December weather forecast
Posen, IL

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Weather in December

The first month of the winter, December, is still a cold month in Posen, Illinois, with an average temperature ranging between min 25.9°F (-3.4°C) and max 35.6°F (2°C).

Temperature

During Posen's transition into December, the average high-temperature lessens, moving from a frosty 46.9°F (8.3°C) in November to a cold 35.6°F (2°C). Throughout December, Posen witnesses a nighttime temperature average of 25.9°F (-3.4°C).

Humidity

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

Rainfall

The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

Months with snowfall in Posen, Illinois, are January through April, October through December. In Posen, during December, snow falls for 9.1 days and regularly aggregates up to 2.76" (70mm) of snow. In Posen, during the entire year, snow falls for 44.6 days and aggregates up to 16.46" (418mm) of snow.

Daylight

The month with the shortest days in Posen is December, with an average of 9h and 12min of daylight.
On the first day of December in Posen, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:30 pm CST.

Sunshine

In December, the average sunshine is 4h.

UV index

The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for average individuals.
Note: In December, a regular UV index of 1 translates into these guidelines:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in Posen in December?

The high-temperature, in December, in Posen, is 35.6°F (2°C), while the low-temperature averages to 25.9°F (-3.4°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in July is calculated to be 87.8°F (31°C).

What is the average humidity in December in Posen?

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

What is the driest month in Posen?

The month with the least rainfall in Posen is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.

How much does it rain in Posen in December?

In Posen, Illinois, in December, it is raining for 7.9 days, with typically 1.54" (39mm) of accumulated precipitation.

How many days does it snow in December in Posen?

In Posen, in December, during 9.1 snowfall days, 2.76" (70mm) of snow is typically accumulated.

What is the month with the shortest days in Posen?

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

What is the average length of the day in December in Posen?

In December, the average day length is 9h and 13min.

What time are sunrise and sunset in December in Posen?

In December, on the first day of the month, sunrise is at 6:58 am and sunset at 4:21 pm. On the last day of the month, sunrise is at 7:17 am and sunset at 4:30 pm CST.

How many hours of sunshine does Posen have in December?

The average sunshine duration in December in Posen is 4h.

When is the lowest UV index in Posen?

The month with the lowest UV index in Posen, Illinois, is December, with an average maximum UV index of 1.

What is the UV index intensity in December in Posen?

In December, the average daily maximum UV index is 1. A UV Index estimate of 2, and below, represents a minimal hazard to health 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
Posen, IL

Average temperature in December - Posen, IL
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).

  • Average low temperature in December: 25.9°F

The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure in December
Posen, IL

Average pressure in December - Posen, IL
  • Average pressure in December: 30.1"Hg

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Posen, IL

Average wind speed in December - Posen, IL
  • Average wind speed in December: 9.5mph

The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

Average humidity in December
Posen, IL

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

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall in December
Posen, IL

Average rainfall in December - Posen, IL
  • Average rainfall in December: 1.54"

The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in December
Posen, IL

Average rainfall days in December - Posen, IL
  • Average rainfall days in December: 7.9 days

The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).

Average snowfall in December
Posen, IL

Average snowfall in December - Posen, IL
  • Average snowfall in December: 2.76"

The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Posen, IL

Average snowfall days in December - Posen, IL
  • Average snowfall days in December: 9.1 days

The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

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

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 12min).

  • Average sunshine in December: 4h and 0min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).

Average sunshine days in December
Posen, IL

Average sunshine days in December - Posen, IL
  • Average sunshine days in December: 15 days

The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).

Average UV index in December
Posen, IL

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

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

Average cloud cover in December
Posen, IL

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

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).

Average visibility in December
Posen, IL

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

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

Posen, Illinois, USA

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