December weather forecast
Swartswood, NJ

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Weather in December

December, the first month of the winter in Swartswood, is also a wintry month, with an average temperature varying between 27.3°F (-2.6°C) and 38.7°F (3.7°C).

Temperature

A subtle decrease in the average high-temperature marks December, falling from November's chilly 48.4°F (9.1°C) to a cold 38.7°F (3.7°C). In December, Swartswood reports a consistent average low-temperature of 27.3°F (-2.6°C) during the nights.

Humidity

The months with the highest humidity are February and December, with an average relative humidity of 82%.

Rainfall

In Swartswood, New Jersey, in December, during 11.5 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. In Swartswood, during the entire year, the rain falls for 161.1 days and collects up to 28.98" (736mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Swartswood, during December, snow falls for 6.5 days and regularly aggregates up to 2.83" (72mm) of snow. Throughout the year, there are 36.8 snowfall days, and 17.52" (445mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:05 am and sunset at 4:31 pm. On the last day of December, sunrise is at 7:24 am and sunset at 4:40 pm EST.

Sunshine

In December, the average sunshine is 4.6h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, a regular UV index of 1 translates into these guidelines:
While most individuals can withstand prolonged sun exposure, it is imperative that babies, children, and those with sensitive skin always be shielded. The Sun's radiation is especially intense around midday; try to stay in shade during this period. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Updated: Aug 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

Swartswood in December has an average high-temperature of 38.7°F (3.7°C) and an average low-temperature of 27.3°F (-2.6°C). The average heat index (a.k.a. 'real feel', 'feels like'), which combines air temperature and relative humidity, in July is evaluated at 89.6°F (32°C).

What are the most humid months?

The months with the highest humidity are February and December, with an average relative humidity of 82%.

What is the average humidity in December?

The average relative humidity in December in Swartswood is 82%.

How much does it rain in Swartswood in December?

In December, the rain falls for 11.5 days. Throughout December, 2.68" (68mm) of precipitation is accumulated.

How many days does it snow in December?

In December, it is snowing for 6.5 days. Throughout December, 2.83" (72mm) of snow is accumulated.

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

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:05 am and sunset at 4:31 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 4:40 pm EST.

How many hours of sunshine does Swartswood have in December?

In December, the average sunshine duration is 4.6h.

When is the lowest UV index?

The month with the lowest UV index is December, with an average maximum UV index of 1.

How high is the UV index in December?

The average daily maximum UV index in December is 1. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Swartswood, NJ

Average temperature in December - Swartswood, NJ
  • Average high temperature in December: 38.7°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (33.3°F).

  • Average low temperature in December: 27.3°F

The month with the highest average low temperature is July (61.9°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).

Average pressure in December
Swartswood, NJ

Average pressure in December - Swartswood, 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
Swartswood, NJ

Average wind speed in December - Swartswood, NJ
  • Average wind speed in December: 7.1mph

The windiest month (with the highest average wind speed) is March (7.9mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).

Average humidity in December
Swartswood, NJ

Average humidity in December - Swartswood, NJ
  • Average humidity in December: 82%

The months with the highest relative humidity are February and December (82%).
The month with the lowest relative humidity is April (76%).

Average rainfall in December
Swartswood, NJ

Average rainfall in December - Swartswood, NJ
  • Average rainfall in December: 2.68"

The wettest month (with the highest rainfall) is July (3.03").
The driest month (with the least rainfall) is September (1.54").

Average rainfall days in December
Swartswood, NJ

Average rainfall days in December - Swartswood, NJ
  • Average rainfall days in December: 11.5 days

The months with the highest number of rainy days are May and July (17.3 days).
The month with the least rainy days is January (7.5 days).

Average snowfall in December
Swartswood, NJ

Average snowfall in December - Swartswood, NJ
  • Average snowfall in December: 2.83"

The months with the highest snowfall are January and February (4.29").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Swartswood, NJ

Average snowfall days in December - Swartswood, NJ
  • Average snowfall days in December: 6.5 days

The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Swartswood, 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 0min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in December
Swartswood, NJ

Average sunshine days in December - Swartswood, NJ
  • Average sunshine days in December: 15.5 days

The month with the most sunshine days is November (17.2 days).
The month with the least sunshine days is June (11.3 days).

Average UV index in December
Swartswood, NJ

Average UV index in December - Swartswood, NJ
  • Average UV index in December: 1

The month with the highest UV index is June (UV index 6).
The month with the lowest UV index is December (UV index 1).

Average cloud cover in December
Swartswood, NJ

Average cloud cover in December - Swartswood, NJ
  • Average cloud cover in December: 51

The month with the most cloud cover is February (Cloud cover 52).
The months with the least cloud cover are July and August (Cloud cover 37).

Average visibility in December
Swartswood, NJ

Average visibility in December - Swartswood, NJ
  • Average visibility in December: 5mi

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

Swartswood, New Jersey, USA

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