Climate and monthly weather forecast
Gillum, IL

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Climate and monthly weather forecast

Weather in January

January, like December, is a freezing cold winter month in Gillum, Illinois, with an average temperature varying between -7.3°C and -0.7°C. Gillum witnesses the coldest weather in January, with temperatures averaging a high of -0.7°C and a low of -7.3°C. Weather in January »

Weather in February

The last month of the winter, February, is an icy month in Gillum, Illinois, with an average temperature fluctuating between -5.3°C and 2°C. With the advent of February, Gillum experiences an average high-temperature of a cold 2°C, mirroring a close resemblance to the previous month. Weather in February »

Weather in March

March, the first month of the spring in Gillum, is a chilly month, with temperature in the range of an average high of 9.2°C and an average low of 1.1°C. The shift into March is accompanied by a temperature increase, with the average high-temperature rising from an icy 2°C in February to a chilly 9.2°C. Weather in March »

Weather in April

April in Gillum, Illinois, is a mild spring month, with an average temperature fluctuating between 15.8°C and 6.8°C. An escalation in the average high-temperature is seen with the onset of April, moving from a chilly 9.2°C in March to a refreshing 15.8°C. Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Gillum, Illinois, with an average temperature varying between 22.2°C and 13°C. An escalation in the average high-temperature is seen with the onset of May, moving from a moderate 15.8°C in April to an agreeable 22.2°C. Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Gillum, Illinois, with an average temperature fluctuating between 26.3°C and 17.3°C. June brings a slight rise in Gillum's average high-temperature, moving from an agreeable 22.2°C in May to a warm 26.3°C. Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Gillum, Illinois, with an average temperature ranging between min 18.3°C and max 27.1°C. July, with its average high-temperature of 27.1°C and an average low-temperature of 18.3°C, holds the record as the warmest month. The heat index in July is evaluated at a tropical 31°C. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Gillum, Illinois, with an average temperature ranging between min 17.3°C and max 26.6°C. The beginning of August records an average high-temperature of a still warm 26.6°C, almost echoing the conditions of the previous month. Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Gillum, Illinois, with an average temperature fluctuating between 14.1°C and 24.2°C. The advent of September observes an average high-temperature of a still moderately hot 24.2°C, nearly identical to August's 26.6°C. Weather in September »

Weather in October

October, the same as September, is another enjoyable autumn month in Gillum, Illinois, with temperature in the range of an average low of 8.1°C and an average high of 16.7°C. October's arrival coincides with a drop in the average high-temperature, decreasing from September's moderately hot 24.2°C to a refreshing 16.7°C. Weather in October »

Weather in November

November, the last month of the autumn in Gillum, is also a frosty month, with an average temperature varying between 8.7°C and 1.5°C. In Gillum, stepping into November signifies a significant temperature decrement, moving down from October's enjoyable 16.7°C to a chilly 8.7°C. Weather in November »

Weather in December

December, the first month of the winter in Gillum, is still a cold month, with an average temperature fluctuating between 2.5°C and -3.3°C. The transition into December is accompanied by a temperature decrease, with the average high-temperature shifting from a chilly 8.7°C in November to a cold 2.5°C. Weather in December »
Updated: Aug 18, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?
In Gillum, the lowest temperatures are generally noted in January, averaging a high of -0.7°C and a low of -7.3°C.
How much does it rain?
In Gillum, during the entire year, the rain falls for 163.1 days and collects up to 854mm of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 12.8 days and typically aggregates up to 128mm of snow.
How many days does it snow?
In Gillum, during the entire year, snow falls for 40.7 days and aggregates up to 432mm of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.7h of sunshine.
What is the month with the lowest UV index?
The months with the lowest UV index are January, February, October through December, with an average maximum UV index of 2.
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.
What is the wettest month?
The month with the most rainfall is May, when the rain falls for 20.1 days and typically aggregates up to 116mm of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
The month with the longest days is June, with an average of 15h and 0min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 9.8h of sunshine.
What are the months with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What are the warmest months?
Gillum's temperatures peak on average in July, reaching 27.1°C at their highest and 18.3°C at their lowest.
What is the most humid month?
With an average relative humidity of 86%, July is the most humid month.
What is the least humid month?
The least humid month is October, with an average relative humidity of 71%.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 9 days and typically collects 49mm of precipitation.
What is the month with the shortest days?
With an average of 9h and 18min of daylight, December has the shortest days of the year.
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Average temperature
Gillum, IL

The warmest month (with the highest average high temperature) is July (27.1°C).
The month with the lowest average high temperature is January (-0.7°C).

The month with the highest average low temperature is July (18.3°C).
The coldest month (with the lowest average low temperature) is January (-7.3°C).

Average pressure
Gillum, IL

The month with the highest atmospheric pressure is January (1020.6mbar).
The month with the lowest atmospheric pressure is June (1013.1mbar).

Average wind speed
Gillum, IL

The windiest month (with the highest average wind speed) is January (17.9km/h).
The calmest month (with the lowest average wind speed) is August (10.6km/h).

Average humidity
Gillum, IL

The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is October (71%).

Average rainfall
Gillum, IL

The wettest month (with the highest rainfall) is May (116mm).
The driest month (with the least rainfall) is December (49mm).

Average rainfall days
Gillum, IL

The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is February (6.9 days).

Average snowfall
Gillum, IL

The month with the highest snowfall is January (128mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days
Gillum, IL

The month with the highest number of snowfall days is January (12.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Gillum, IL

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).

The month with the most sunshine is June (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days
Gillum, IL

The month with the most sunshine days is November (17.4 days).
The month with the least sunshine days is May (8.4 days).

Average UV index
Gillum, IL

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).

Average cloud cover
Gillum, IL

The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 33).

Average visibility
Gillum, IL

The months with the highest visibility are February, March, April, May, June, September, October, November and December (9km).
The months with the lowest visibility are January, July and August (8km).

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