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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 varying between 28.8°F (-1.8°C) and 17.1°F (-8.3°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
February, the last month of the winter in Oak Brook, is an icy month, with an average temperature fluctuating between 19.9°F (-6.7°C) and 32.5°F (0.3°C). Oak Brook commences February with an average high-temperature of an icy 32.5°F (0.3°C), maintaining a close resemblance to the previous month. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Oak Brook, Illinois, with temperature in the range of an average high of 45.1°F (7.3°C) and an average low of 31.5°F (-0.3°C). In Oak Brook, stepping into March brings a temperature increase, moving up from February's wintry 32.5°F (0.3°C) to a chilly 45.1°F (7.3°C). Weather in March »
Weather in April
April in Oak Brook, Illinois, is a mild spring month, with an average temperature varying between 40.6°F (4.8°C) and 56.5°F (13.6°C). April's arrival brings a change in high-temperatures, moving from a frosty 45.1°F (7.3°C) in March to a refreshing 56.5°F (13.6°C). Weather in April »
Weather in May
The last month of the spring, May, is an agreeable month in Oak Brook, Illinois, with an average temperature ranging between max 68.9°F (20.5°C) and min 52.2°F (11.2°C). Oak Brook sees a rise in temperature during May, with average high-temperatures transitioning from a mild 56.5°F (13.6°C) in April to a pleasant 68.9°F (20.5°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Oak Brook, Illinois, with an average temperature varying between 78.3°F (25.7°C) and 61.7°F (16.5°C). An upsurge in temperatures occurs as May gives way to June, with average highs shifting from a pleasant 68.9°F (20.5°C) to a warm 78.3°F (25.7°C). Weather in June »
Weather in July
July, like June, in Oak Brook, Illinois, is another warm summer month, with an average temperature ranging between max 82.4°F (28°C) and min 66.4°F (19.1°C). With average high temperatures of 82.4°F (28°C) and lows of 66.4°F (19.1°C), July is the warmest month. July's average heat index is appraised at a tropical 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Oak Brook, is also a moderately hot month, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 81.1°F (27.3°C). During August, Oak Brook observes a subtle ascent to a still warm 81.1°F (27.3°C) from July's 82.4°F (28°C) in the average high-temperature. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Oak Brook, Illinois, with an average temperature fluctuating between 57.9°F (14.4°C) and 74.3°F (23.5°C). September is marked by a subtle drop in average high-temperatures, transitioning from a moderately hot 81.1°F (27.3°C) in August to a still warm 74.3°F (23.5°C). Weather in September »
Weather in October
October, the same as September, in Oak Brook, Illinois, is another refreshing autumn month, with an average temperature varying between 60.6°F (15.9°C) and 45.7°F (7.6°C). Oak Brook's October weather shows a moderate shift in high-temperatures, falling from September's warm 74.3°F (23.5°C) to a refreshing 60.6°F (15.9°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Oak Brook, Illinois, with an average temperature ranging between max 45.7°F (7.6°C) and min 33.6°F (0.9°C). In November, the meteorological conditions markedly change with the average high-temperature descending from a mild 60.6°F (15.9°C) in October to a frosty 45.7°F (7.6°C). Weather in November »
Weather in December
December, the first month of the winter in Oak Brook, is also a wintry month, with an average temperature varying between 34.5°F (1.4°C) and 25°F (-3.9°C). As November transitions into December, Oak Brook sees a drop in the average high-temperature, transitioning from a frosty 45.7°F (7.6°C) to a wintry 34.5°F (1.4°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in Oak Brook?
Oak Brook experiences its lowest temperatures in January, with an average peak of 28.8°F (-1.8°C) and a low of 17.1°F (-8.3°C).
What is the most humid month in Oak Brook?
January and February, with an average relative humidity of 82%, are most humid months in Oak Brook, Illinois.
How many days does it rain in Oak Brook?
Throughout the year, there are 118.5 rainfall days, and 13.74" (349mm) of precipitation is accumulated.
When does it snow in Oak Brook?
January through April, October through December are months with snowfall in Oak Brook.
How many days does it snow in Oak Brook?
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 in Oak Brook?
The month with the least sunshine in Oak Brook, Illinois, is January, with an average of 3.7h of sunshine.
When is the lowest UV index in Oak Brook?
With an average maximum UV index of 1, January is the month with the lowest UV index.
What is the snowiest month in Oak Brook?
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) in Oak Brook?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Oak Brook, Illinois, 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 in Oak Brook?
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?
In Oak Brook, snow does not fall in May through September.
When are the longest days in Oak Brook?
June has the longest days of the year, with an average of 15h and 12min of daylight.
What are the months with the highest UV index in Oak Brook?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Oak Brook, Illinois.
What are the warmest months in Oak Brook?
Oak Brook's July weather, with an average high temperature of 82.4°F (28°C) and an average low temperature of 66.4°F (19.1°C), tends to be the warmest of the year.
What month has the most sunshine in Oak Brook?
With an average of 10h of sunshine, August has the most sunshine of the year in Oak Brook, Illinois.
What is the least humid month in Oak Brook?
October is the least humid month in Oak Brook, with an average relative humidity of 72%.
What is the driest month in Oak Brook?
December is the month with the least rainfall in Oak Brook. Rain falls for 4.9 days and accumulates 0.63" (16mm) of precipitation.
What is the month with the shortest days in Oak Brook?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
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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