Climate and monthly weather forecast
Prospect Heights, IL

Weather in January

January, like December, is another subzero cold winter month in Prospect Heights, Illinois, with an average temperature fluctuating between 28.2°F (-2.1°C) and 18°F (-7.8°C). The coldest month is January, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C). Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Prospect Heights, Illinois, with an average temperature fluctuating between 20.5°F (-6.4°C) and 31.6°F (-0.2°C). In Prospect Heights, Illinois, the average high-temperature in February is essentially the same as in January - a still subzero cold 31.6°F (-0.2°C). Weather in February »

Weather in March

March, the first month of the spring in Prospect Heights, is a chilly month, with an average temperature varying between 30.9°F (-0.6°C) and 43.5°F (6.4°C). In Prospect Heights, Illinois, the average high-temperature in March rises from a subzero cold 31.6°F (-0.2°C) in February to a chilly 43.5°F (6.4°C). Weather in March »

Weather in April

April in Prospect Heights, Illinois, is a fresh spring month, with an average temperature varying between 54.3°F (12.4°C) and 40.1°F (4.5°C). In April, the average high-temperature rises from a chilly 43.5°F (6.4°C) in March to a fresh 54.3°F (12.4°C). Weather in April »

Weather in May

May, the last month of the spring in Prospect Heights, is an enjoyable month, with an average temperature ranging between min 50.5°F (10.3°C) and max 65.8°F (18.8°C). In Prospect Heights, the average high-temperature in May rises from a fresh 54.3°F (12.4°C) in April to a comfortable 65.8°F (18.8°C). Weather in May »

Weather in June

June, the first month of the summer in Prospect Heights, is a warm month, with an average temperature fluctuating between 75.9°F (24.4°C) and 60.4°F (15.8°C). In June, the average high-temperature rises from a comfortable 65.8°F (18.8°C) in May to a warm 75.9°F (24.4°C). Weather in June »

Weather in July

July, the same as June, is another warm summer month in Prospect Heights, Illinois, with an average temperature ranging between min 66.4°F (19.1°C) and max 81.1°F (27.3°C). The warmest month is July, with an average high-temperature of 81.1°F (27.3°C) and an average low-temperature of 66.4°F (19.1°C). In July, the average heat index is calculated to be a tropical 86°F (30°C). Weather in July »

Weather in August

August, the last month of the summer in Prospect Heights, is also a moderately hot month, with temperature in the range of an average high of 79.7°F (26.5°C) and an average low of 65.5°F (18.6°C). In August, the average high-temperature is practically the same as in July - a still moderately hot 79.7°F (26.5°C). Weather in August »

Weather in September

September, the first month of the autumn in Prospect Heights, is still a pleasant month, with an average temperature varying between 73.2°F (22.9°C) and 58.8°F (14.9°C). In September, the average high-temperature slightly decreases from a warm 79.7°F (26.5°C) in August to a pleasant 73.2°F (22.9°C). Weather in September »

Weather in October

October, the same as September, in Prospect Heights, Illinois, is a moderate autumn month, with an average temperature fluctuating between 46.4°F (8°C) and 59.9°F (15.5°C). In Prospect Heights, the average high-temperature in October decreases from a pleasant 73.2°F (22.9°C) in September to a mild 59.9°F (15.5°C). Weather in October »

Weather in November

November, the last month of the autumn in Prospect Heights, is also a frosty month, with an average temperature fluctuating between 45.5°F (7.5°C) and 34°F (1.1°C). In Prospect Heights, the average high-temperature in November significantly decreases from a moderate 59.9°F (15.5°C) in October to a chilly 45.5°F (7.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Prospect Heights, Illinois, with temperature in the range of an average high of 34.7°F (1.5°C) and an average low of 25°F (-3.9°C). In Prospect Heights, the average high-temperature in December drops from a chilly 45.5°F (7.5°C) in November to a cold 34.7°F (1.5°C). Weather in December »
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FAQ

What is the coldest month in Prospect Heights?

January is the coldest month, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 18°F (-7.8°C).

What is the most humid month in Prospect Heights?

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

How many days does it rain in Prospect Heights?

In Prospect Heights, during the entire year, the rain falls for 153.3 days and collects up to 30.12" (765mm) of precipitation.

When does it snow in Prospect Heights?

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

What is the snowiest month in Prospect Heights?

The month with the most snowfall in Prospect Heights, Illinois, is January, when snow falls for 11.8 days and typically aggregates up to 4.96" (126mm) of snow.

How much does it snow in Prospect Heights?

In Prospect Heights, Illinois, during the entire year, snow falls for 43.6 days and aggregates up to 17.95" (456mm) of snow.

What is the month with the least sunshine in Prospect Heights?

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

When is Daylight Saving Time (DST) in Prospect Heights?

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 wettest month in Prospect Heights?

The month with the most rainfall in Prospect Heights, Illinois, is May, when the rain falls for 18 days and typically aggregates up to 3.9" (99mm) of precipitation.

When it does not snow in Prospect Heights?

June through September are months without snowfall.

When are the longest days in Prospect Heights?

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

When is the highest UV index in Prospect Heights?

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 Prospect Heights?

With an average high-temperature of 81.1°F (27.3°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 Prospect Heights?

The month with the most sunshine is July, with an average of 10.2h of sunshine.

What is the least humid month in Prospect Heights?

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

What is the driest month in Prospect Heights?

The month with the least rainfall in Prospect Heights, Illinois, is December, when the rain falls for 8.5 days and typically collects 1.46" (37mm) of precipitation.

What is the month with the shortest days in Prospect Heights?

With an average of 9h and 10min of daylight, December has the shortest days of the year.

When is the lowest UV index in Prospect Heights?

The month with the lowest UV index in Prospect Heights is December, with an average maximum UV index of 1.

Average temperature
Prospect Heights, IL

Average temperature - Prospect Heights, IL

The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.2°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 (18°F).

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Average pressure
Prospect Heights, IL

Average pressure - Prospect Heights, 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
Prospect Heights, IL

Average wind speed - Prospect Heights, IL

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).

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Average humidity
Prospect Heights, IL

Average humidity - Prospect Heights, 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
Prospect Heights, IL

Average rainfall - Prospect Heights, IL

The wettest month (with the highest rainfall) is May (3.9").
The driest month (with the least rainfall) is December (1.46").

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Average rainfall days
Prospect Heights, IL

Average rainfall days - Prospect Heights, IL

The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (5.6 days).

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Average snowfall
Prospect Heights, IL

Average snowfall - Prospect Heights, IL

The month with the highest snowfall is January (4.96").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
Prospect Heights, IL

Average snowfall days - Prospect Heights, IL

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
Prospect Heights, IL

Average daylight / Average sunshine - Prospect Heights, 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 10min).

The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

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Average sunshine days
Prospect Heights, IL

Average sunshine days - Prospect Heights, IL

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is June (10.7 days).

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Average visibility
Prospect Heights, IL

Average visibility - Prospect Heights, 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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