Climate and monthly weather forecastWillowbrook, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Willowbrook, Illinois, is a freezing cold winter month, with an average temperature varying between 18.3°F (-7.6°C) and 28.9°F (-1.7°C). With average high temperatures of 28.9°F (-1.7°C) and lows of 18.3°F (-7.6°C), January is the coldest month. Weather in January »Weather in February
The last month of the winter, February, is an icy month in Willowbrook, Illinois, with an average temperature fluctuating between 32.5°F (0.3°C) and 20.8°F (-6.2°C). As February unfolds, the average high-temperature reaches an icy 32.5°F (0.3°C), hinting at a slight fluctuation from the previous month. Weather in February »Weather in March
The first month of the spring, March, is a chilly month in Willowbrook, Illinois, with an average temperature fluctuating between 32°F (0°C) and 45.1°F (7.3°C). As Willowbrook welcomes March, the average high-temperature sees a rise, transitioning 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 mild spring month in Willowbrook, Illinois, with an average temperature ranging between min 40.8°F (4.9°C) and max 55.9°F (13.3°C). The start of April signals an increase in the average high-temperature, moving from a chilly 45.1°F (7.3°C) in March to a refreshing 55.9°F (13.3°C). Weather in April »Weather in May
May, the last month of the spring in Willowbrook, is an enjoyable month, with an average temperature fluctuating between 67.6°F (19.8°C) and 52°F (11.1°C). In Willowbrook, the onset of May comes with an increased average high-temperature, moving from April's mild 55.9°F (13.3°C) to a still refreshing 67.6°F (19.8°C). Weather in May »Weather in June
The first month of the summer, June, is a warm month in Willowbrook, Illinois, with an average temperature ranging between max 77.4°F (25.2°C) and min 61.7°F (16.5°C). June indicates a change in the average high-temperature, moving up from a comfortable 67.6°F (19.8°C) in May to a warm 77.4°F (25.2°C). Weather in June »Weather in July
July, like June, in Willowbrook, Illinois, is a moderately hot summer month, with an average temperature ranging between max 81.9°F (27.7°C) and min 66.6°F (19.2°C). In Willowbrook, the peak temperatures are generally noted in July, averaging a high of 81.9°F (27.7°C) and a low of 66.6°F (19.2°C). During July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Willowbrook, Illinois, with temperature in the range of an average high of 80.6°F (27°C) and an average low of 65.3°F (18.5°C). The commencement of August introduces an average high-temperature of a still moderately hot 80.6°F (27°C), closely mirroring the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Willowbrook, is still a warm month, with an average temperature varying between 58.6°F (14.8°C) and 74.1°F (23.4°C). A modest decline in the average high-temperature is seen during September, decreasing from a moderately hot 80.6°F (27°C) in August to a still warm 74.1°F (23.4°C). Weather in September »Weather in October
October, like September, in Willowbrook, Illinois, is another refreshing autumn month, with temperature in the range of an average low of 46.9°F (8.3°C) and an average high of 60.8°F (16°C). The shift from September to October corresponds with a decrease in the average high-temperature, down to an enjoyable 60.8°F (16°C) from a moderately hot 74.1°F (23.4°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in Willowbrook, Illinois, with an average temperature varying between 33.8°F (1°C) and 46.2°F (7.9°C). The shift into November is marked by a noticeable reduction in the average high-temperature, decreasing from October's comfortable 60.8°F (16°C) to a frosty 46.2°F (7.9°C). Weather in November »Weather in December
December, the first month of the winter in Willowbrook, is also an icy month, with an average temperature ranging between min 25.5°F (-3.6°C) and max 35.2°F (1.8°C). In December, the average high-temperature decreases from a frosty 46.2°F (7.9°C) in November to an icy 35.2°F (1.8°C). Weather in December »Updated: Feb 12, 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
Willowbrook's temperature records reveal January as the coldest month, marked by average highs of 28.9°F (-1.7°C) and lows of 18.3°F (-7.6°C).
January and February, with an average relative humidity of 82%, are most humid months.
