Climate and monthly weather forecast
McHenry, IL

Weather in January

January, the same as December, in McHenry, Illinois, is another subzero cold winter month, with an average temperature fluctuating between 14.9°F (-9.5°C) and 26.6°F (-3°C). With an average high-temperature of 26.6°F (-3°C) and an average low-temperature of 14.9°F (-9.5°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in McHenry, is also a subzero cold month, with an average temperature varying between 30.2°F (-1°C) and 18°F (-7.8°C). In February, the average high-temperature is relatively the same as in January - a still subzero cold 30.2°F (-1°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in McHenry, Illinois, with an average temperature varying between 28.9°F (-1.7°C) and 42.8°F (6°C). In McHenry, the average high-temperature in March increases from a freezing cold 30.2°F (-1°C) in February to a chilly 42.8°F (6°C). Weather in March »

Weather in April

April in McHenry, Illinois, is a fresh spring month, with an average temperature ranging between min 38.3°F (3.5°C) and max 54.3°F (12.4°C). In April, the average high-temperature rises from a chilly 42.8°F (6°C) in March to a cool 54.3°F (12.4°C). Weather in April »

Weather in May

May, the last month of the spring in McHenry, is a comfortable month, with an average temperature ranging between max 66.4°F (19.1°C) and min 49.3°F (9.6°C). In McHenry, the average high-temperature in May rises from a fresh 54.3°F (12.4°C) in April to a comfortable 66.4°F (19.1°C). Weather in May »

Weather in June

The first month of the summer, June, is a moderately hot month in McHenry, Illinois, with an average temperature varying between 58.5°F (14.7°C) and 75.6°F (24.2°C). In June, the average high-temperature rises from a comfortable 66.4°F (19.1°C) in May to a moderately hot 75.6°F (24.2°C). Weather in June »

Weather in July

July, like June, in McHenry, Illinois, is another warm summer month, with an average temperature ranging between min 63.1°F (17.3°C) and max 79.7°F (26.5°C). July is the warmest month, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 63.1°F (17.3°C). Weather in July »

Weather in August

The last month of the summer, August, is another warm month in McHenry, Illinois, with an average temperature varying between 61.3°F (16.3°C) and 78.1°F (25.6°C). In McHenry, the average high-temperature in August is almost the same as in July - a still warm 78.1°F (25.6°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in McHenry, Illinois, with an average temperature fluctuating between 55°F (12.8°C) and 72.3°F (22.4°C). In September, the average high-temperature slightly decreases from a warm 78.1°F (25.6°C) in August to an agreeable 72.3°F (22.4°C). Weather in September »

Weather in October

October, the same as September, in McHenry, Illinois, is a moderate autumn month, with an average temperature ranging between min 43.9°F (6.6°C) and max 58.6°F (14.8°C). In McHenry, the average high-temperature in October decreases from a pleasant 72.3°F (22.4°C) in September to a moderate 58.6°F (14.8°C). Weather in October »

Weather in November

November, the last month of the autumn in McHenry, is another chilly month, with an average temperature ranging between max 44.6°F (7°C) and min 32.2°F (0.1°C). In November, the average high-temperature decreases from a moderate 58.6°F (14.8°C) in October to a chilly 44.6°F (7°C). Weather in November »

Weather in December

December, the first month of the winter in McHenry, is also a wintry month, with an average temperature fluctuating between 32.7°F (0.4°C) and 22.8°F (-5.1°C). In December, the average high-temperature decreases from a chilly 44.6°F (7°C) in November to a wintry 32.7°F (0.4°C). Weather in December »
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FAQ

What is the coldest month in McHenry?

January is the coldest month in McHenry, with an average high-temperature of 26.6°F (-3°C) and an average low-temperature of 14.9°F (-9.5°C).

What are the most humid months in McHenry?

January and February, with an average relative humidity of 85%, are most humid months in McHenry, Illinois.

How many days does it rain in McHenry?

In McHenry, Illinois, during the entire year, the rain falls for 152.4 days and collects up to 28.07" (713mm) of precipitation.

When does it snow in McHenry?

January through May, October through December are months with snowfall in McHenry, Illinois.

When does it snow the most in McHenry?

January is the month with the most snowfall in McHenry, Illinois. Snow falls for 13.3 days and accumulates 5.16" (131mm) of snow.

How much does it snow in McHenry?

Throughout the year, there are 49 snowfall days, and 16.5" (419mm) of snow is accumulated.

What is the month with the least sunshine in McHenry?

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

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

January and December, with an average maximum UV index of 1, are months with the lowest UV index.

When is Daylight Saving Time (DST) in McHenry?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in McHenry, Illinois, 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 McHenry?

The month with the most rainfall is June, when the rain falls for 17.2 days and typically aggregates up to 3.58" (91mm) of precipitation.

When it does not snow in McHenry?

June through September are months without snowfall.

When are the longest days in McHenry?

With an average of 15h and 14min of daylight, June has the longest days of the year in McHenry.

What is the warmest month in McHenry?

July is the warmest month in McHenry, with an average high-temperature of 79.7°F (26.5°C) and an average low-temperature of 63.1°F (17.3°C).

What are the months with the most sunshine in McHenry?

July and August, with an average of 10h of sunshine, are months with the most sunshine.

When is the highest UV index in McHenry?

August is the month with the highest UV index in McHenry, Illinois, with an average maximum UV index of 6.

What is the least humid month in McHenry?

October is the least humid month in McHenry, with an average relative humidity of 76%.

What is the driest month in McHenry?

The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.34" (34mm) of precipitation.

What is the month with the shortest days in McHenry?

December has the shortest days of the year in McHenry, with an average of 9h and 8min of daylight.

Average temperature
McHenry, IL

Average temperature - McHenry, IL

The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.6°F).

The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).

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Average pressure
McHenry, IL

Average pressure - McHenry, 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
McHenry, IL

Average wind speed - McHenry, IL

The windiest month (with the highest average wind speed) is January (10mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).

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Average humidity
McHenry, IL

Average humidity - McHenry, IL

The months with the highest relative humidity are January and February (85%).
The month with the lowest relative humidity is October (76%).

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Average rainfall
McHenry, IL

Average rainfall - McHenry, IL

The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.34").

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Average rainfall days
McHenry, IL

Average rainfall days - McHenry, IL

The month with the highest number of rainy days is July (18.3 days).
The month with the least rainy days is February (4.9 days).

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Average snowfall
McHenry, IL

Average snowfall - McHenry, IL

The month with the highest snowfall is January (5.16").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days
McHenry, IL

Average snowfall days - McHenry, IL

The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average daylight / Average sunshine
McHenry, IL

Average daylight / Average sunshine - McHenry, IL

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

The months with the most sunshine are July and 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
McHenry, IL

Average sunshine days - McHenry, IL

The month with the most sunshine days is November (16 days).
The month with the least sunshine days is June (10.2 days).

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Average visibility
McHenry, IL

Average visibility - McHenry, 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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