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Contents
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average pressure
- Average wind speed
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
- Average sunshine days
- Average UV index
- Average cloud cover
- Average visibility
Weather in January
January, like December, is a freezing cold winter month in Oak Brook, Illinois, with an average temperature ranging between min 17.1°F (-8.3°C) and max 28.8°F (-1.8°C). January is Oak Brook's coldest month, registering average high temperatures of 28.8°F (-1.8°C) and lows of 17.1°F (-8.3°C). Weather in January »
Weather in February
The last month of the winter, February, is an icy month in Oak Brook, Illinois, with an average temperature varying between 32.5°F (0.3°C) and 19.9°F (-6.7°C). Oak Brook's weather in February, with an average high-temperature of a cold 32.5°F (0.3°C), subtly shifts from January's 28.8°F (-1.8°C). Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Oak Brook, Illinois, with an average temperature fluctuating between 45.1°F (7.3°C) and 31.5°F (-0.3°C). The onset of March brings a rise in the average high-temperature, elevating from a wintry 32.5°F (0.3°C) in February to a chilly 45.1°F (7.3°C). Weather in March »
Weather in April
April is a refreshing spring month in Oak Brook, Illinois, with an average temperature ranging between min 40.6°F (4.8°C) and max 56.5°F (13.6°C). Oak Brook sees a rise in temperature during April, with average high-temperatures transitioning from a chilly 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 Oak Brook, Illinois, with an average temperature fluctuating between 68.9°F (20.5°C) and 52.2°F (11.2°C). In Oak Brook, the onset of May comes with an increased average high-temperature, moving from April's refreshing 56.5°F (13.6°C) to an agreeable 68.9°F (20.5°C). Weather in May »
Weather in June
June, the first month of the summer in Oak Brook, is a moderately hot month, with temperature in the range of an average low of 61.7°F (16.5°C) and an average high of 78.3°F (25.7°C). June's arrival signals a temperature shift, moving 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 Oak Brook, Illinois, is a moderately hot summer month, with an average temperature fluctuating between 66.4°F (19.1°C) and 82.4°F (28°C). Temperature records mark July as the warmest month, with highs averaging 82.4°F (28°C) and lows at 66.4°F (19.1°C). July's average heat index is appraised at a hot 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Oak Brook, Illinois, with an average temperature ranging between min 64.8°F (18.2°C) and max 81.1°F (27.3°C). Transitioning from July to August, Oak Brook observes an average high-temperature of a still moderately hot 81.1°F (27.3°C), differing subtly from the previous month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Oak Brook, Illinois, with an average temperature fluctuating between 74.3°F (23.5°C) and 57.9°F (14.4°C). As September arrives, Oak Brook's weather displays a minor decrease in high-temperatures, transitioning from August's 81.1°F (27.3°C) to a still moderately hot 74.3°F (23.5°C). Weather in September »
Weather in October
October, the same as September, in Oak Brook, Illinois, is a moderate autumn month, with an average temperature varying between 45.7°F (7.6°C) and 60.6°F (15.9°C). October suggests a modest reduction in the average high-temperature, shifting from a moderately hot 74.3°F (23.5°C) in September to a refreshing 60.6°F (15.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Oak Brook, is another chilly month, with an average temperature fluctuating between 45.7°F (7.6°C) and 33.6°F (0.9°C). The onset of November witnesses a clear shift in the average high-temperature, dropping from a refreshing 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 Oak Brook, Illinois, with an average temperature varying between 34.5°F (1.4°C) and 25°F (-3.9°C). December suggests a modest reduction in the average high-temperature, shifting from a chilly 45.7°F (7.6°C) in November to a cold 34.5°F (1.4°C). Weather in December »
Updated: Jul 27, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
January, with average temperatures reaching a high of 28.8°F (-1.8°C) and a low of 17.1°F (-8.3°C), is the coldest month.
What is the most humid month?
January and February, with an average relative humidity of 82%, are most humid months in Oak Brook.
How many days does it rain?
Throughout the year, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.
When does it snow?
January through April, October through December are months with snowfall.
How many days does it snow?
In Oak Brook, 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?
January has the least sunshine of the year, with an average of 3.7h of sunshine.
What is the month with the lowest UV index?
With an average maximum UV index of 1, January is the month with the lowest UV index in Oak Brook.
When does it snow the most?
February is the month with the most snowfall. Snow falls for 8.6 days and accumulates 2.28" (58mm) 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 Oak Brook 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 Oak Brook, snow does not fall in May through September.
When are the longest days?
The month with the longest days in Oak Brook is June, with an average of 15h and 12min of daylight.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What month is the hottest?
July, with an average high of 82.4°F (28°C) and a low of 66.4°F (19.1°C), signifies the warmest month of the year.
What month has the most sunshine?
August has the most sunshine of the year, with an average of 10h of sunshine.
What is the least humid month?
October is the least humid month, with an average relative humidity of 72%.
What is the driest month in Oak Brook?
December is the month with the least rainfall. Rain falls for 4.9 days and accumulates 0.63" (16mm) 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.
Average temperature
Oak Brook, 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).
Average pressure
Oak Brook, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.09"Hg
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
Oak Brook, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.2mph - Average wind speed in April:
9.4mph - Average wind speed in May:
8mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.1mph - Average wind speed in September:
7mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9mph
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).
Average humidity
Oak Brook, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Oak Brook, IL
- Average rainfall in January:
0.67" - Average rainfall in February:
0.71" - Average rainfall in March:
0.75" - Average rainfall in April:
1.38" - Average rainfall in May:
1.97" - Average rainfall in June:
1.61"
- Average rainfall in July:
1.61" - Average rainfall in August:
1.34" - Average rainfall in September:
1.18" - Average rainfall in October:
1.22" - Average rainfall in November:
0.67" - Average rainfall in December:
0.63"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is December (0.63").
Average rainfall days
Oak Brook, IL
- Average rainfall days in January:
4.3 days - Average rainfall days in February:
4.2 days - Average rainfall days in March:
9.1 days - Average rainfall days in April:
12.8 days - Average rainfall days in May:
14.9 days - Average rainfall days in June:
14.3 days
- Average rainfall days in July:
14.6 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.8 days - Average rainfall days in November:
5.9 days - Average rainfall days in December:
4.9 days
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).
Average snowfall
Oak Brook, 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").
Average snowfall days
Oak Brook, IL
- Average snowfall days in January:
9.7 days - Average snowfall days in February:
8.6 days - Average snowfall days in March:
4.9 days - Average snowfall days in April:
1.4 days - Average snowfall days in May:
0.1 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.4 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
7.2 days
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).
Average daylight / Average sunshine
Oak Brook, IL
- Average daylight in January:
9h and 4min - Average daylight in February:
10h and 4min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 2min - Average daylight in May:
14h and 4min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 4min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 1min
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).
Average sunshine days
Oak Brook, IL
- Average sunshine days in January:
19.7 days - Average sunshine days in February:
17.3 days - Average sunshine days in March:
17.4 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
13.7 days - Average sunshine days in June:
12.3 days
- Average sunshine days in July:
11.8 days - Average sunshine days in August:
14.8 days - Average sunshine days in September:
16.1 days - Average sunshine days in October:
19.6 days - Average sunshine days in November:
20.4 days - Average sunshine days in December:
20.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is July (11.8 days).
Average UV index
Oak Brook, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Oak Brook, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 31).
Average visibility
Oak Brook, 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).
Oak Brook, Illinois, USA
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