Climate and monthly weather forecast
Downers Grove, IL

Weather in January

January, the same as December, in Downers Grove, Illinois, is another subzero cold winter month, with an average temperature varying between 28.8°F (-1.8°C) and 17.1°F (-8.3°C). January is the coldest month, with an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 17.1°F (-8.3°C). Weather in January »

Weather in February

February, the last month of the winter in Downers Grove, is a cold month, with an average temperature fluctuating between 19.9°F (-6.7°C) and 32.5°F (0.3°C). In February, the average high-temperature is relatively the same as in January - a wintry 32.5°F (0.3°C). Weather in February »

Weather in March

March, the first month of the spring in Downers Grove, is a frosty month, with an average temperature ranging between max 45.1°F (7.3°C) and min 31.5°F (-0.3°C). In Downers Grove, the average high-temperature in March increases from a wintry 32.5°F (0.3°C) in February to a frosty 45.1°F (7.3°C). Weather in March »

Weather in April

April in Downers Grove, Illinois, is a moderate spring month, with an average temperature ranging between min 40.6°F (4.8°C) and max 56.5°F (13.6°C). In Downers Grove, the average high-temperature in April rises from a frosty 45.1°F (7.3°C) in March to a mild 56.5°F (13.6°C). Weather in April »

Weather in May

The last month of the spring, May, is a pleasant month in Downers Grove, Illinois, with an average temperature ranging between min 52.2°F (11.2°C) and max 68.9°F (20.5°C). In May, the average high-temperature rises from a moderate 56.5°F (13.6°C) in April to an agreeable 68.9°F (20.5°C). Weather in May »

Weather in June

June, the first month of the summer in Downers Grove, is a moderately hot month, with an average temperature fluctuating between 61.7°F (16.5°C) and 78.3°F (25.7°C). In June, the average high-temperature increases from an agreeable 68.9°F (20.5°C) in May to a moderately hot 78.3°F (25.7°C). Weather in June »

Weather in July

July, like June, in Downers Grove, Illinois, is a moderately hot summer month, with an average temperature ranging between min 66.4°F (19.1°C) and max 82.4°F (28°C). The warmest month is July, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C). In July, the average heat index is computed to be a tropical 89.6°F (32°C). Weather in July »

Weather in August

August, the last month of the summer in Downers Grove, is also a moderately hot month, with an average temperature varying between 64.8°F (18.2°C) and 81.1°F (27.3°C). In August, the average high-temperature is essentially the same as in July - a still moderately hot 81.1°F (27.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a warm month in Downers Grove, Illinois, with an average temperature varying between 57.9°F (14.4°C) and 74.3°F (23.5°C). In Downers Grove, the average high-temperature in September slightly decreases from 81.1°F (27.3°C) in August to a still moderately hot 74.3°F (23.5°C). Weather in September »

Weather in October

October, the same as September, in Downers Grove, Illinois, is a moderate autumn month, with an average temperature fluctuating between 45.7°F (7.6°C) and 60.6°F (15.9°C). In Downers Grove, the average high-temperature in October decreases from a warm 74.3°F (23.5°C) in September to a mild 60.6°F (15.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is another chilly month in Downers Grove, Illinois, with an average temperature fluctuating between 45.7°F (7.6°C) and 33.6°F (0.9°C). In Downers Grove, Illinois, the average high-temperature in November declines considerably from a moderate 60.6°F (15.9°C) in October to a frosty 45.7°F (7.6°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Downers Grove, Illinois, with an average temperature fluctuating between 25°F (-3.9°C) and 34.5°F (1.4°C). In December, the average high-temperature drops from a frosty 45.7°F (7.6°C) in November to a cold 34.5°F (1.4°C). Weather in December »
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FAQ

What is the coldest month in Downers Grove?

January is the coldest month in Downers Grove, with an average high-temperature of 28.8°F (-1.8°C) and an average low-temperature of 17.1°F (-8.3°C).

What is the most humid month in Downers Grove?

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

How many days does it rain in Downers Grove?

In Downers Grove, Illinois, during the entire year, the rain falls for 118.5 days and collects up to 13.74" (349mm) of precipitation.

When does it snow in Downers Grove?

January through April, October through December are months with snowfall in Downers Grove, Illinois.

How much does it snow in Downers Grove?

In Downers Grove, Illinois, during the entire year, snow falls for 34.9 days and aggregates up to 7.2" (183mm) of snow.

What is the month with the least sunshine in Downers Grove?

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

When is the lowest UV index in Downers Grove?

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

When does it snow the most in Downers Grove?

The month with the most snowfall in Downers Grove, Illinois, is February, when snow falls for 8.6 days and typically aggregates up to 2.28" (58mm) of snow.

When is Daylight Saving Time (DST) in Downers Grove?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts in Downers Grove, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from CDT to CST.

What is the wettest month in Downers Grove?

The month with the most rainfall is May, when the rain falls for 14.9 days and typically aggregates up to 1.97" (50mm) of precipitation.

When it does not snow in Downers Grove?

May through September are months without snowfall in Downers Grove, Illinois.

When are the longest days in Downers Grove?

June has the longest days of the year in Downers Grove, with an average of 15h and 10min of daylight.

What is the month with the highest UV index in Downers Grove?

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

What is the warmest month in Downers Grove?

With an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C), July is the warmest month.

What month has the most sunshine in Downers Grove?

August has the most sunshine of the year in Downers Grove, with an average of 10h of sunshine.

What is the least humid month in Downers Grove?

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

What is the driest month in Downers Grove?

December is the month with the least rainfall in Downers Grove, Illinois. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.

What is the month with the shortest days in Downers Grove?

December has the shortest days of the year in Downers Grove, Illinois, with an average of 9h and 12min of daylight.

Average temperature
Downers Grove, IL

Average temperature - Downers Grove, IL

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (28.8°F).

The month with the highest average low temperature is July (66.4°F).
The coldest month (with the lowest average low temperature) is January (17.1°F).

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Average pressure
Downers Grove, IL

Average pressure - Downers Grove, 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
Downers Grove, IL

Average wind speed - Downers Grove, IL

The windiest month (with the highest average wind speed) is January (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).

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Average humidity
Downers Grove, IL

Average humidity - Downers Grove, 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
Downers Grove, IL

Average rainfall - Downers Grove, IL

The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").

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Average rainfall days
Downers Grove, IL

Average rainfall days - Downers Grove, IL

The month with the highest number of rainy days is May (14.9 days).
The month with the least rainy days is February (4.2 days).

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Average snowfall
Downers Grove, IL

Average snowfall - Downers Grove, IL

The month with the highest snowfall is February (2.28").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days
Downers Grove, IL

Average snowfall days - Downers Grove, IL

The month with the highest number of snowfall days is January (9.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Downers Grove, IL

Average daylight / Average sunshine - Downers Grove, 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 12min).

The month with the most sunshine is August (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Downers Grove, IL

Average sunshine days - Downers Grove, IL

The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).

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Average visibility
Downers Grove, IL

Average visibility - Downers Grove, 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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