December weather forecast
Grand Ridge, IL

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Weather in December

The first month of the winter, December, is also a wintry month in Grand Ridge, Illinois, with an average temperature ranging between min 25.5°F (-3.6°C) and max 35.6°F (2°C).

Temperature

Transition into December marks a drop in the average high-temperature, moving from a frosty 47.3°F (8.5°C) in November to a wintry 35.6°F (2°C). December's nights observe an average temperature of 25.5°F (-3.6°C).

Humidity

The average relative humidity in December is 82%.

Rainfall

The month with the least rainfall is December, when the rain falls for 6.9 days and typically collects 1.18" (30mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall in Grand Ridge. In Grand Ridge, in December, snow falls for 7.8 days, with typically accumulated 1.46" (37mm) of snow. In Grand Ridge, during the entire year, snow falls for 37.9 days and aggregates up to 12.91" (328mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 18min of daylight.
On the first day of the month, sunrise is at 7:02 am and sunset at 4:27 pm. On the last day of December, in Grand Ridge, sunrise is at 7:20 am and sunset at 4:36 pm CST.

Sunshine

The average sunshine in December is 4.3h.

UV index

The months with the lowest UV index in Grand Ridge are January and December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: A maximum daily UV index of 1 during December morphs into the following directions:
Infants, children, and people with sensitive skin should always have protection against lengthy periods of sun exposure. When the Sun is at its strongest around midday, find shade and limit exposure. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
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Frequently asked questions

How cold is it in Grand Ridge in December?

December temperatures vary between a high-temperature of 35.6°F (2°C) and a low-temperature of 25.5°F (-3.6°C). In July, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is computed to be 87.8°F (31°C).

What is the average humidity in December in Grand Ridge?

In Grand Ridge, the average relative humidity in December is 82%.

What is the driest month in Grand Ridge?

December is the month with the least rainfall. Rain falls for 6.9 days and accumulates 1.18" (30mm) of precipitation.

How many days does it rain in December in Grand Ridge?

In Grand Ridge, in December, during 6.9 rainfall days, 1.18" (30mm) of precipitation is typically accumulated.

How many days does it snow in December in Grand Ridge?

In Grand Ridge, in December, during 7.8 snowfall days, 1.46" (37mm) of snow is typically accumulated.

What is the month with the shortest days in Grand Ridge?

With an average of 9h and 18min of daylight, December has the shortest days of the year in Grand Ridge.

How many hours of daylight does Grand Ridge have in December?

In December, the average day length in Grand Ridge is 9h and 16min.

When are sunrise and sunset in December in Grand Ridge?

In December, on the first day of the month, sunrise is at 7:02 am and sunset at 4:27 pm. On the last day of the month, in Grand Ridge, sunrise is at 7:20 am and sunset at 4:36 pm CST.

How long on average sun shines in December in Grand Ridge?

The average sunshine duration in December in Grand Ridge, Illinois, is 4.3h.

What is the month with the lowest UV index in Grand Ridge?

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

What is the UV index intensity in December in Grand Ridge?

In Grand Ridge, Illinois, the average daily maximum UV index in December is 1. A UV Index value of 2, and less, symbolizes 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
Grand Ridge, IL

Average temperature in December - Grand Ridge, IL
  • Average high temperature in December: 35.6°F

The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (29.5°F).

  • Average low temperature in December: 25.5°F

The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).

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Average pressure in December
Grand Ridge, IL

Average pressure in December - Grand Ridge, IL
  • Average pressure in December: 30.11"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in December
Grand Ridge, IL

Average wind speed in December - Grand Ridge, IL
  • Average wind speed in December: 9.7mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity in December
Grand Ridge, IL

Average humidity in December - Grand Ridge, IL
  • Average humidity in December: 82%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in December
Grand Ridge, IL

Average rainfall in December - Grand Ridge, IL
  • Average rainfall in December: 1.18"

The wettest month (with the highest rainfall) is May (3.39").
The driest month (with the least rainfall) is December (1.18").

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Average rainfall days in December
Grand Ridge, IL

Average rainfall days in December - Grand Ridge, IL
  • Average rainfall days in December: 6.9 days

The month with the highest number of rainy days is July (18.1 days).
The month with the least rainy days is February (5.3 days).

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Average snowfall in December
Grand Ridge, IL

Average snowfall in December - Grand Ridge, IL
  • Average snowfall in December: 1.46"

The month with the highest snowfall is February (3.27").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in December
Grand Ridge, IL

Average snowfall days in December - Grand Ridge, IL
  • Average snowfall days in December: 7.8 days

The month with the highest number of snowfall days is January (11.8 days).
The 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
Grand Ridge, IL

Average daylight in December / Average sunshine in December - Grand Ridge, IL
  • Average daylight in December: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).

  • Average sunshine in December: 4h and 2min

The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).

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Average sunshine days in December
Grand Ridge, IL

Average sunshine days in December - Grand Ridge, IL
  • Average sunshine days in December: 17.9 days

The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is July (9.2 days).

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Average UV index in December
Grand Ridge, IL

Average UV index in December - Grand Ridge, IL
  • Average UV index in December: 1

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

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Average cloud cover in December
Grand Ridge, IL

Average cloud cover in December - Grand Ridge, IL
  • Average cloud cover in December: 55

The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 32).

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Average visibility in December
Grand Ridge, IL

Average visibility in December - Grand Ridge, IL
  • Average visibility in December: 6mi

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

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Grand Ridge, Illinois, USA

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