Climate and monthly weather forecast
Grantsburg, IL

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Weather in January

January, like December, in Grantsburg, Illinois, is a wintry winter month, with an average temperature ranging between min 27°F (-2.8°C) and max 40.1°F (4.5°C). In Grantsburg, the month of January registers the lowest temperatures, averaging 40.1°F (4.5°C) at the peak and 27°F (-2.8°C) at the lowest. Weather in January »

Weather in February

The last month of the winter, February, is a frosty month in Grantsburg, Illinois, with an average temperature varying between 45.1°F (7.3°C) and 30.7°F (-0.7°C). February's onset brings an average high-temperature of a chilly 45.1°F (7.3°C), showing a minute difference from January's 40.1°F (4.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a refreshing month in Grantsburg, Illinois, with an average temperature fluctuating between 39.7°F (4.3°C) and 55.8°F (13.2°C). With the beginning of March, Grantsburg's average high-temperature sees an increase, transitioning from a frosty 45.1°F (7.3°C) in February to a mild 55.8°F (13.2°C). Weather in March »

Weather in April

April is a comfortable spring month in Grantsburg, Illinois, with an average temperature varying between 66.6°F (19.2°C) and 48.9°F (9.4°C). Grantsburg in April experiences an increase in the average high-temperature, moving from March's moderate 55.8°F (13.2°C) to an enjoyable 66.6°F (19.2°C). Weather in April »

Weather in May

The last month of the spring, May, is a warm month in Grantsburg, Illinois, with an average temperature ranging between max 75.7°F (24.3°C) and min 57.9°F (14.4°C). May's onset witnesses a shift in the average high-temperature, moving from a comfortable 66.6°F (19.2°C) in April to a warm 75.7°F (24.3°C). Weather in May »

Weather in June

June, the first month of the summer in Grantsburg, is still a warm month, with an average temperature fluctuating between 85.6°F (29.8°C) and 66.2°F (19°C). As May gives way to June, the average high-temperature displays an increase, moving from 75.7°F (24.3°C) to a still moderately hot 85.6°F (29.8°C). Weather in June »

Weather in July

July in Grantsburg, Illinois, is a hot summer month, with temperature in the range of an average high of 88°F (31.1°C) and an average low of 68.5°F (20.3°C). Grantsburg records the warmest temperatures in July, averaging a high of 88°F (31.1°C) and a low of 68.5°F (20.3°C). In July, the heat index is estimated at an extremely hot 104°F (40°C). Weather in July »

Weather in August

The last month of the summer, August, is another tropical month in Grantsburg, Illinois, with an average temperature fluctuating between 86.5°F (30.3°C) and 66.7°F (19.3°C). August's advent presents an average high-temperature of a still hot 86.5°F (30.3°C), indicating a slight variation from the conditions of the previous month. Weather in August »

Weather in September

September, the first month of the autumn in Grantsburg, is still a warm month, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 60.6°F (15.9°C). The move into September indicates a slight reduction in the average high-temperature, down from August's tropical 86.5°F (30.3°C) to a moderately hot 81.1°F (27.3°C). Weather in September »

Weather in October

October, the same as September, is another refreshing autumn month in Grantsburg, Illinois, with an average temperature varying between 49.6°F (9.8°C) and 67.8°F (19.9°C). October shows a mild decline in the average high-temperature, falling from September's moderately hot 81.1°F (27.3°C) to a comfortable 67.8°F (19.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Grantsburg, Illinois, with an average temperature fluctuating between 38.8°F (3.8°C) and 54.5°F (12.5°C). As October shifts into November, a slight alteration in temperatures is observed, with average highs reducing from an enjoyable 67.8°F (19.9°C) to a cool 54.5°F (12.5°C). Weather in November »

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). 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). Weather in December »
Updated: Jun 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What month is the coldest?

Grantsburg witnesses the coldest weather in January, with temperatures averaging a high of 40.1°F (4.5°C) and a low of 27°F (-2.8°C).

How many days does it rain?

In Grantsburg, during the entire year, the rain falls for 118.3 days and collects up to 13.03" (331mm) of precipitation.

When does it snow?

January through March, November and December are months with snowfall.

How much does it snow?

In Grantsburg, Illinois, during the entire year, snow falls for 11 days and aggregates up to 1.57" (40mm) of snow.

What are the months with the least sunshine?

January and February, with an average of 4.6h of sunshine, are months with the least sunshine in Grantsburg.

What is the month with the lowest UV index?

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

What is the snowiest month?

The month with the most snowfall is February, when snow falls for 3.2 days and typically aggregates up to 0.67" (17mm) of snow.

What is the most humid month in Grantsburg?

The months with the highest humidity are March and May, with an average relative humidity of 79%.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from CDT to CST.

When it does not snow?

In Grantsburg, Illinois, snow does not fall in April through October.

When is the highest UV index?

The months with the highest UV index are May through August, with an average maximum UV index of 6.

What is the wettest month?

The month with the most rainfall is June, when the rain falls for 12.5 days and typically aggregates up to 1.5" (38mm) of precipitation.

When are the longest days?

June has the longest days of the year in Grantsburg, Illinois, with an average of 14h and 42min of daylight.

What are the months with the most sunshine?

June and July, with an average of 10.4h of sunshine, are months with the most sunshine.

What are the warmest months in Grantsburg?

With average high temperatures of 88°F (31.1°C) and lows of 68.5°F (20.3°C), July is the warmest month.

What is the driest month?

September is the month with the least rainfall. Rain falls for 8.3 days and accumulates 0.47" (12mm) of precipitation.

What is the least humid month?

October is the least humid month, with an average relative humidity of 71%.

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 in Grantsburg.

Average temperature
Grantsburg, IL

Average temperature - Grantsburg, IL

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).

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
Grantsburg, IL

Average pressure - Grantsburg, IL

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
Grantsburg, IL

Average wind speed - Grantsburg, IL

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
Grantsburg, IL

Average humidity - Grantsburg, IL

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

Average rainfall
Grantsburg, IL

Average rainfall - Grantsburg, IL

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
Grantsburg, IL

Average rainfall days - Grantsburg, IL

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
Grantsburg, IL

Average snowfall - Grantsburg, IL

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
Grantsburg, IL

Average snowfall days - Grantsburg, IL

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 / Average sunshine
Grantsburg, IL

Average daylight / Average sunshine - Grantsburg, IL

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).

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
Grantsburg, IL

Average sunshine days - Grantsburg, IL

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
Grantsburg, IL

Average UV index - Grantsburg, IL

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 visibility
Grantsburg, IL

Average visibility - Grantsburg, IL

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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