December weather forecast and climate
Scales Mound, IL

Weather in December

December, the first month of the winter, in Scales Mound, is also a subzero cold month, with temperature in the range of an average low of 21.4°F (-5.9°C) and an average high of 31.8°F (-0.1°C).

Temperature

In December, the average high-temperature decreases, from a frosty 44.2°F (6.8°C) in November, to a subzero cold 31.8°F (-0.1°C). In Scales Mound, the average low-temperature is 21.4°F (-5.9°C).

Humidity

The average relative humidity in Scales Mound is 83%.

Rainfall

In Scales Mound, Illinois,, during 7.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 153.1 rainfall days, and 30.75" (781mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Scales Mound are January through April, October through December. In Scales Mound, during 10.5 snowfall days, 3.03" (77mm) of snow is typically accumulated. Throughout the year, in Scales Mound, Illinois, there are 46.9 snowfall days, and 17.52" (445mm) of snow is accumulated.

Daylight

With an average of 9.1h of daylight, December has the shortest days of the year in Scales Mound.

Sunshine

In Scales Mound, the average sunshine is 4.1h.

UV index

Months with the lowest UV index in Scales Mound are January and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from the exposure to the Sun's UV rays for ordinary individuals.
Note: In December, the average maximum UV index of 1 translate into the following recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in December in Scales Mound?

In Scales Mound, Illinois, the average relative humidity in December is 83%.

How many days does it rain in December in Scales Mound?

In Scales Mound, in December, during 7.6 rainfall days, 1.5" (38mm) of precipitation is typically accumulated.

How many days does it snow in December in Scales Mound?

In Scales Mound, Illinois, in December, during 10.5 snowfall days, 3.03" (77mm) of snow is typically accumulated.

What is the month with the shortest days in Scales Mound?

December has the shortest days of the year in Scales Mound, with an average of 9.1h of daylight.

How many hours of daylight does Scales Mound have in December?

In December, the average length of the day is 9.1h.

How many hours of sunshine does Scales Mound have in December?

The average sunshine in December is 4.1h.

When is the lowest UV index in Scales Mound?

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

What is the UV index intensity in December in Scales Mound?

In Scales Mound, Illinois, the average daily maximum UV index in December is 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to the Sun's UV rays.

Average temperature in December
Scales Mound, IL

Average temperature in December - Scales Mound, IL
  • Average high temperature in December: 31.8°F

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (25°F).

  • Average low temperature in December: 21.4°F

The month with the highest average low temperature is July (63°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

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Average pressure in December
Scales Mound, IL

Average pressure in December - Scales Mound, IL
  • Average pressure in December: 30.1"

The month with the highest atmospheric pressure is January (30.12").
The month with the lowest atmospheric pressure is June (29.9").

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Average wind speed in December
Scales Mound, IL

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

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).

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Average humidity in December
Scales Mound, IL

Average humidity in December - Scales Mound, IL
  • Average humidity in December: 83%

The month with the highest relative humidity is January (87%).
Months with the lowest relative humidity are April and October (76%).

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Average rainfall in December
Scales Mound, IL

Average rainfall in December - Scales Mound, IL
  • Average rainfall in December: 1.5"

The wettest month (with the highest rainfall) is June (4.29").
The driest month (with the least rainfall) is January (1.26").

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Average rainfall days in December
Scales Mound, IL

Average rainfall days in December - Scales Mound, IL
  • Average rainfall days in December: 7.6 days

The month with the highest number of rainy days is May (20 days).
The month with the least rainy days is February (4.8 days).

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Average snowfall in December
Scales Mound, IL

Average snowfall in December - Scales Mound, IL
  • Average snowfall in December: 3.03"

The month with the highest snowfall is January (5.12").
Months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Scales Mound, IL

Average snowfall days in December - Scales Mound, IL
  • Average snowfall days in December: 10.5 days

The month with the highest number of snowfall days is January (13.2 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
Scales Mound, IL

Average daylight in December / Average sunshine in December - Scales Mound, IL
  • Average daylight in December: 9.1h

The month with the longest days is June (Average daylight: 15.3h).
The month with the shortest days is December (Average daylight: 9.1h).

  • Average sunshine in December: 4.1h

The month with the most sunshine is August (Average sunshine: 9.8h).
The month with the least sunshine is January (Average sunshine: 3.7h).

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Average sunshine days in December
Scales Mound, IL

Average sunshine days in December - Scales Mound, IL
  • Average sunshine days in December: 15.7 days

The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is June (7.9 days).

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Average UV index in December
Scales Mound, IL

Average UV index in December - Scales Mound, IL
  • Average UV index in December: 1

Months with the highest UV index are June and July (UV index 6).
Months with the lowest UV index are January and December (UV index 1).

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Average cloud cover in December
Scales Mound, IL

Average cloud cover in December - Scales Mound, IL
  • Average cloud cover in December: 58

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 32).

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Average visibility in December
Scales Mound, IL

Average visibility in December - Scales Mound, IL
  • Average visibility in December: 6mi

Months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February and July (5mi).

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