December weather forecast
Trenton, IA

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Weather in December

The first month of the winter, December, is also an icy month in Trenton, Iowa, with temperature in the range of an average high of 36°F (2.2°C) and an average low of 24.6°F (-4.1°C).

Temperature

The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a frosty 48°F (8.9°C) in November to an icy 36°F (2.2°C). Throughout December, the temperature tends to fall to a consistent average low of 24.6°F (-4.1°C).

Humidity

In Trenton, the average relative humidity in December is 80%.

Rainfall

The months with the least rainfall are February and December Rain falls for 7.3 days and accumulates 1.38" (35mm) of rain.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 6 days. Throughout December, 1.65" (42mm) of snow is accumulated. In Trenton, during the entire year, snow falls for 30.7 days and aggregates up to 15" (381mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:12 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:31 am and sunset at 4:48 pm CST.

Sunshine

The average sunshine in December is 4.5h.

UV index

In Trenton, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Be cautious! The UV radiation from the Sun can be magnified almost twofold by snow reflection.
Updated: Aug 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The high-temperature, in December, in Trenton, is 36°F (2.2°C), while the low-temperature averages to 24.6°F (-4.1°C). In August, the average heat index (a.k.a. 'real feel', 'feels like'), which takes the relative humidity and factors it into the air temperature reading, is estimated at 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 80%.

What is the driest month?

The months with the least rainfall are February and December Rain falls for 7.3 days and accumulates 1.38" (35mm) of rain.

How many days does it rain in December?

In Trenton, in December, it is raining for 7.3 days, with typically 1.38" (35mm) of accumulated precipitation.

How many days does it snow in December?

In Trenton, in December, snow falls for 6 days, with typically accumulated 1.65" (42mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December is 9h and 17min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:12 am and sunset at 4:38 pm. On the last day of the month, sunrise is at 7:31 am and sunset at 4:48 pm CST.

How many hours of sunshine does Trenton have in December?

In December, the average sunshine duration is 4.5h.

What is the UV index intensity in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk 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, IA

Average temperature in December - Trenton, IA
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 24.6°F

The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

Average pressure in December
Trenton, IA

Average pressure in December - Trenton, IA
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).

Average wind speed in December
Trenton, IA

Average wind speed in December - Trenton, IA
  • Average wind speed in December: 10.1mph

The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.9mph).

Average humidity in December
Trenton, IA

Average humidity in December - Trenton, IA
  • Average humidity in December: 80%

The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Trenton, IA

Average rainfall in December - Trenton, IA
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is May (4.29").
The driest months (with the least rainfall) are February and December (1.38").

Average rainfall days in December
Trenton, IA

Average rainfall days in December - Trenton, IA
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is February (4.6 days).

Average snowfall in December
Trenton, IA

Average snowfall in December - Trenton, IA
  • Average snowfall in December: 1.65"

The month with the highest snowfall is January (4.76").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Trenton, IA

Average snowfall days in December - Trenton, IA
  • Average snowfall days in December: 6 days

The month with the highest number of snowfall days is January (9.6 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, IA

Average daylight in December / Average sunshine in December - Trenton, IA
  • 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 3min

The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

Average sunshine days in December
Trenton, IA

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

The month with the most sunshine days is October (18.4 days).
The month with the least sunshine days is May (10.6 days).

Average UV index in December
Trenton, IA

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

The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).

Average cloud cover in December
Trenton, IA

Average cloud cover in December - Trenton, IA
  • Average cloud cover in December: 53

The month with the most cloud cover is January (Cloud cover 56).
The months with the least cloud cover are July, August and September (Cloud cover 31).

Average visibility in December
Trenton, IA

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

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

Trenton, Iowa, USA

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