December weather forecast
Winnebago, IL

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Weather in December

December, the first month of the winter in Winnebago, is also a wintry month, with an average temperature varying between 22.5°F (-5.3°C) and 32.4°F (0.2°C).

Temperature

December brings a drop in Winnebago's average high-temperature, falling from a chilly 44.8°F (7.1°C) in November to a wintry 32.4°F (0.2°C). During December, the average low-temperature is a freezing cold 22.5°F (-5.3°C).

Humidity

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

Rainfall

In Winnebago, in December, it is raining for 7.6 days, with typically 1.38" (35mm) of accumulated precipitation. Throughout the year, there are 148.1 rainfall days, and 28.39" (721mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In Winnebago, in December, during 10.1 snowfall days, 2.68" (68mm) of snow is typically accumulated. In Winnebago, Illinois, during the entire year, snow falls for 45.9 days and aggregates up to 15.67" (398mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 12min of daylight.
On the first day of the month, sunrise is at 7:06 am and sunset at 4:25 pm. On the last day of December, sunrise is at 7:25 am and sunset at 4:34 pm CST.

Sunshine

In Winnebago, the average sunshine in December is 4h.

UV index

January, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for the average person.
Note: The UV index of 1 in December translates into these instructions:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Updated: Jul 26, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The average high-temperature and low-temperature during December are 32.4°F (0.2°C) and 22.5°F (-5.3°C) respectively.

What is the average humidity in December?

The average relative humidity in December is 82%.

How many days does it rain in December?

In December, the rain falls for 7.6 days. Throughout December, 1.38" (35mm) of precipitation is accumulated.

How much does it snow in December?

In Winnebago, in December, during 10.1 snowfall days, 2.68" (68mm) of snow is typically accumulated.

What is the month with the shortest days?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

What is the average length of the day in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 4:25 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:34 pm CST.

How many hours of sunshine does Winnebago have in December?

The average sunshine duration in December is 4h.

What is the month with the lowest UV index?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 1. A UV Index reading of 2, and below, represents a low health threat 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
Winnebago, IL

Average temperature in December - Winnebago, IL
  • Average high temperature in December: 32.4°F

The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).

  • Average low temperature in December: 22.5°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).

Average pressure in December
Winnebago, IL

Average pressure in December - Winnebago, IL
  • Average pressure in December: 30.09"Hg

The months with the highest atmospheric pressure are January and February (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Winnebago, IL

Average wind speed in December - Winnebago, IL
  • Average wind speed in December: 9.3mph

The windiest month (with the highest average wind speed) is April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in December
Winnebago, IL

Average humidity in December - Winnebago, IL
  • Average humidity in December: 82%

The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).

Average rainfall in December
Winnebago, IL

Average rainfall in December - Winnebago, IL
  • Average rainfall in December: 1.38"

The wettest month (with the highest rainfall) is June (4.02").
The driest month (with the least rainfall) is February (1.26").

Average rainfall days in December
Winnebago, IL

Average rainfall days in December - Winnebago, IL
  • Average rainfall days in December: 7.6 days

The month with the highest number of rainy days is May (19 days).
The month with the least rainy days is February (4.3 days).

Average snowfall in December
Winnebago, IL

Average snowfall in December - Winnebago, IL
  • Average snowfall in December: 2.68"

The month with the highest snowfall is January (4.88").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Winnebago, IL

Average snowfall days in December - Winnebago, IL
  • Average snowfall days in December: 10.1 days

The month with the highest number of snowfall days is January (13 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
Winnebago, IL

Average daylight in December / Average sunshine in December - Winnebago, IL
  • Average daylight in December: 9h and 1min

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

  • Average sunshine in December: 4h and 0min

The month with the most sunshine is July (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Winnebago, IL

Average sunshine days in December - Winnebago, IL
  • Average sunshine days in December: 16.1 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (9.8 days).

Average UV index in December
Winnebago, IL

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

The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January, November and December (UV index 1).

Average cloud cover in December
Winnebago, IL

Average cloud cover in December - Winnebago, IL
  • Average cloud cover in December: 59

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 33).

Average visibility in December
Winnebago, IL

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

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

Winnebago, Illinois, USA

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