December weather forecast
Sparta, IL

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Weather in December

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

Temperature

A change in temperatures is noted as November gives way to December, with average highs reducing from a fresh 53.6°F (12°C) to a frosty 43.5°F (6.4°C). Nighttime temperatures in December average to a subzero cold 31.1°F (-0.5°C).

Humidity

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

Rainfall

In Sparta, in December, during 6.4 rainfall days, 1.06" (27mm) of precipitation is typically accumulated. Throughout the year, there are 125.7 rainfall days, and 18.31" (465mm) of precipitation is accumulated.

Snowfall

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

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of December in Sparta, sunrise is at 6:56 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:49 pm CST.

Sunshine

The average sunshine in December in Sparta is 4.9h.

UV index

The months with the lowest UV index in Sparta are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Stay sun-safe with clothing that is both closely woven and worn loosely. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of 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 Sparta in December?

December temperatures in Sparta, Illinois, vary between a high-temperature of 43.5°F (6.4°C) and a low-temperature of 31.1°F (-0.5°C). In August, the average heat index (a.k.a. 'felt air temperature', 'apparent temperature'), which combines relative humidity and air temperature, is evaluated at 96.8°F (36°C).

What is the average humidity in December in Sparta?

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

How many days does it rain in December in Sparta?

In Sparta, in December, it is raining for 6.4 days, with typically 1.06" (27mm) of accumulated precipitation.

How much does it snow in Sparta in December?

In Sparta, during December, snow falls for 2.7 days and regularly aggregates up to 0.63" (16mm) of snow.

What is the month with the shortest days in Sparta?

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

How many hours of daylight does Sparta have in December?

The average day length in December is 9h and 34min.

When are sunrise and sunset in December in Sparta?

In December, on the first day of the month, sunrise is at 6:56 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:15 am and sunset at 4:49 pm CST.

How many hours of sunshine does Sparta have in December?

The average sunshine duration in December is 4.9h.

When is the lowest UV index in Sparta?

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

How high is the UV index in December in Sparta?

In December, the average daily maximum UV index in Sparta is 2. A UV Index value of 2, and less, symbolizes 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
Sparta, IL

Average temperature in December - Sparta, 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
Sparta, IL

Average pressure in December - Sparta, 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
Sparta, IL

Average wind speed in December - Sparta, 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
Sparta, IL

Average humidity in December - Sparta, 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
Sparta, IL

Average rainfall in December - Sparta, 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
Sparta, IL

Average rainfall days in December - Sparta, 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
Sparta, IL

Average snowfall in December - Sparta, 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
Sparta, IL

Average snowfall days in December - Sparta, 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
Sparta, IL

Average daylight in December / Average sunshine in December - Sparta, 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
Sparta, IL

Average sunshine days in December - Sparta, 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
Sparta, IL

Average UV index in December - Sparta, 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
Sparta, IL

Average cloud cover in December - Sparta, 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
Sparta, IL

Average visibility in December - Sparta, 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).

Sparta, Illinois, USA

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