Mills, there are 154.3 rainfall days, and 29.25" (743mm) of precipitation is accumulated.

Snowfall

January through May, November and December are months with snowfall. In Francis Mills, during December, snow falls for 3.2 days and regularly aggregates up to 1.14" (29mm) of snow. In Francis Mills, during the entire year, snow falls for 18.9 days and aggregates up to 8.39" (213mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:01 am and sunset at 4:32 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:42 pm EST.

Sunshine

In Francis Mills, the average sunshine in December is 5h.

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 reading of 2, and below, represents a minimal health vulnerability from unsafe exposure to UV radiation for the ordinary person.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Jun 30, 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 43.9°F (6.6°C) and 32.7°F (0.4°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines air temperature and relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

How many days does it rain in December?

In Francis Mills, in December, during 11 rainfall days, 2.95" (75mm) of precipitation is typically accumulated.

How many days does it snow in December?

In December, it is snowing for 3.2 days. Throughout December, 1.14" (29mm) of snow is accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December in Francis Mills is 9h and 22min.

When is the sunrise / sunset in December?

On the first day of December, sunrise is at 7:01 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:42 pm EST.

How long on average sun shines in December?

In Francis Mills, the average sunshine duration in December is 5h.

What are the months 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 December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from 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
Francis Mills, NJ

Average temperature in December - Francis Mills, NJ
  • Average high temperature in December: 43.9°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 (37.4°F).

  • Average low temperature in December: 32.7°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (25.3°F).

Average pressure in December
Francis Mills, NJ

Average pressure in December - Francis Mills, 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
Francis Mills, NJ

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

The windiest month (with the highest average wind speed) is March (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in December
Francis Mills, NJ

Average humidity in December - Francis Mills, NJ
  • Average humidity in December: 78%

The months with the highest relative humidity are June and October (79%).
The month with the lowest relative humidity is April (73%).

Average rainfall in December
Francis Mills, NJ

Average rainfall in December - Francis Mills, NJ
  • Average rainfall in December: 2.95"

The wettest month (with the highest rainfall) is July (3.5").
The driest month (with the least rainfall) is September (1.69").

Average rainfall days in December
Francis Mills, NJ

Average rainfall days in December - Francis Mills, NJ
  • Average rainfall days in December: 11 days

The month with the highest number of rainy days is July (18 days).
The month with the least rainy days is January (8.4 days).

Average snowfall in December
Francis Mills, NJ

Average snowfall in December - Francis Mills, NJ
  • Average snowfall in December: 1.14"

The month with the highest snowfall is March (3.23").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Francis Mills, NJ

Average snowfall days in December - Francis Mills, NJ
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (5.3 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Francis Mills, NJ

Average daylight in December / Average sunshine in December - Francis Mills, 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: 5h and 0min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Francis Mills, NJ

Average sunshine days in December - Francis Mills, NJ
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is November (19 days).
The month with the least sunshine days is July (10.8 days).

Average UV index in December
Francis Mills, NJ

Average UV index in December - Francis Mills, 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
Francis Mills, NJ

Average cloud cover in December - Francis Mills, NJ
  • Average cloud cover in December: 47

The months with the most cloud cover are February, March and December (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 31).

Average visibility in December
Francis Mills, NJ

Average visibility in December - Francis Mills, 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).

Francis Mills, New Jersey, USA

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