December weather forecast
Trenton, PA

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Weather in December

December, the first month of the winter in Trenton, is also an icy month, with temperature in the range of an average high of 37.9°F (3.3°C) and an average low of 27.5°F (-2.5°C).

Temperature

December's arrival correlates with a reduction in the average high-temperature, down from a chilly 47.3°F (8.5°C) in November to a cold 37.9°F (3.3°C). The average low-temperature during December nights is a freezing cold 27.5°F (-2.5°C).

Humidity

In December, the average relative humidity is 82%.

Rainfall

In Trenton, in December, it is raining for 8.9 days, with typically 1.85" (47mm) of accumulated precipitation. In Trenton, during the entire year, the rain falls for 139.8 days and collects up to 24.69" (627mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In December, it is snowing for 4.9 days. Throughout December, 2.83" (72mm) of snow is accumulated. Throughout the year, there are 33.6 snowfall days, and 20.67" (525mm) 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 December, sunrise is at 7:10 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:46 pm EST.

Sunshine

The average sunshine in December is 4.4h.

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 unprotected exposure to Sun's UV rays for the ordinary person.
Note: The maximum UV index of 2 during December leads to these instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
Updated: Aug 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold in Trenton?

The high-temperature, in December, in Trenton, records 37.9°F (3.3°C), while the low-temperature is 27.5°F (-2.5°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, in July is calculated to be 86°F (30°C).

What is the average humidity in December in Trenton?

In Trenton, the average relative humidity in December is 82%.

How much does it rain in December?

In Trenton, during December, the rain falls for 8.9 days and regularly aggregates up to 1.85" (47mm) of precipitation.

How many days does it snow in December?

In Trenton, in December, snow falls for 4.9 days, with typically accumulated 2.83" (72mm) of snow.

What is the month with the shortest days in Trenton?

The month with the shortest days in Trenton is December, with an average of 9h and 18min of daylight.

What is the average length of the day in December?

In Trenton, the average day length in December is 9h and 18min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:10 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:46 pm EST.

How many hours of sunshine does Trenton have in December?

In Trenton, the average sunshine duration in December is 4.4h.

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.

How high is the UV index in December?

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

Average temperature in December - Trenton, PA
  • Average high temperature in December: 37.9°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.6°F).

  • Average low temperature in December: 27.5°F

The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

Average pressure in December
Trenton, PA

Average pressure in December - Trenton, PA
  • Average pressure in December: 30.09"Hg

The month with the highest atmospheric pressure is November (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Trenton, PA

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

The windiest month (with the highest average wind speed) is March (8.3mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

Average humidity in December
Trenton, PA

Average humidity in December - Trenton, PA
  • Average humidity in December: 82%

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is April (77%).

Average rainfall in December
Trenton, PA

Average rainfall in December - Trenton, PA
  • Average rainfall in December: 1.85"

The wettest month (with the highest rainfall) is May (2.72").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in December
Trenton, PA

Average rainfall days in December - Trenton, PA
  • Average rainfall days in December: 8.9 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (5.8 days).

Average snowfall in December
Trenton, PA

Average snowfall in December - Trenton, PA
  • Average snowfall in December: 2.83"

The month with the highest snowfall is March (4.96").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Trenton, PA

Average snowfall days in December - Trenton, PA
  • Average snowfall days in December: 4.9 days

The month with the highest number of snowfall days is February (8.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Trenton, PA
  • 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 2min

The month with the most sunshine is July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 18min).

Average sunshine days in December
Trenton, PA

Average sunshine days in December - Trenton, PA
  • Average sunshine days in December: 18.5 days

The months with the most sunshine days are January and November (19.6 days).
The month with the least sunshine days is May (11.2 days).

Average UV index in December
Trenton, PA

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

The month with the highest UV index is June (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
Trenton, PA

Average cloud cover in December - Trenton, PA
  • Average cloud cover in December: 54

The months with the most cloud cover are February and December (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 33).

Average visibility in December
Trenton, PA

Average visibility in December - Trenton, PA
  • Average visibility in December: 5mi

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

Trenton, Pennsylvania, USA

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