Climate and monthly weather forecast
Vernon Hills, IL

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Weather in January

January, like December, is another subzero cold winter month in Vernon Hills, Illinois, with an average temperature fluctuating between 16.5°F (-8.6°C) and 27.9°F (-2.3°C). January, with average temperatures reaching a high of 27.9°F (-2.3°C) and a low of 16.5°F (-8.6°C), is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is also a subzero cold month in Vernon Hills, Illinois, with temperature in the range of an average high of 31.3°F (-0.4°C) and an average low of 19.2°F (-7.1°C). The average high-temperature is a still subzero cold 31.3°F (-0.4°C) in February, hardly different from the 27.9°F (-2.3°C) recorded in January. Weather in February »

Weather in March

The first month of the spring, March, is a chilly month in Vernon Hills, Illinois, with an average temperature varying between 30.4°F (-0.9°C) and 43.2°F (6.2°C). Vernon Hills sees an increase in average high-temperatures during March, moving from a subzero cold 31.3°F (-0.4°C) in February to a chilly 43.2°F (6.2°C). Weather in March »

Weather in April

April in Vernon Hills, Illinois, is a fresh spring month, with an average temperature fluctuating between 39°F (3.9°C) and 54.1°F (12.3°C). April brings a rise in the average high-temperature, transitioning from March's chilly 43.2°F (6.2°C) to a fresh 54.1°F (12.3°C). Weather in April »

Weather in May

May, the last month of the spring in Vernon Hills, is a comfortable month, with an average temperature varying between 50°F (10°C) and 65.8°F (18.8°C). The shift into May is characterized by a rise in the average high-temperature, transitioning from April's fresh 54.1°F (12.3°C) to a comfortable 65.8°F (18.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in Vernon Hills, Illinois, with an average temperature ranging between min 59°F (15°C) and max 75.6°F (24.2°C). June's arrival sees a rise in the average high-temperature, jumping from May's enjoyable 65.8°F (18.8°C) to a warm 75.6°F (24.2°C). Weather in June »

Weather in July

July, like June, in Vernon Hills, Illinois, is another warm summer month, with an average temperature ranging between min 64.9°F (18.3°C) and max 80.4°F (26.9°C). Vernon Hills records the warmest temperatures in July, averaging a high of 80.4°F (26.9°C) and a low of 64.9°F (18.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Vernon Hills, Illinois, with an average temperature ranging between min 63.7°F (17.6°C) and max 79.3°F (26.3°C). Vernon Hills's average high-temperature in August is a still warm 79.3°F (26.3°C), marking an insignificant difference from the 80.4°F (26.9°C) of July. Weather in August »

Weather in September

September, the first month of the autumn in Vernon Hills, is still a pleasant month, with temperature in the range of an average high of 72.9°F (22.7°C) and an average low of 57.4°F (14.1°C). The start of September involves a subtle temperature drop, shifting from a warm 79.3°F (26.3°C) in August to an agreeable 72.9°F (22.7°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Vernon Hills, Illinois, with an average temperature varying between 45.5°F (7.5°C) and 59.2°F (15.1°C). As October commences, the average high-temperature shows a reduction, transitioning from an agreeable 72.9°F (22.7°C) in September to a refreshing 59.2°F (15.1°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Vernon Hills, Illinois, with an average temperature fluctuating between 45.3°F (7.4°C) and 33.3°F (0.7°C). Onset of November witnesses a reduction in the average high-temperature, falling from a mild 59.2°F (15.1°C) in October to a frosty 45.3°F (7.4°C). Weather in November »

Weather in December

December, the first month of the winter in Vernon Hills, is still a cold month, with an average temperature ranging between min 24.3°F (-4.3°C) and max 33.6°F (0.9°C). The transition into December involves a decrease in the average high-temperature, falling from a frosty 45.3°F (7.4°C) in November to a wintry 33.6°F (0.9°C). Weather in December »
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

Vernon Hills's coldest weather arrives in January, when temperatures average a high of 27.9°F (-2.3°C) and a low of 16.5°F (-8.6°C).

What is the most humid month?

January and February, with an average relative humidity of 83%, are most humid months.

How much does it rain?

In Vernon Hills, during the entire year, the rain falls for 147.3 days and collects up to 27.44" (697mm) of precipitation.

When does it snow?

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

How much does it snow in Vernon Hills?

Throughout the year, there are 48.2 snowfall days, and 18.86" (479mm) of snow is accumulated.

What is the month with the least sunshine?

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

When does it snow the most in Vernon Hills?

February is the month with the most snowfall. Snow falls for 11 days and accumulates 5.55" (141mm) of snow.

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 rainiest month?

The month with the most rainfall in Vernon Hills is June, when the rain falls for 17.2 days and typically aggregates up to 3.54" (90mm) of precipitation.

When it does not snow?

June through September are months without snowfall.

When are the longest days?

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

What part of the year is the hottest?

Vernon Hills's temperatures peak on average in July, reaching 80.4°F (26.9°C) at their highest and 64.9°F (18.3°C) at their lowest.

What are the months with the most sunshine?

The months with the most sunshine are July and August, with an average of 10.1h of sunshine.

What is the month with the highest UV index?

July and August, with an average maximum UV index of 6, are months with the highest UV index.

What is the least humid month?

October is the least humid month, with an average relative humidity of 74%.

What is the driest month?

The months with the least rainfall are November and December Rain falls for 7.8 days and accumulates 1.3" (33mm) of rain.

What is the month with the shortest days?

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

What is the month with the lowest UV index?

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

Average temperature
Vernon Hills, IL

Average temperature - Vernon Hills, IL

The warmest month (with the highest average high temperature) is July (80.4°F).
The month with the lowest average high temperature is January (27.9°F).

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).

Average pressure
Vernon Hills, IL

Average pressure - Vernon Hills, IL

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed
Vernon Hills, IL

Average wind speed - Vernon Hills, IL

The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).

Average humidity
Vernon Hills, IL

Average humidity - Vernon Hills, IL

The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).

Average rainfall
Vernon Hills, IL

Average rainfall - Vernon Hills, IL

The wettest month (with the highest rainfall) is June (3.54").
The driest months (with the least rainfall) are November and December (1.3").

Average rainfall days
Vernon Hills, IL

Average rainfall days - Vernon Hills, IL

The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is February (4.3 days).

Average snowfall
Vernon Hills, IL

Average snowfall - Vernon Hills, IL

The month with the highest snowfall is February (5.55").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Vernon Hills, IL

Average snowfall days - Vernon Hills, IL

The month with the highest number of snowfall days is January (12.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Vernon Hills, IL

Average daylight / Average sunshine - Vernon Hills, 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 months with the most sunshine are July and August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days
Vernon Hills, IL

Average sunshine days - Vernon Hills, IL

The month with the most sunshine days is November (16.6 days).
The month with the least sunshine days is June (10 days).

Average visibility
Vernon Hills, IL

Average visibility - Vernon Hills, 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).

Vernon Hills, Illinois, USA

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