Climate and monthly weather forecast
Summit, IL

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Weather in January

January, like December, is a freezing cold winter month in Summit, Illinois, with an average temperature varying between 29.5°F (-1.4°C) and 19.2°F (-7.1°C). In Summit, the month of January registers the lowest temperatures, averaging 29.5°F (-1.4°C) at the peak and 19.2°F (-7.1°C) at the lowest. Weather in January »

Weather in February

The last month of the winter, February, is a cold month in Summit, Illinois, with an average temperature ranging between max 32.4°F (0.2°C) and min 21.9°F (-5.6°C). The initiation of February records an average high-temperature of a cold 32.4°F (0.2°C), displaying a near consistency with the previous month. Weather in February »

Weather in March

March, the first month of the spring in Summit, is a frosty month, with an average temperature varying between 43.7°F (6.5°C) and 32.2°F (0.1°C). March's onset brings a rise in the average high-temperature, moving from a wintry 32.4°F (0.2°C) in February to a frosty 43.7°F (6.5°C). Weather in March »

Weather in April

April in Summit, Illinois, is a cool spring month, with temperature in the range of an average low of 40.8°F (4.9°C) and an average high of 54.1°F (12.3°C). With the onset of April, the average high-temperature slightly shifts from March's frosty 43.7°F (6.5°C) to a fresh 54.1°F (12.3°C). Weather in April »

Weather in May

May, the last month of the spring in Summit, is a comfortable month, with temperature in the range of an average high of 65.7°F (18.7°C) and an average low of 51.6°F (10.9°C). Observing a rise in May, the average high-temperature goes from April's fresh 54.1°F (12.3°C) to a comfortable 65.7°F (18.7°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Summit, Illinois, with an average temperature fluctuating between 61.5°F (16.4°C) and 75.2°F (24°C). The onset of June marks an increase in the average high-temperature, moving from a refreshing 65.7°F (18.7°C) in May to a moderately hot 75.2°F (24°C). Weather in June »

Weather in July

July, like June, in Summit, Illinois, is a moderately hot summer month, with an average temperature ranging between min 67.1°F (19.5°C) and max 80.8°F (27.1°C). July is the warmest month of the year, registering average temperatures as high as 80.8°F (27.1°C) and as low as 67.1°F (19.5°C). Throughout July, the heat index is evaluated at a hot 86°F (30°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in Summit, Illinois, with an average temperature ranging between min 66.4°F (19.1°C) and max 79.2°F (26.2°C). The transition into August reveals an average high-temperature of a still warm 79.2°F (26.2°C), mirroring a close resemblance to July. Weather in August »

Weather in September

September, the first month of the autumn in Summit, is also an agreeable month, with an average temperature fluctuating between 72.9°F (22.7°C) and 59.4°F (15.2°C). September heralds a minor drop in average high-temperature, sliding from August's warm 79.2°F (26.2°C) to a pleasant 72.9°F (22.7°C). Weather in September »

Weather in October

October, the same as September, in Summit, Illinois, is a moderate autumn month, with an average temperature varying between 60.1°F (15.6°C) and 47.8°F (8.8°C). Summit's average high-temperature decreases in October, falling from an agreeable 72.9°F (22.7°C) in September to a refreshing 60.1°F (15.6°C). Weather in October »

Weather in November

November, the last month of the autumn in Summit, is another chilly month, with an average temperature varying between 35.4°F (1.9°C) and 46°F (7.8°C). The onset of November comes with a shift in the average high-temperature, falling from a refreshing 60.1°F (15.6°C) in October to a frosty 46°F (7.8°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Summit, Illinois, with temperature in the range of an average high of 35.1°F (1.7°C) and an average low of 26.6°F (-3°C). December's arrival correlates with a reduction in the average high-temperature, down from a chilly 46°F (7.8°C) in November to a wintry 35.1°F (1.7°C). Weather in December »
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Frequently asked questions

What is the coldest time of year in Summit?

January is the month when Summit experiences its coldest temperatures, averaging a high of 29.5°F (-1.4°C) and a low of 19.2°F (-7.1°C).

What are the most humid months in Summit?

The months with the highest humidity in Summit, Illinois, are January and February, with an average relative humidity of 82%.

How many days does it rain in Summit?

Throughout the year, in Summit, there are 110.8 rainfall days, and 9.61" (244mm) of precipitation is accumulated.

When does it snow in Summit?

January through April, October through December are months with snowfall in Summit.

How many days does it snow in Summit?

Throughout the year, in Summit, there are 32.3 snowfall days, and 4.09" (104mm) of snow is accumulated.

What is the month with the least sunshine in Summit?

With an average of 3.7h of sunshine, January has the least sunshine of the year in Summit, Illinois.

What is the snowiest month in Summit?

February is the month with the most snowfall in Summit. Snow falls for 7.5 days and accumulates 1.38" (35mm) of snow.

When is Daylight Saving Time (DST) in Summit?

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 rainiest month in Summit?

The month with the most rainfall is May, when the rain falls for 13 days and typically aggregates up to 1.38" (35mm) of precipitation.

When it does not snow in Summit?

In Summit, Illinois, snow does not fall in May through September.

When are the longest days in Summit?

June has the longest days of the year in Summit, with an average of 15h and 12min of daylight.

When is the highest UV index in Summit?

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

What month is the hottest in Summit?

With average high and low temperatures of 80.8°F (27.1°C) and 67.1°F (19.5°C) respectively, July is Summit's warmest month.

What month has the most sunshine in Summit?

August has the most sunshine of the year, with an average of 10.6h of sunshine.

What is the least humid month in Summit?

October is the least humid month, with an average relative humidity of 72%.

What is the driest month in Summit?

The month with the least rainfall is December, when the rain falls for 5.5 days and typically collects 0.43" (11mm) of precipitation.

What is the month with the shortest days in Summit?

With an average of 9h and 12min of daylight, December has the shortest days of the year in Summit, Illinois.

What is the month with the lowest UV index in Summit?

With an average maximum UV index of 1, December is the month with the lowest UV index in Summit.

Average temperature
Summit, IL

Average temperature - Summit, IL

The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (29.5°F).

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (19.2°F).

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Average pressure
Summit, IL

Average pressure - Summit, IL

The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed
Summit, IL

Average wind speed - Summit, IL

The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).

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Average humidity
Summit, IL

Average humidity - Summit, IL

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).

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Average rainfall
Summit, IL

Average rainfall - Summit, IL

The wettest month (with the highest rainfall) is May (1.38").
The driest month (with the least rainfall) is December (0.43").

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Average rainfall days
Summit, IL

Average rainfall days - Summit, IL

The month with the highest number of rainy days is July (13.3 days).
The month with the least rainy days is February (4.1 days).

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Average snowfall
Summit, IL

Average snowfall - Summit, IL

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Summit, IL

Average snowfall days - Summit, IL

The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight / Average sunshine
Summit, IL

Average daylight / Average sunshine - Summit, IL

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).

The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Summit, IL

Average sunshine days - Summit, IL

The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is June (12.3 days).

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Average visibility
Summit, IL

Average visibility - Summit, 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).

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Summit, Illinois, USA

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