December weather forecast
Shady Grove, IL

Weather in December

December, the first month of the winter in Shady Grove, is still a chilly month, with temperature in the range of an average high of 46.2°F (7.9°C) and an average low of 34.2°F (1.2°C).

Temperature

In December, the average high-temperature decreases from a moderate 55.6°F (13.1°C) in November to a frosty 46.2°F (7.9°C). In Shady Grove, the average low-temperature is 34.2°F (1.2°C).

Humidity

In December, the average relative humidity in Shady Grove, Illinois, is 78%.

Rainfall

In December, in Shady Grove, the rain falls for 9 days. Throughout December, 1.14" (29mm) of precipitation is accumulated. Throughout the year, there are 126.4 rainfall days, and 16.89" (429mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In Shady Grove, snow falls for 1.4 days, with typically accumulated 0.08" (2mm) of snow. Throughout the year, in Shady Grove, there are 8.9 snowfall days, and 1.65" (42mm) of snow is accumulated.

Daylight

With an average of 9h and 40min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 6:49 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:46 pm CST.

Sunshine

In December, the average sunshine is 4.9h.

UV index

The months with the lowest UV index in Shady Grove are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The average daily UV index of 2 in December transform into the following instructions:
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. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. 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 temperature in December in Shady Grove?

In Shady Grove, in December, the average high-temperature is 46.2°F (7.9°C), and the average low-temperature is 34.2°F (1.2°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, in September is evaluated at 86°F (30°C).

What is the average humidity in December in Shady Grove?

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

How much does it rain in Shady Grove in December?

In Shady Grove, during December, the rain falls for 9 days and regularly aggregates up to 1.14" (29mm) of precipitation.

How many days does it snow in December in Shady Grove?

In Shady Grove, Illinois, during December, snow falls for 1.4 days and regularly aggregates up to 0.08" (2mm) of snow.

What is the month with the shortest days in Shady Grove?

December has the shortest days of the year in Shady Grove, Illinois, with an average of 9h and 40min of daylight.

What is the average length of the day in December in Shady Grove?

In Shady Grove, Illinois, the average day length in December is 9h and 40min.

When are sunrise and sunset in December in Shady Grove?

In December, on the first day of the month, sunrise is at 6:49 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:07 am and sunset at 4:46 pm CST.

How many hours of sunshine does Shady Grove have in December?

In Shady Grove, the average sunshine duration in December is 4.9h.

When is the lowest UV index in Shady Grove?

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

What is the UV index reading in December in Shady Grove?

In December, the average daily maximum UV index in Shady Grove is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Shady Grove, IL

Average temperature in December - Shady Grove, IL
  • Average high temperature in December: 46.2°F

The warmest month (with the highest average high temperature) is July (88.7°F).
The month with the lowest average high temperature is January (41.5°F).

  • Average low temperature in December: 34.2°F

The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (28.6°F).

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Average pressure in December
Shady Grove, IL

Average pressure in December - Shady Grove, IL
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).

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Average wind speed in December
Shady Grove, IL

Average wind speed in December - Shady Grove, IL
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is April (9mph).
The calmest months (with the lowest average wind speed) are July and August (5.7mph).

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Average humidity in December
Shady Grove, IL

Average humidity in December - Shady Grove, IL
  • Average humidity in December: 78%

The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in December
Shady Grove, IL

Average rainfall in December - Shady Grove, IL
  • Average rainfall in December: 1.14"

The wettest month (with the highest rainfall) is May (1.93").
The driest month (with the least rainfall) is September (0.63").

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Average rainfall days in December
Shady Grove, IL

Average rainfall days in December - Shady Grove, IL
  • Average rainfall days in December: 9 days

The month with the highest number of rainy days is May (14.7 days).
The month with the least rainy days is October (7.6 days).

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Average snowfall in December
Shady Grove, IL

Average snowfall in December - Shady Grove, IL
  • Average snowfall in December: 0.08"

The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Shady Grove, IL

Average snowfall days in December - Shady Grove, IL
  • Average snowfall days in December: 1.4 days

The month with the highest number of snowfall days is February (3.3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average daylight in December /
Average sunshine in December
Shady Grove, IL

Average daylight in December / Average sunshine in December - Shady Grove, IL
  • Average daylight in December: 9h and 40min

The month with the longest days is June (Average daylight: 14h and 40min).
The month with the shortest days is December (Average daylight: 9h and 40min).

  • Average sunshine in December: 4h and 54min

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

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Average sunshine days in December
Shady Grove, IL

Average sunshine days in December - Shady Grove, IL
  • Average sunshine days in December: 20 days

The month with the most sunshine days is October (22.3 days).
The month with the least sunshine days is July (14.2 days).

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Average UV index in December
Shady Grove, IL

Average UV index in December - Shady Grove, IL
  • 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 and December (UV index 2).

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Average cloud cover in December
Shady Grove, IL

Average cloud cover in December - Shady Grove, IL
  • Average cloud cover in December: 49

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

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Average visibility in December
Shady Grove, IL

Average visibility in December - Shady Grove, 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).

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