Climate and monthly weather forecast
Northbrook, IL

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Weather in January

January, the same as December, in Northbrook, Illinois, is a freezing cold winter month, with an average temperature fluctuating between 28.8°F (-1.8°C) and 18.9°F (-7.3°C). January is Northbrook's coldest month, registering average high temperatures of 28.8°F (-1.8°C) and lows of 18.9°F (-7.3°C). Weather in January »

Weather in February

February, the last month of the winter in Northbrook, is also a subzero cold month, with an average temperature varying between 21.6°F (-5.8°C) and 31.8°F (-0.1°C). An average high-temperature of a still subzero cold 31.8°F (-0.1°C) marks February, exhibiting a close resemblance to the conditions in January. Weather in February »

Weather in March

March, the first month of the spring in Northbrook, is an icy month, with an average temperature fluctuating between 42.3°F (5.7°C) and 31.5°F (-0.3°C). March's onset witnesses a shift in the average high-temperature, moving from a freezing cold 31.8°F (-0.1°C) in February to a wintry 42.3°F (5.7°C). Weather in March »

Weather in April

April in Northbrook, Illinois, is a fresh spring month, with an average temperature ranging between min 39.7°F (4.3°C) and max 52°F (11.1°C). In Northbrook, the onset of April comes with an increased average high-temperature, moving from March's wintry 42.3°F (5.7°C) to a cool 52°F (11.1°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Northbrook, Illinois, with an average temperature varying between 62.8°F (17.1°C) and 50.4°F (10.2°C). The onset of May marks an increase in the average high-temperature, moving from a fresh 52°F (11.1°C) in April to a comfortable 62.8°F (17.1°C). Weather in May »

Weather in June

June, the first month of the summer in Northbrook, is an agreeable month, with an average temperature varying between 60.1°F (15.6°C) and 72.5°F (22.5°C). As Northbrook welcomes June, the average high-temperature sees a rise, transitioning from a comfortable 62.8°F (17.1°C) in May to a pleasant 72.5°F (22.5°C). Weather in June »

Weather in July

July in Northbrook, Illinois, is a moderately hot summer month, with temperature in the range of an average high of 79.2°F (26.2°C) and an average low of 67.1°F (19.5°C). The warmest month is July, with an average high-temperature of 79.2°F (26.2°C) and an average low-temperature of 67.1°F (19.5°C). Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Northbrook, Illinois, with an average temperature fluctuating between 66.9°F (19.4°C) and 78.1°F (25.6°C). Northbrook transitions into August recording an average high-temperature of a still moderately hot 78.1°F (25.6°C), closely aligning with the preceding month's temperature. Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Northbrook, Illinois, with an average temperature fluctuating between 60.3°F (15.7°C) and 71.6°F (22°C). September brings a minor shift in the average high-temperature, adjusting from a warm 78.1°F (25.6°C) in August to an agreeable 71.6°F (22°C). Weather in September »

Weather in October

October, the same as September, in Northbrook, Illinois, is another mild autumn month, with an average temperature ranging between max 59.5°F (15.3°C) and min 47.7°F (8.7°C). Northbrook's transition into October involves a shift in temperature, receding from a pleasant 71.6°F (22°C) in September to a moderate 59.5°F (15.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Northbrook, Illinois, with an average temperature fluctuating between 45.5°F (7.5°C) and 35.1°F (1.7°C). With the beginning of November, the average high-temperature shows a decrease, transitioning from a moderate 59.5°F (15.3°C) in October to a frosty 45.5°F (7.5°C). Weather in November »

Weather in December

December, the first month of the winter in Northbrook, is also a wintry month, with an average temperature varying between 26.1°F (-3.3°C) and 34.9°F (1.6°C). The shift to December brings a decrease in the average high-temperature, falling from a chilly 45.5°F (7.5°C) in November to a cold 34.9°F (1.6°C). Weather in December »
Updated: Jul 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What time of the year is the coldest?

Northbrook reaches its average lowest temperatures in January, measuring 28.8°F (-1.8°C) at the peak and 18.9°F (-7.3°C) at the lowest.

What is the most humid month?

With an average relative humidity of 82%, January is the most humid month.

How many days does it rain?

Throughout the year, there are 164.7 rainfall days, and 35.28" (896mm) of precipitation is accumulated.

When does it snow?

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

What is the snowiest month?

The month with the most snowfall is January, when snow falls for 13.1 days and typically aggregates up to 4.84" (123mm) of snow.

How many days does it snow?

In Northbrook, during the entire year, snow falls for 47.6 days and aggregates up to 17.8" (452mm) of snow.

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 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 wettest month?

The wettest months are May and June, with an average 4.57" (116mm) of rainfall.

When it does not snow?

June through September are months without snowfall.

When are the longest days in Northbrook?

The month with the longest days is June, with an average of 15h and 12min of daylight.

What is the month with the highest UV index?

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

What time of the year is the hottest?

In Northbrook, July is the warmest month, with temperatures averaging a high of 79.2°F (26.2°C) and a low of 67.1°F (19.5°C).

What is the month with the most sunshine?

July and August, with an average of 10.4h of sunshine, are months with the most sunshine.

What is the least humid month?

October is the least humid month, with an average relative humidity of 73%.

What is the driest month?

December is the month with the least rainfall. Rain falls for 9.1 days and accumulates 1.65" (42mm) of precipitation.

What is the month with the shortest days?

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

What is the month with the lowest UV index?

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

Average temperature
Northbrook, IL

Average temperature - Northbrook, IL

The warmest month (with the highest average high temperature) is July (79.2°F).
The month with the lowest average high temperature is January (28.8°F).

The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).

Average pressure
Northbrook, IL

Average pressure - Northbrook, 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).

Average wind speed
Northbrook, IL

Average wind speed - Northbrook, IL

The windiest month (with the highest average wind speed) is January (11.5mph).
The calmest month (with the lowest average wind speed) is August (7.1mph).

Average humidity
Northbrook, IL

Average humidity - Northbrook, IL

The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (73%).

Average rainfall
Northbrook, IL

Average rainfall - Northbrook, IL

The wettest months (with the highest rainfall) are May and June (4.57").
The driest month (with the least rainfall) is December (1.65").

Average rainfall days
Northbrook, IL

Average rainfall days - Northbrook, IL

The month with the highest number of rainy days is May (19.1 days).
The month with the least rainy days is February (6.1 days).

Average snowfall
Northbrook, IL

Average snowfall - Northbrook, IL

The month with the highest snowfall is January (4.84").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Northbrook, IL

Average snowfall days - Northbrook, 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).

Average daylight / Average sunshine
Northbrook, IL

Average daylight / Average sunshine - Northbrook, 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 24min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).

Average sunshine days
Northbrook, IL

Average sunshine days - Northbrook, IL

The month with the most sunshine days is November (15.5 days).
The month with the least sunshine days is June (9.2 days).

Average visibility
Northbrook, IL

Average visibility - Northbrook, 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).

Northbrook, Illinois, USA

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