In Willowbrook, during the entire year, the rain falls for 166.8 days and collects up to 34.96" (888mm) of precipitation.
January through April, October through December are months with snowfall in Willowbrook.
In Willowbrook, during the entire year, snow falls for 47.1 days and aggregates up to 19.02" (483mm) of snow.
The month with the least sunshine in Willowbrook is January, with an average of 3.7h of sunshine.
The month with the most snowfall is February, when snow falls for 11.8 days and typically aggregates up to 5.28" (134mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Willowbrook, 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.
May is the month with the most rainfall. Rain falls for 19.2 days and accumulates 4.61" (117mm) of precipitation.
In Willowbrook, Illinois, snow does not fall in May through September.
With an average of 15h and 12min of daylight, June has the longest days of the year.
In Willowbrook, the peak average temperatures are observed in July, with a high of 81.9°F (27.7°C) and a low of 66.6°F (19.2°C).
July and August, with an average maximum UV index of 6, are months with the highest UV index.
The month with the most sunshine is August, with an average of 10.3h of sunshine.
October is the least humid month in Willowbrook, Illinois, with an average relative humidity of 72%.
November and December are months with the least rain when the rain falls for 10.5 days and typically aggregates up to 1.77" (45mm) of rain.
The month with the shortest days in Willowbrook, Illinois, is December, with an average of 9h and 12min of daylight.
The month with the lowest UV index in Willowbrook is December, with an average maximum UV index of 1.
Average temperature
Willowbrook, IL
The warmest month (with the highest average high temperature) is July (81.9°F).
The month with the lowest average high temperature is January (28.9°F).
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (18.3°F).
Average pressure
Willowbrook, 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
Willowbrook, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.4mph - Average wind speed in April:
9.7mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.4mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.7mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity
Willowbrook, 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
Willowbrook, IL
- Average rainfall in January:
1.89" - Average rainfall in February:
1.81" - Average rainfall in March:
2.09" - Average rainfall in April:
3.66" - Average rainfall in May:
4.61" - Average rainfall in June:
4.41"
- Average rainfall in July:
3.86" - Average rainfall in August:
3.46" - Average rainfall in September:
2.68" - Average rainfall in October:
2.95" - Average rainfall in November:
1.77" - Average rainfall in December:
1.77"
The wettest month (with the highest rainfall) is May (4.61").
The driest months (with the least rainfall) are November and December (1.77").
Average rainfall days
Willowbrook, IL
- Average rainfall days in January:
7.8 days - Average rainfall days in February:
5.9 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
17.6 days - Average rainfall days in May:
19.2 days - Average rainfall days in June:
19.4 days
- Average rainfall days in July:
18.7 days - Average rainfall days in August:
17.4 days - Average rainfall days in September:
15 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
8.5 days
The month with the highest number of rainy days is June (19.4 days).
The month with the least rainy days is February (5.9 days).
Average snowfall
Willowbrook, IL
The month with the highest snowfall is February (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Willowbrook, IL
- Average snowfall days in January:
13.3 days - Average snowfall days in February:
11.8 days - Average snowfall days in March:
6.8 days - Average snowfall days in April:
1.8 days - Average snowfall days in May:
0 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:
0.2 days - Average snowfall days in November:
3.6 days - Average snowfall days in December:
9.6 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Willowbrook, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 12min
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 42min - Average sunshine in February:
3h and 54min - Average sunshine in March:
6h and 6min - Average sunshine in April:
7h and 42min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 48min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 18min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 54min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Willowbrook, IL
- Average sunshine days in January:
12.8 days - Average sunshine days in February:
11.6 days - Average sunshine days in March:
13.2 days - Average sunshine days in April:
9.5 days - Average sunshine days in May:
9.5 days - Average sunshine days in June:
8.2 days
- Average sunshine days in July:
8.8 days - Average sunshine days in August:
9.5 days - Average sunshine days in September:
11.9 days - Average sunshine days in October:
14 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
14.3 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is June (8.2 days).
Average UV index
Willowbrook, IL
The months with the highest UV index are July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Willowbrook, IL
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Willowbrook, 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).
