December weather forecast
Trenton, IL

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Weather in December

December, the first month of the winter in Trenton, is also an icy month, with an average temperature ranging between max 42.3°F (5.7°C) and min 30.2°F (-1°C).

Temperature

Trenton's transition into December involves a shift in temperature, receding from a cool 52.9°F (11.6°C) in November to a cold 42.3°F (5.7°C). During the nights in December, the temperature averages to a subzero cold 30.2°F (-1°C).

Humidity

In December, the average relative humidity is 77%.

Rainfall

In December, in Trenton, the rain falls for 8.5 days. Throughout December, 1.89" (48mm) of precipitation is accumulated. Throughout the year, there are 151.1 rainfall days, and 30.43" (773mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall in Trenton. In Trenton, during December, snow falls for 4.5 days and regularly aggregates up to 1.46" (37mm) of snow. Throughout the year, there are 22.4 snowfall days, and 6.1" (155mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 6:58 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:16 am and sunset at 4:47 pm CST.

Sunshine

In Trenton, the average sunshine in December is 4.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 2 in December translates into the following recommendations:
Many can withstand an hour in the sun without burning, yet children must always have protection against sunlight. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

The average high-temperature and low-temperature during December are 42.3°F (5.7°C) and 30.2°F (-1°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which represents the influence of relative humidity on air temperature, is estimated at 93.2°F (34°C).

What is the average humidity in December?

The average relative humidity in December in Trenton is 77%.

How many days does it rain in December?

In Trenton, in December, it is raining for 8.5 days, with typically 1.89" (48mm) of accumulated precipitation.

How many days does it snow in December?

In Trenton, in December, snow falls for 4.5 days, with typically accumulated 1.46" (37mm) of snow.

What is the month with the shortest days?

With an average of 9h and 30min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

In Trenton, the average day length in December is 9h and 31min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:58 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 4:47 pm CST.

How long on average sun shines in December?

In Trenton, the average sunshine duration in December is 4.8h.

When is the lowest UV index?

The months with the lowest UV index in Trenton are January, February, November and December, with an average maximum UV index of 2.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from exposure to the Sun's 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, IL

Average temperature in December - Trenton, IL
  • Average high temperature in December: 42.3°F

The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in December: 30.2°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in December
Trenton, IL

Average pressure in December - Trenton, IL
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

Average wind speed in December
Trenton, IL

Average wind speed in December - Trenton, IL
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in December
Trenton, IL

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

The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Trenton, IL

Average rainfall in December - Trenton, IL
  • Average rainfall in December: 1.89"

The wettest month (with the highest rainfall) is June (3.66").
The driest month (with the least rainfall) is February (1.5").

Average rainfall days in December
Trenton, IL

Average rainfall days in December - Trenton, IL
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (8 days).

Average snowfall in December
Trenton, IL

Average snowfall in December - Trenton, IL
  • Average snowfall in December: 1.46"

The month with the highest snowfall is February (1.85").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Trenton, IL

Average snowfall days in December - Trenton, IL
  • Average snowfall days in December: 4.5 days

The month with the highest number of snowfall days is January (7.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Trenton, IL
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Trenton, IL

Average sunshine days in December - Trenton, IL
  • Average sunshine days in December: 18 days

The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is July (11 days).

Average UV index in December
Trenton, IL

Average UV index in December - Trenton, IL
  • 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, November and December (UV index 2).

Average cloud cover in December
Trenton, IL

Average cloud cover in December - Trenton, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 28).

Average visibility in December
Trenton, IL

Average visibility in December - Trenton, IL
  • 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).

Trenton, Illinois, USA

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