December weather forecast
Mattoon, KY

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Weather in December

December, the first month of the winter in Mattoon, is also a frosty month, with an average temperature varying between 33.4°F (0.8°C) and 45.5°F (7.5°C).

Temperature

Mattoon's December weather comes with a decrease in average high-temperatures, moving from a cool 54.5°F (12.5°C) in November to a chilly 45.5°F (7.5°C). Mattoon's average low-temperature in the month of December is recorded at a cold 33.4°F (0.8°C).

Humidity

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

Rainfall

In Mattoon, Kentucky, in December, during 10.8 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. Throughout the year, there are 148.8 rainfall days, and 27.05" (687mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, November and December. In Mattoon, during December, snow falls for 3.2 days and regularly aggregates up to 0.51" (13mm) of snow. Throughout the year, there are 15 snowfall days, and 4.8" (122mm) of snow is accumulated.

Daylight

The month with the shortest days in Mattoon is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 6:48 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 4:44 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Updated: Aug 17, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average December temperature?

The average high-temperature, in December, in Mattoon, is 45.5°F (7.5°C), while the average low-temperature is 33.4°F (0.8°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which takes the relative humidity and factors it into the air temperature reading, in August is computed to be 95°F (35°C).

What is the average humidity in December?

The average relative humidity in December is 78%.

How much does it rain in Mattoon in December?

In December, the rain falls for 10.8 days. Throughout December, 2.05" (52mm) of precipitation is accumulated.

How much does it snow in December?

In Mattoon, in December, snow falls for 3.2 days, with typically accumulated 0.51" (13mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 36min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 38min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 6:48 am and sunset at 4:34 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 4:44 pm CST.

How many hours of sunshine does Mattoon have in December?

In December, the average sunshine duration is 4.8h.

What are the months with the lowest UV index in Mattoon?

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

What is the UV index intensity in December?

In Mattoon, the average daily maximum UV index in December is 2. A UV Index reading 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
Mattoon, KY

Average temperature in December - Mattoon, KY
  • Average high temperature in December: 45.5°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (40.5°F).

  • Average low temperature in December: 33.4°F

The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (27.5°F).

Average pressure in December
Mattoon, KY

Average pressure in December - Mattoon, KY
  • 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 (29.95"Hg).

Average wind speed in December
Mattoon, KY

Average wind speed in December - Mattoon, KY
  • Average wind speed in December: 8.8mph

The windiest month (with the highest average wind speed) is February (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

Average humidity in December
Mattoon, KY

Average humidity in December - Mattoon, KY
  • Average humidity in December: 78%

The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Mattoon, KY

Average rainfall in December - Mattoon, KY
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is February (3.03").
The driest month (with the least rainfall) is September (1.3").

Average rainfall days in December
Mattoon, KY

Average rainfall days in December - Mattoon, KY
  • Average rainfall days in December: 10.8 days

The months with the highest number of rainy days are May and July (16.3 days).
The month with the least rainy days is November (8.8 days).

Average snowfall in December
Mattoon, KY

Average snowfall in December - Mattoon, KY
  • Average snowfall in December: 0.51"

The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Mattoon, KY

Average snowfall days in December - Mattoon, KY
  • Average snowfall days in December: 3.2 days

The month with the highest number of snowfall days is January (4.5 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
Mattoon, KY

Average daylight in December / Average sunshine in December - Mattoon, KY
  • 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 36min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Mattoon, KY

Average sunshine days in December - Mattoon, KY
  • Average sunshine days in December: 18.2 days

The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is July (12.1 days).

Average UV index in December
Mattoon, KY

Average UV index in December - Mattoon, KY
  • 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
Mattoon, KY

Average cloud cover in December - Mattoon, KY
  • Average cloud cover in December: 49

The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June, August and September (Cloud cover 28).

Average visibility in December
Mattoon, KY

Average visibility in December - Mattoon, KY
  • 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).

Mattoon, Kentucky, USA

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