December weather forecast
Chapin, IL

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Weather in December

The first month of the winter, December, is also an icy month in Chapin, Illinois, with an average temperature fluctuating between 27.7°F (-2.4°C) and 39°F (3.9°C).

Temperature

December brings a decrease in the average high-temperature, falling from November's fresh 50.5°F (10.3°C) to a cold 39°F (3.9°C). Chapin's nighttime temperature in December drops to an average of 27.7°F (-2.4°C).

Humidity

In Chapin, the average relative humidity in December is 78%.

Rainfall

The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 1.54" (39mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. In Chapin, during December, snow falls for 5 days and regularly aggregates up to 1.5" (38mm) of snow. In Chapin, during the entire year, snow falls for 28.3 days and aggregates up to 9.76" (248mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 24min of daylight.
On the first day of the month, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:22 am and sunset at 4:47 pm CST.

Sunshine

The average sunshine in December in Chapin is 4.8h.

UV index

The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the average person.
Note: The daily high UV index of 2 during December translates into the following recommendations:
Prolonged exposure to sunlight rarely troubles the majority, but constant protection is vital for babies, children, and fair-skinned people. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Updated: Jun 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

Chapin in December has an average high-temperature of 39°F (3.9°C) and an average low-temperature of 27.7°F (-2.4°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which combines relative humidity and air temperature, in August is calculated to be 89.6°F (32°C).

What is the average humidity in December?

In December, the average relative humidity is 78%.

What is the driest month in Chapin?

The month with the least rainfall is December, when the rain falls for 8.1 days and typically collects 1.54" (39mm) of precipitation.

How much does it rain in December?

In Chapin, in December, during 8.1 rainfall days, 1.54" (39mm) of precipitation is typically accumulated.

How much does it snow in December?

In Chapin, during December, snow falls for 5 days and regularly aggregates up to 1.5" (38mm) of snow.

What is the month with the shortest days in Chapin?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

What is the average length of the day in December?

In Chapin, the average day length in December is 9h and 25min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:04 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 4:47 pm CST.

How many hours of sunshine does Chapin have in December?

In Chapin, the average sunshine duration in December is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

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

Average temperature in December - Chapin, IL
  • Average high temperature in December: 39°F

The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.4°F).

  • Average low temperature in December: 27.7°F

The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).

Average pressure in December
Chapin, IL

Average pressure in December - Chapin, IL
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed in December
Chapin, IL

Average wind speed in December - Chapin, IL
  • Average wind speed in December: 9.6mph

The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).

Average humidity in December
Chapin, IL

Average humidity in December - Chapin, IL
  • Average humidity in December: 78%

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

Average rainfall in December
Chapin, IL

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

The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.54").

Average rainfall days in December
Chapin, IL

Average rainfall days in December - Chapin, IL
  • Average rainfall days in December: 8.1 days

The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and February (7.1 days).

Average snowfall in December
Chapin, IL

Average snowfall in December - Chapin, IL
  • Average snowfall in December: 1.5"

The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Chapin, IL

Average snowfall days in December - Chapin, IL
  • Average snowfall days in December: 5 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
Chapin, IL

Average daylight in December / Average sunshine in December - Chapin, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).

Average sunshine days in December
Chapin, IL

Average sunshine days in December - Chapin, IL
  • Average sunshine days in December: 18.5 days

The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.5 days).

Average UV index in December
Chapin, IL

Average UV index in December - Chapin, IL
  • Average UV index in December: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Chapin, IL

Average cloud cover in December - Chapin, IL
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).

Average visibility in December
Chapin, IL

Average visibility in December - Chapin, 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).

Chapin, Illinois, USA

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