December weather forecast
Marion, IL

Weather in December

December, the first month of the winter, in Marion, is also a frosty month, with temperature in the range of an average low of 31.8°F (-0.1°C) and an average high of 43.9°F (6.6°C).

Temperature

In Marion, the average high-temperature in December decreases, from a cool 53.8°F (12.1°C) in November, to a frosty 43.9°F (6.6°C). In Marion, in December, the average low-temperature is 31.8°F (-0.1°C).

Humidity

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

Rainfall

In Marion, during December, the rain falls for 9.1 days and regularly aggregates up to 1.46" (37mm) of precipitation. Throughout the year, there are 137.6 rainfall days, and 23.03" (585mm) of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. In December, it is snowing for 2.7 days. Throughout December, 0.91" (23mm) of snow is accumulated. In Marion, during the entire year, snow falls for 14.5 days, and aggregates up to 4.13" (105mm) of snow.

Daylight

With an average of 9.6h of daylight, December has the shortest days of the year.

Sunshine

The average sunshine in December is 4.7h.

UV index

Months with the lowest UV index in Marion are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
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. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the average humidity in December in Marion?

In December, the average relative humidity is 78%.

How many days does it rain in December in Marion?

In Marion, Illinois, during December, the rain falls for 9.1 days and regularly aggregates up to 1.46" (37mm) of precipitation.

How many days does it snow in December in Marion?

In Marion, Illinois, in December, during 2.7 snowfall days, 0.91" (23mm) of snow is typically accumulated.

What is the month with the shortest days in Marion?

The month with the shortest days in Marion, Illinois, is December, with an average of 9.6h of daylight.

How many hours of daylight does Marion have in December?

In December, the average length of the day in Marion, Illinois, is 9.6h.

How long on average sun shines in December in Marion?

The average sunshine in December in Marion, Illinois, is 4.7h.

When is the lowest UV index in Marion?

Months with the lowest UV index in Marion, Illinois, are January, February and December, with an average maximum UV index of 2.

How high is the UV index in December in Marion?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a low health risk from the exposure to the Sun's UV radiation.

Average temperature in December
Marion, IL

Average temperature in December - Marion, IL
  • Average high temperature in December: 43.9°F

The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).

  • Average low temperature in December: 31.8°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 (26.1°F).

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Average pressure in December
Marion, IL

Average pressure in December - Marion, IL
  • Average pressure in December: 30.14"

The month with the highest atmospheric pressure is January (30.16").
The month with the lowest atmospheric pressure is June (29.94").

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Average wind speed in December
Marion, IL

Average wind speed in December - Marion, IL
  • Average wind speed in December: 8.8mph

The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

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Average humidity in December
Marion, IL

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

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

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Average rainfall in December
Marion, IL

Average rainfall in December - Marion, IL
  • Average rainfall in December: 1.46"

The wettest month (with the highest rainfall) is April (3.11").
The driest month (with the least rainfall) is September (1.1").

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Average rainfall days in December
Marion, IL

Average rainfall days in December - Marion, IL
  • Average rainfall days in December: 9.1 days

The month with the highest number of rainy days is July (15.3 days).
The month with the least rainy days is November (7.8 days).

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Average snowfall in December
Marion, IL

Average snowfall in December - Marion, IL
  • Average snowfall in December: 0.91"

Months with the highest snowfall are January and February (0.94").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Marion, IL

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

The month with the highest number of snowfall days is February (4.3 days).
Months with the least snowfall days are May, June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Marion, IL
  • Average daylight in December: 9.6h

The month with the longest days is June (Average daylight: 14.7h).
The month with the shortest days is December (Average daylight: 9.6h).

  • Average sunshine in December: 4.7h

Months with the most sunshine are June and July (Average sunshine: 10.5h).
The month with the least sunshine is January (Average sunshine: 4.6h).

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Average sunshine days in December
Marion, IL

Average sunshine days in December - Marion, IL
  • Average sunshine days in December: 18.6 days

The month with the most sunshine days is October (20.6 days).
The month with the least sunshine days is July (12.9 days).

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Average UV index in December
Marion, IL

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

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

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Average cloud cover in December
Marion, IL

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

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

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Average visibility in December
Marion, IL

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

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

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