December weather forecast and climate
Trenton, NJ

A full aerial view of Trenton, New Jersey, with the George Washington statue
A full aerial view of Trenton, New Jersey, with the George Washington statue

Weather in December

The first month of the winter, December, is still a chilly month in Trenton, New Jersey, with average temperature varying between 32°F (0°C) and 43.2°F (6.2°C).

Temperature

In December, the average high-temperature marginally drops, from a cool 52°F (11.1°C) in November, to a chilly 43.2°F (6.2°C). In December, in Trenton, the average low-temperature is 32°F (0°C).

Humidity

The average relative humidity is 77%.

Rainfall

In Trenton, during 11.2 rainfall days, 3.15" (80mm) of precipitation is typically accumulated. In Trenton, during the entire year, the rain falls for 156.8 days and collects up to 31.81" (808mm) of precipitation.

Snowfall

Months with snowfall in Trenton are January through May, October through December. In Trenton, in December, during 3 snowfall days, 1.3" (33mm) of snow is typically accumulated. Throughout the year, there are 16.6 snowfall days, and 8.86" (225mm) of snow is accumulated.

Daylight

December has the shortest days of the year in Trenton, with an average of 9.4h of daylight.

Sunshine

The average sunshine is 5h.

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 minimal health vulnerability from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Trenton?

The average high-temperature, in December, in Trenton, New Jersey, is 43.2°F (6.2°C), while the average low-temperature is 32°F (0°C).

What is the average humidity in December in Trenton?

In December, the average relative humidity is 77%.

How many days does it rain in December in Trenton?

In Trenton, New Jersey, in December, during 11.2 rainfall days, 3.15" (80mm) of precipitation is typically accumulated.

How many days does it snow in December in Trenton?

In Trenton, New Jersey, in December, during 3 snowfall days, 1.3" (33mm) of snow is typically accumulated.

What is the month with the shortest days in Trenton?

With an average of 9.4h of daylight, December has the shortest days of the year in Trenton, New Jersey.

How many hours of daylight does Trenton have in December?

In December, the average length of the day in Trenton, New Jersey, is 9.4h.

How many hours of sunshine does Trenton have in December?

The average sunshine in December in Trenton is 5h.

When is the lowest UV index in Trenton?

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

How high is the UV index in December in Trenton?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to the UV radiation.

Average temperature in December
Trenton, NJ

Average temperature in December - Trenton, NJ
  • Average high temperature in December: 43.2°F

The warmest month (with the highest average high temperature) is July (85.1°F).
The month with the lowest average high temperature is January (36.9°F).

  • Average low temperature in December: 32°F

The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

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Average pressure in December
Trenton, NJ

Average pressure in December - Trenton, NJ
  • Average pressure in December: 30.09"

The month with the highest atmospheric pressure is November (30.11").
The month with the lowest atmospheric pressure is June (29.93").

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Average wind speed in December
Trenton, NJ

Average wind speed in December - Trenton, NJ
  • Average wind speed in December: 7.7mph

The windiest month (with the highest average wind speed) is March (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.4mph).

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Average humidity in December
Trenton, NJ

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

Months with the highest relative humidity are February and October (78%).
The month with the lowest relative humidity is April (72%).

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Average rainfall in December
Trenton, NJ

Average rainfall in December - Trenton, NJ
  • Average rainfall in December: 3.15"

The wettest month (with the highest rainfall) is July (3.74").
The driest month (with the least rainfall) is January (1.85").

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Average rainfall days in December
Trenton, NJ

Average rainfall days in December - Trenton, NJ
  • Average rainfall days in December: 11.2 days

The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall in December
Trenton, NJ

Average snowfall in December - Trenton, NJ
  • Average snowfall in December: 1.3"

The month with the highest snowfall is March (2.72").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in December
Trenton, NJ

Average snowfall days in December - Trenton, NJ
  • Average snowfall days in December: 3 days

The month with the highest number of snowfall days is January (4.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Trenton, NJ
  • Average daylight in December: 9.4h

The month with the longest days is June (Average daylight: 15h).
The month with the shortest days is December (Average daylight: 9.4h).

  • Average sunshine in December: 5h

The month with the most sunshine is July (Average sunshine: 10.6h).
The month with the least sunshine is February (Average sunshine: 4.8h).

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Average sunshine days in December
Trenton, NJ

Average sunshine days in December - Trenton, NJ
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is November (20.6 days).
The month with the least sunshine days is July (9.3 days).

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Average UV index in December
Trenton, NJ

Average UV index in December - Trenton, NJ
  • Average UV index in December: 2

Months with the highest UV index are May, June, July and August (UV index 6).
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
Trenton, NJ

Average cloud cover in December - Trenton, NJ
  • Average cloud cover in December: 47

Months with the most cloud cover are February, March and December (Cloud cover 47).
Months with the least cloud cover are July and August (Cloud cover 32).

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Average visibility in December
Trenton, NJ

Average visibility in December - Trenton, NJ
  • Average visibility in December: 6mi

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

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