December weather forecast
Coulterville, IL

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Weather in December

December, the first month of the winter in Coulterville, is still a chilly month, with an average temperature ranging between max 43.5°F (6.4°C) and min 31.1°F (-0.5°C).

Temperature

A subtle decrease in the average high-temperature marks December, falling from November's fresh 53.6°F (12°C) to a frosty 43.5°F (6.4°C). During the month of December, the temperature in Coulterville generally drops to a low average of 31.1°F (-0.5°C).

Humidity

In Coulterville, Illinois, the average relative humidity in December is 77%.

Rainfall

In Coulterville, Illinois, during December, the rain falls for 6.4 days and regularly aggregates up to 1.06" (27mm) of precipitation. Throughout the year, in Coulterville, there are 125.7 rainfall days, and 18.31" (465mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Coulterville are January through March, October through December. In Coulterville, in December, snow falls for 2.7 days, with typically accumulated 0.63" (16mm) of snow. Throughout the year, there are 14.8 snowfall days, and 3.94" (100mm) of snow is accumulated.

Daylight

The month with the shortest days in Coulterville, Illinois, is December, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 6:56 am and sunset at 4:38 pm. On the last day of December, sunrise is at 7:14 am and sunset at 4:48 pm CST.

Sunshine

In December, the average sunshine in Coulterville is 4.9h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Coulterville, Illinois. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for average individuals.
Note: The UV index of 2 in December translates into these instructions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. To guard against the harmful effects of the Sun, minimize exposure during midday. Stay sun-safe with clothing that is both closely woven and worn loosely. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
Updated: Feb 12, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold in Coulterville?

In December, the average high-temperature and low-temperature are 43.5°F (6.4°C) and 31.1°F (-0.5°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'feels like'), which combines relative humidity and air temperature, in August is computed to be 96.8°F (36°C).

What is the average humidity in December in Coulterville?

The average relative humidity in December in Coulterville, Illinois, is 77%.

How much does it rain in Coulterville in December?

In Coulterville, Illinois, during December, the rain falls for 6.4 days and regularly aggregates up to 1.06" (27mm) of precipitation.

How much does it snow in Coulterville in December?

In Coulterville, Illinois, in December, snow falls for 2.7 days, with typically accumulated 0.63" (16mm) of snow.

What is the month with the shortest days in Coulterville?

The month with the shortest days in Coulterville is December, with an average of 9h and 36min of daylight.

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

In December, the average day length is 9h and 34min.

When is the sunrise / sunset in December in Coulterville?

In December, on the first day of the month, sunrise is at 6:56 am and sunset at 4:38 pm. On the last day of the month, in Coulterville, Illinois, sunrise is at 7:14 am and sunset at 4:48 pm CST.

How long on average sun shines in December in Coulterville?

In Coulterville, Illinois, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Coulterville?

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

How high is the UV index in December in Coulterville?

The average daily maximum UV index in December in Coulterville, Illinois, is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from 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
Coulterville, IL

Average temperature in December - Coulterville, IL
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (38.8°F).

  • Average low temperature in December: 31.1°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 (25.3°F).

Average pressure in December
Coulterville, IL

Average pressure in December - Coulterville, 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 (29.93"Hg).

Average wind speed in December
Coulterville, IL

Average wind speed in December - Coulterville, IL
  • Average wind speed in December: 8.7mph

The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in December
Coulterville, IL

Average humidity in December - Coulterville, IL
  • Average humidity in December: 77%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Coulterville, IL

Average rainfall in December - Coulterville, IL
  • Average rainfall in December: 1.06"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is February (0.94").

Average rainfall days in December
Coulterville, IL

Average rainfall days in December - Coulterville, IL
  • Average rainfall days in December: 6.4 days

The month with the highest number of rainy days is July (15 days).
The month with the least rainy days is January (6.1 days).

Average snowfall in December
Coulterville, IL

Average snowfall in December - Coulterville, IL
  • Average snowfall in December: 0.63"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are April, May, June, July, August and September (0").

Average snowfall days in December
Coulterville, IL

Average snowfall days in December - Coulterville, IL
  • Average snowfall days in December: 2.7 days

The month with the highest number of snowfall days is January (4.8 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
Coulterville, IL

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

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 4h and 5min

The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in December
Coulterville, IL

Average sunshine days in December - Coulterville, IL
  • Average sunshine days in December: 21.7 days

The month with the most sunshine days is December (21.7 days).
The month with the least sunshine days is July (13 days).

Average UV index in December
Coulterville, IL

Average UV index in December - Coulterville, 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
Coulterville, IL

Average cloud cover in December - Coulterville, IL
  • Average cloud cover in December: 47

The months with the most cloud cover are January and February (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 27).

Average visibility in December
Coulterville, IL

Average visibility in December - Coulterville, 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).

Coulterville, Illinois, USA

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