December weather forecast
Mound City, IL

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Weather in December

The first month of the winter, December, is still a chilly month in Mound City, Illinois, with an average temperature ranging between min 33.8°F (1°C) and max 45.5°F (7.5°C).

Temperature

Setting in of December comes with a decrease in the average high-temperature, moving from a mild 55.4°F (13°C) in November to a chilly 45.5°F (7.5°C). During December, the average low-temperature is a cold 33.8°F (1°C).

Humidity

The months with the highest humidity are February, March, May and December, with an average relative humidity of 78%.

Rainfall

In Mound City, in December, during 10.5 rainfall days, 2.91" (74mm) of precipitation is typically accumulated. In Mound City, during the entire year, the rain falls for 156.3 days and collects up to 36.65" (931mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Mound City, in December, snow falls for 1.5 days, with typically accumulated 0.59" (15mm) of snow. In Mound City, during the entire year, snow falls for 11.5 days and aggregates up to 4.88" (124mm) of snow.

Daylight

With an average of 9h and 42min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:52 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:49 pm CST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.
Note: In December, a regular UV index of 2 translates into these guidelines:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Take careful note! The UV radiation of the Sun can be nearly doubled by snow reflection.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the usual temperature for Mound City in December?

In Mound City, in December, the average high-temperature is 45.5°F (7.5°C), and the average low-temperature is 33.8°F (1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines air temperature and relative humidity, in September is evaluated at 86°F (30°C).

What is the most humid month?

The months with the highest humidity are February, March, May and December, with an average relative humidity of 78%.

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in Mound City in December?

In December, the rain falls for 10.5 days. Throughout December, 2.91" (74mm) of precipitation is accumulated.

How much does it snow in December?

In Mound City, in December, during 1.5 snowfall days, 0.59" (15mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 42min of daylight, December has the shortest days of the year.

How many hours of daylight does Mound City have in December?

In December, the average day length is 9h and 40min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:52 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 4:49 pm CST.

How many hours of sunshine does Mound City have in December?

The average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

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

What is the UV index reading in December in Mound City?

In Mound City, the average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Mound City, IL

Average temperature in December - Mound City, IL
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (41.2°F).

  • Average low temperature in December: 33.8°F

The month with the highest average low temperature is July (69.8°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in December
Mound City, IL

Average pressure in December - Mound City, IL
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).

Average wind speed in December
Mound City, IL

Average wind speed in December - Mound City, IL
  • Average wind speed in December: 8.5mph

The windiest months (with the highest average wind speed) are January, February and March (9.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in December
Mound City, IL

Average humidity in December - Mound City, IL
  • Average humidity in December: 78%

The months with the highest relative humidity are February, March, May and December (78%).
The month with the lowest relative humidity is October (69%).

Average rainfall in December
Mound City, IL

Average rainfall in December - Mound City, IL
  • Average rainfall in December: 2.91"

The wettest month (with the highest rainfall) is April (4.21").
The driest month (with the least rainfall) is September (1.42").

Average rainfall days in December
Mound City, IL

Average rainfall days in December - Mound City, IL
  • Average rainfall days in December: 10.5 days

The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (9.8 days).

Average snowfall in December
Mound City, IL

Average snowfall in December - Mound City, IL
  • Average snowfall in December: 0.59"

The month with the highest snowfall is February (1.5").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Mound City, IL

Average snowfall days in December - Mound City, IL
  • Average snowfall days in December: 1.5 days

The month with the highest number of snowfall days is February (3.8 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
Mound City, IL

Average daylight in December / Average sunshine in December - Mound City, IL
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 42min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

Average sunshine days in December
Mound City, IL

Average sunshine days in December - Mound City, IL
  • Average sunshine days in December: 18.4 days

The month with the most sunshine days is October (18.5 days).
The month with the least sunshine days is May (12.3 days).

Average UV index in December
Mound City, IL

Average UV index in December - Mound City, 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 and December (UV index 2).

Average cloud cover in December
Mound City, IL

Average cloud cover in December - Mound City, IL
  • Average cloud cover in December: 47

The month with the most cloud cover is February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 26).

Average visibility in December
Mound City, IL

Average visibility in December - Mound City, 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).

Mound City, Illinois, USA

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