Climate and monthly weather forecast
Wheaton, IL

Weather in January

January, the same as December, in Wheaton, Illinois, is another subzero cold winter month, with an average temperature varying between 16.7°F (-8.5°C) and 28°F (-2.2°C). January is the coldest month, with an average high-temperature of 28°F (-2.2°C) and an average low-temperature of 16.7°F (-8.5°C). Weather in January »

Weather in February

The last month of the winter, February, is a wintry month in Wheaton, Illinois, with an average temperature varying between 32.2°F (0.1°C) and 19.8°F (-6.8°C). In Wheaton, the average high-temperature in February is essentially the same as in January - a cold 32.2°F (0.1°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Wheaton, Illinois, with an average temperature fluctuating between 45°F (7.2°C) and 30.7°F (-0.7°C). In Wheaton, the average high-temperature in March increases from a wintry 32.2°F (0.1°C) in February to a frosty 45°F (7.2°C). Weather in March »

Weather in April

April is a mild spring month in Wheaton, Illinois, with an average temperature ranging between max 56.3°F (13.5°C) and min 40.3°F (4.6°C). In Wheaton, Illinois, the average high-temperature in April rises from a frosty 45°F (7.2°C) in March to a moderate 56.3°F (13.5°C). Weather in April »

Weather in May

May, the last month of the spring in Wheaton, is a pleasant month, with temperature in the range of an average high of 68.5°F (20.3°C) and an average low of 51.8°F (11°C). In May, the average high-temperature rises from a mild 56.3°F (13.5°C) in April to an agreeable 68.5°F (20.3°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Wheaton, Illinois, with an average temperature ranging between max 78.1°F (25.6°C) and min 60.8°F (16°C). In June, the average high-temperature rises from an agreeable 68.5°F (20.3°C) in May to a moderately hot 78.1°F (25.6°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Wheaton, Illinois, with an average temperature ranging between max 81.7°F (27.6°C) and min 65.3°F (18.5°C). The warmest month is July, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 65.3°F (18.5°C). The average heat index in July is evaluated at a tropical 87.8°F (31°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Wheaton, Illinois, with an average temperature fluctuating between 80.4°F (26.9°C) and 64°F (17.8°C). In Wheaton, the average high-temperature in August is practically the same as in July - a still moderately hot 80.4°F (26.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Wheaton, Illinois, with temperature in the range of an average low of 57.4°F (14.1°C) and an average high of 73.6°F (23.1°C). In Wheaton, the average high-temperature in September slightly decreases from a warm 80.4°F (26.9°C) in August to a still moderately hot 73.6°F (23.1°C). Weather in September »

Weather in October

October, the same as September, in Wheaton, Illinois, is a moderate autumn month, with temperature in the range of an average low of 45.5°F (7.5°C) and an average high of 60.4°F (15.8°C). In Wheaton, the average high-temperature in October drops from a moderately hot 73.6°F (23.1°C) in September to a moderate 60.4°F (15.8°C). Weather in October »

Weather in November

November, the last month of the autumn in Wheaton, is also a frosty month, with an average temperature fluctuating between 33.3°F (0.7°C) and 45.5°F (7.5°C). In November, the average high-temperature declines considerably from a mild 60.4°F (15.8°C) in October to a chilly 45.5°F (7.5°C). Weather in November »

Weather in December

December, the first month of the winter in Wheaton, is also a wintry month, with an average temperature ranging between max 34.3°F (1.3°C) and min 24.3°F (-4.3°C). In December, the average high-temperature decreases from a frosty 45.5°F (7.5°C) in November to a cold 34.3°F (1.3°C). Weather in December »
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FAQ

What is the coldest month in Wheaton?

The coldest month in Wheaton is January, with an average high-temperature of 28°F (-2.2°C) and an average low-temperature of 16.7°F (-8.5°C).

What is the most humid month in Wheaton?

The months with the highest humidity in Wheaton are January and February, with an average relative humidity of 83%.

How many days does it rain in Wheaton?

In Wheaton, during the entire year, the rain falls for 164.3 days and collects up to 33.78" (858mm) of precipitation.

When does it snow in Wheaton?

January through May, October through December are months with snowfall.

When does it snow the most in Wheaton?

The month with the most snowfall is January, when snow falls for 13.1 days and typically aggregates up to 5.87" (149mm) of snow.

How much does it snow in Wheaton?

Throughout the year, there are 47 snowfall days, and 20.2" (513mm) of snow is accumulated.

What is the month with the least sunshine in Wheaton?

The month with the least sunshine is January, with an average of 3.7h of sunshine.

When is the lowest UV index in Wheaton?

January is the month with the lowest UV index, with an average maximum UV index of 1.

When is Daylight Saving Time (DST) in Wheaton?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.

What is the rainiest month in Wheaton?

The month with the most rainfall in Wheaton, Illinois, is May, when the rain falls for 19.2 days and typically aggregates up to 4.45" (113mm) of precipitation.

When it does not snow in Wheaton?

June through September are months without snowfall in Wheaton, Illinois.

When are the longest days in Wheaton?

The month with the longest days in Wheaton is June, with an average of 15h and 10min of daylight.

What are the months with the highest UV index in Wheaton?

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

What is the warmest month in Wheaton?

The warmest month is July, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 65.3°F (18.5°C).

What month has the most sunshine in Wheaton?

With an average of 9.9h of sunshine, August has the most sunshine of the year in Wheaton, Illinois.

What is the least humid month in Wheaton?

The least humid month in Wheaton, Illinois, is October, with an average relative humidity of 73%.

What is the driest month in Wheaton?

November and December are months with the least rain in Wheaton, Illinois, when the rain falls for 10.2 days and typically aggregates up to 1.65" (42mm) of rain.

What is the month with the shortest days in Wheaton?

The month with the shortest days in Wheaton, Illinois, is December, with an average of 9h and 11min of daylight.

Average pressure
Wheaton, IL

Average pressure - Wheaton, 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
Wheaton, IL

Average wind speed - Wheaton, IL

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).

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Average humidity
Wheaton, IL

Average humidity - Wheaton, IL

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).

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Average rainfall
Wheaton, IL

Average rainfall - Wheaton, IL

The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").

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Average rainfall days
Wheaton, IL

Average rainfall days - Wheaton, IL

The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).

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Average snowfall
Wheaton, IL

Average snowfall - Wheaton, IL

The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Wheaton, IL

Average snowfall days - Wheaton, IL

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Wheaton, IL

Average daylight / Average sunshine - Wheaton, IL

The month with the longest days is June (Average daylight: 15h and 10min).
The month with the shortest days is December (Average daylight: 9h and 11min).

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Wheaton, IL

Average sunshine days - Wheaton, IL

The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).

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Average visibility
Wheaton, IL

Average visibility - Wheaton, IL

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

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