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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 Flossmoor, Illinois, with an average temperature ranging between max 29.7°F (-1.3°C) and min 18.9°F (-7.3°C). Flossmoor's coldest temperatures are experienced in January, with average high temperatures of 29.7°F (-1.3°C) and lows of 18.9°F (-7.3°C). Weather in January »
Weather in February
February, the last month of the winter in Flossmoor, is a cold month, with an average temperature varying between 33.1°F (0.6°C) and 21.2°F (-6°C). Entering February, the average high-temperature is recorded at an icy 33.1°F (0.6°C), exhibiting a minimal shift from January's 29.7°F (-1.3°C). Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Flossmoor, Illinois, with temperature in the range of an average high of 45.5°F (7.5°C) and an average low of 32.4°F (0.2°C). Flossmoor sees a rise in temperature during March, with average high-temperatures transitioning from a wintry 33.1°F (0.6°C) in February to a chilly 45.5°F (7.5°C). Weather in March »
Weather in April
April in Flossmoor, Illinois, is a refreshing spring month, with temperature in the range of an average low of 41.7°F (5.4°C) and an average high of 56.7°F (13.7°C). Flossmoor, Illinois, sees an increase in the average high-temperature with the arrival of April, moving from March's chilly 45.5°F (7.5°C) to a mild 56.7°F (13.7°C). Weather in April »
Weather in May
May, the last month of the spring in Flossmoor, is an agreeable month, with temperature in the range of an average high of 68.7°F (20.4°C) and an average low of 52.3°F (11.3°C). As Flossmoor transitions into May, the average high-temperature shows a change, moving from a moderate 56.7°F (13.7°C) in April to an agreeable 68.7°F (20.4°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Flossmoor, Illinois, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 61.7°F (16.5°C). June's onset brings a temperature rise, moving from an agreeable 68.7°F (20.4°C) in May to a warm 77.7°F (25.4°C). Weather in June »
Weather in July
July, like June, in Flossmoor, Illinois, is a moderately hot summer month, with an average temperature varying between 81.3°F (27.4°C) and 65.8°F (18.8°C). With average temperatures fluctuating between a high of 81.3°F (27.4°C) and a low of 65.8°F (18.8°C), July stands out as the warmest month. For most parts of July, the heat index is calculated to be a tropical 87.8°F (31°C). Weather in July »
Weather in August
August, the last month of the summer in Flossmoor, is another warm month, with temperature in the range of an average high of 80.1°F (26.7°C) and an average low of 64.6°F (18.1°C). The weather during August records an average high-temperature of a still warm 80.1°F (26.7°C), closely mirroring the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Flossmoor, Illinois, with an average temperature ranging between max 73.9°F (23.3°C) and min 58.3°F (14.6°C). The arrival of September signals a subtle shift in temperature, down from 80.1°F (26.7°C) in August to a still moderately hot 73.9°F (23.3°C). Weather in September »
Weather in October
October, like September, in Flossmoor, Illinois, is another refreshing autumn month, with an average temperature fluctuating between 61.2°F (16.2°C) and 46.9°F (8.3°C). October's arrival coincides with a drop in the average high-temperature, decreasing from September's warm 73.9°F (23.3°C) to an enjoyable 61.2°F (16.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is another chilly month in Flossmoor, Illinois, with an average temperature varying between 46.9°F (8.3°C) and 34.9°F (1.6°C). Flossmoor in November experiences a subtle temperature decline, with average high-temperatures reducing from an enjoyable 61.2°F (16.2°C) in October to a chilly 46.9°F (8.3°C). Weather in November »
Weather in December
December, the first month of the winter in Flossmoor, is still a cold month, with an average temperature ranging between max 35.6°F (2°C) and min 25.9°F (-3.4°C). Transition from November to December is accompanied by a temperature drop, with average high-temperatures decreasing from a chilly 46.9°F (8.3°C) to a wintry 35.6°F (2°C). Weather in December »
Updated: Aug 15, 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?
Temperature readings reach their annual highs in January, averaging 29.7°F (-1.3°C) and a minimum average of 18.9°F (-7.3°C).
What is the most humid month?
The months with the highest humidity are January and February, with an average relative humidity of 82%.
How much does it rain?
In Flossmoor, Illinois, during the entire year, the rain falls for 155.6 days and collects up to 31.3" (795mm) of precipitation.
When does it snow?
Months with snowfall are January through April, October through December.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 12.6 days and typically aggregates up to 4.53" (115mm) of snow.
How much does it snow?
In Flossmoor, during the entire year, snow falls for 44.6 days and aggregates up to 16.46" (418mm) of snow.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 3.6h 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 month with the most rainfall is May, when the rain falls for 17.4 days and typically aggregates up to 4.17" (106mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the month with the highest UV index?
June and July, with an average maximum UV index of 6, are months with the highest UV index.
What month is the hottest?
July proves to be the warmest month, recording an average peak temperature of 81.3°F (27.4°C) and a minimum temperature of 65.8°F (18.8°C).
What month has the most sunshine?
August has the most sunshine of the year, with an average of 10.1h of sunshine.
What is the least humid month?
With an average relative humidity of 73%, October is the least humid month.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 7.9 days and typically collects 1.54" (39mm) of precipitation.
What is the month with the shortest days?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
When is the lowest UV index?
December is the month with the lowest UV index, with an average maximum UV index of 1.
Average temperature
Flossmoor, IL
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.7°F).
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (18.9°F).
Average pressure
Flossmoor, 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:
30.1"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
Flossmoor, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.3mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.5mph
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
Flossmoor, IL
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Flossmoor, IL
- Average rainfall in January:
1.77" - Average rainfall in February:
1.69" - Average rainfall in March:
2.09" - Average rainfall in April:
3.43" - Average rainfall in May:
4.17" - Average rainfall in June:
3.82"
- Average rainfall in July:
3.31" - Average rainfall in August:
2.56" - Average rainfall in September:
2.48" - Average rainfall in October:
2.76" - Average rainfall in November:
1.69" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is May (4.17").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days
Flossmoor, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
12.7 days - Average rainfall days in April:
16.8 days - Average rainfall days in May:
17.4 days - Average rainfall days in June:
17.4 days
- Average rainfall days in July:
17.6 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
13.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
10.4 days - Average rainfall days in December:
7.9 days
The month with the highest number of rainy days is July (17.6 days).
The month with the least rainy days is February (6.1 days).
Average snowfall
Flossmoor, IL
The month with the highest snowfall is January (4.53").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Flossmoor, IL
- Average snowfall days in January:
12.6 days - Average snowfall days in February:
10.5 days - Average snowfall days in March:
6.1 days - Average snowfall days in April:
1.9 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:
0.3 days - Average snowfall days in November:
4 days - Average snowfall days in December:
9.1 days
The month with the highest number of snowfall days is January (12.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Flossmoor, 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 3min - 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 6min).
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 4min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Flossmoor, IL
- Average sunshine days in January:
13 days - Average sunshine days in February:
11.8 days - Average sunshine days in March:
13.8 days - Average sunshine days in April:
10.2 days - Average sunshine days in May:
11.8 days - Average sunshine days in June:
10.4 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
13.3 days - Average sunshine days in September:
14 days - Average sunshine days in October:
14.4 days - Average sunshine days in November:
16.4 days - Average sunshine days in December:
15 days
The month with the most sunshine days is November (16.4 days).
The month with the least sunshine days is April (10.2 days).
Average UV index
Flossmoor, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Flossmoor, IL
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility
Flossmoor, IL
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Flossmoor, Illinois, USA
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