December weather forecast
Rome, IL

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Weather in December

December, the first month of the winter in Rome, is still a cold month, with an average temperature ranging between min 25.7°F (-3.5°C) and max 36°F (2.2°C).

Temperature

The commencement of December involves a temperature shift, with the average high-temperature dropping from a chilly 47.5°F (8.6°C) in November to a cold 36°F (2.2°C). December nights in Rome are marked by an average temperature drop to a freezing cold 25.7°F (-3.5°C).

Humidity

In December, the average relative humidity in Rome is 81%.

Rainfall

In December, the rain falls for 5.7 days. Throughout December, 0.75" (19mm) of precipitation is accumulated. In Rome, during the entire year, the rain falls for 123.4 days and collects up to 15.12" (384mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Rome, in December, snow falls for 6.3 days, with typically accumulated 0.94" (24mm) of snow. Throughout the year, in Rome, there are 27.8 snowfall days, and 6.46" (164mm) of snow is accumulated.

Daylight

The month with the shortest days in Rome is December, with an average of 9h and 18min of daylight.
On the first day of December in Rome, sunrise is at 7:03 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:40 pm CST.

Sunshine

In Rome, Illinois, the average sunshine in December is 4.3h.

UV index

January and December, with an average maximum UV index of 1, are months with the lowest UV index in Rome, Illinois. 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: In December, a regular UV index of 1 translates into these guidelines:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Rome in December?

In Rome, in December, the average high-temperature is 36°F (2.2°C), and the average low-temperature is 25.7°F (-3.5°C). In July, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, is calculated to be 89.6°F (32°C).

What is the average humidity in December in Rome?

In December, the average relative humidity in Rome is 81%.

How many days does it rain in December in Rome?

In Rome, Illinois, in December, it is raining for 5.7 days, with typically 0.75" (19mm) of accumulated precipitation.

How many days does it snow in December in Rome?

In Rome, Illinois, in December, during 6.3 snowfall days, 0.94" (24mm) of snow is typically accumulated.

What is the month with the shortest days in Rome?

December has the shortest days of the year in Rome, Illinois, with an average of 9h and 18min of daylight.

How many hours of daylight does Rome have in December?

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

When is the sunrise / sunset in December in Rome?

On the first day of December, sunrise is at 7:03 am and sunset at 4:30 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:40 pm CST.

How long on average sun shines in December in Rome?

In Rome, Illinois, the average sunshine duration in December is 4.3h.

When is the lowest UV index in Rome?

The months with the lowest UV index in Rome are January and December, with an average maximum UV index of 1.

How high is the UV index in December in Rome?

In December, the average daily maximum UV index is 1. A UV Index of 2, and less, symbolizes 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
Rome, IL

Average temperature in December - Rome, IL
  • Average high temperature in December: 36°F

The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (29.8°F).

  • Average low temperature in December: 25.7°F

The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (18.1°F).

Average pressure in December
Rome, IL

Average pressure in December - Rome, IL
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Rome, IL

Average wind speed in December - Rome, IL
  • Average wind speed in December: 9.8mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

Average humidity in December
Rome, IL

Average humidity in December - Rome, IL
  • Average humidity in December: 81%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Rome, IL

Average rainfall in December - Rome, IL
  • Average rainfall in December: 0.75"

The wettest month (with the highest rainfall) is May (2.36").
The driest month (with the least rainfall) is January (0.67").

Average rainfall days in December
Rome, IL

Average rainfall days in December - Rome, IL
  • Average rainfall days in December: 5.7 days

The month with the highest number of rainy days is May (16.2 days).
The month with the least rainy days is February (4.5 days).

Average snowfall in December
Rome, IL

Average snowfall in December - Rome, IL
  • Average snowfall in December: 0.94"

The month with the highest snowfall is January (1.93").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Rome, IL

Average snowfall days in December - Rome, IL
  • Average snowfall days in December: 6.3 days

The month with the highest number of snowfall days is January (9.2 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
Rome, IL

Average daylight in December / Average sunshine in December - Rome, IL
  • 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 June (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

Average sunshine days in December
Rome, IL

Average sunshine days in December - Rome, IL
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is November (20.2 days).
The month with the least sunshine days is May (12.4 days).

Average UV index in December
Rome, IL

Average UV index in December - Rome, IL
  • Average UV index in December: 1

The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).

Average cloud cover in December
Rome, IL

Average cloud cover in December - Rome, IL
  • Average cloud cover in December: 54

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 31).

Average visibility in December
Rome, IL

Average visibility in December - Rome, IL
  • Average visibility in December: 6mi

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

Rome, Illinois, USA

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