December weather forecast
Grantsburg, IL

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Weather in December

December, the first month of the winter in Grantsburg, is still a chilly month, with an average temperature varying between 44.8°F (7.1°C) and 32.7°F (0.4°C).

Temperature

During Grantsburg's transition into December, the average high-temperature lessens, moving from a fresh 54.5°F (12.5°C) in November to a frosty 44.8°F (7.1°C). Throughout December, a steady low-temperature average of 32.7°F (0.4°C) is noted.

Humidity

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

Rainfall

In December, the rain falls for 7.3 days. Throughout December, 0.79" (20mm) of precipitation is accumulated. In Grantsburg, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.

Snowfall

Months with snowfall are January through March, November and December. In Grantsburg, in December, during 1.9 snowfall days, 0.12" (3mm) of snow is typically accumulated. In Grantsburg, during the entire year, snow falls for 11 days and aggregates up to 1.57" (40mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 36min of daylight.
On the first day of the month, sunrise is at 6:51 am and sunset at 4:37 pm. On the last day of December, sunrise is at 7:09 am and sunset at 4:47 pm CST.

Sunshine

In December, the average sunshine is 4.8h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: A maximum daily UV index of 2 during December morphs into the following directions:
Unlike children, who always need sun protection, most individuals can remain in the sun for up to an hour without getting burnt. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
Updated: Jun 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the temperature in December?

The high-temperature in Grantsburg during December is 44.8°F (7.1°C) and the low-temperature is 32.7°F (0.4°C). In September, the average heat index (a.k.a. 'real feel', 'felt air temperature'), which calculates the temperature value influenced by the moisture in the air, is estimated at 86°F (30°C).

What is the average humidity in December in Grantsburg?

In December, the average relative humidity is 78%.

How many days does it rain in December in Grantsburg?

In Grantsburg, in December, during 7.3 rainfall days, 0.79" (20mm) of precipitation is typically accumulated.

How many days does it snow in December in Grantsburg?

In Grantsburg, in December, during 1.9 snowfall days, 0.12" (3mm) of snow is typically accumulated.

What is the month with the shortest days?

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

What is the average length of the day in December?

The average day length in December in Grantsburg is 9h and 38min.

What time are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 6:51 am and sunset at 4:37 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 4:47 pm CST.

How many hours of sunshine does Grantsburg have in December?

The average sunshine duration in December in Grantsburg is 4.8h.

What is the month with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents 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
Grantsburg, IL

Average temperature in December - Grantsburg, IL
  • Average high temperature in December: 44.8°F

The warmest month (with the highest average high temperature) is July (88°F).
The month with the lowest average high temperature is January (40.1°F).

  • Average low temperature in December: 32.7°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 (27°F).

Average pressure in December
Grantsburg, IL

Average pressure in December - Grantsburg, 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 (29.94"Hg).

Average wind speed in December
Grantsburg, IL

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

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

Average humidity in December
Grantsburg, IL

Average humidity in December - Grantsburg, 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 (71%).

Average rainfall in December
Grantsburg, IL

Average rainfall in December - Grantsburg, IL
  • Average rainfall in December: 0.79"

The wettest month (with the highest rainfall) is June (1.5").
The driest month (with the least rainfall) is September (0.47").

Average rainfall days in December
Grantsburg, IL

Average rainfall days in December - Grantsburg, IL
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (13.1 days).
The months with the least rainy days are January, February and December (7.3 days).

Average snowfall in December
Grantsburg, IL

Average snowfall in December - Grantsburg, IL
  • Average snowfall in December: 0.12"

The month with the highest snowfall is February (0.67").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Grantsburg, IL

Average snowfall days in December - Grantsburg, IL
  • Average snowfall days in December: 1.9 days

The month with the highest number of snowfall days is January (3.3 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
Grantsburg, IL

Average daylight in December / Average sunshine in December - Grantsburg, IL
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).

  • Average sunshine in December: 4h and 5min

The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 36min).

Average sunshine days in December
Grantsburg, IL

Average sunshine days in December - Grantsburg, IL
  • Average sunshine days in December: 21.2 days

The month with the most sunshine days is October (21.5 days).
The month with the least sunshine days is June (14.8 days).

Average UV index in December
Grantsburg, IL

Average UV index in December - Grantsburg, 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, February and December (UV index 2).

Average cloud cover in December
Grantsburg, IL

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

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

Average visibility in December
Grantsburg, IL

Average visibility in December - Grantsburg, 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).

Grantsburg, Illinois, USA

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