Climate and monthly weather forecastGlen Ellyn, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Glen Ellyn, Illinois, is a freezing cold winter month, with temperature in the range of an average high of 28°F (-2.2°C) and an average low of 16.7°F (-8.5°C). The coldest temperatures occur during January, when averages reach a peak of 28°F (-2.2°C) and a low of 16.7°F (-8.5°C). Weather in January »Weather in February
The last month of the winter, February, is a cold month in Glen Ellyn, Illinois, with an average temperature varying between 32.2°F (0.1°C) and 19.8°F (-6.8°C). As January turns into February, the average high-temperatures rest at an icy 32.2°F (0.1°C), showing a minor variation from the prior month. Weather in February »Weather in March
March, the first month of the spring in Glen Ellyn, is a chilly month, with an average temperature fluctuating between 45°F (7.2°C) and 30.7°F (-0.7°C). The onset of March brings a temperature shift, with the average high-temperature moving from an icy 32.2°F (0.1°C) in February to a chilly 45°F (7.2°C). Weather in March »Weather in April
April in Glen Ellyn, Illinois, is a mild spring month, with an average temperature varying between 40.3°F (4.6°C) and 56.3°F (13.5°C). As Glen Ellyn, Illinois, transitions into April, a rise in the average high-temperature is observed, moving from a frosty 45°F (7.2°C) in March to a refreshing 56.3°F (13.5°C). Weather in April »Weather in May
May, the last month of the spring in Glen Ellyn, is an agreeable month, with an average temperature ranging between max 68.5°F (20.3°C) and min 51.8°F (11°C). The commencement of May sees a shift in the average high-temperature, moving from a mild 56.3°F (13.5°C) in April to a pleasant 68.5°F (20.3°C). Weather in May »Weather in June
The first month of the summer, June, is a moderately hot month in Glen Ellyn, Illinois, with temperature in the range of an average low of 60.8°F (16°C) and an average high of 78.1°F (25.6°C). June shows a rise in the average high-temperature, moving from May's pleasant 68.5°F (20.3°C) to a warm 78.1°F (25.6°C). Weather in June »Weather in July
July, the same as June, is another warm summer month in Glen Ellyn, Illinois, with temperature in the range of an average high of 81.7°F (27.6°C) and an average low of 65.3°F (18.5°C). July, characterized by an average high temperature of 81.7°F (27.6°C) and a low temperature of 65.3°F (18.5°C), is generally the warmest month. The heat index value during July 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 Glen Ellyn, Illinois, with an average temperature varying between 80.4°F (26.9°C) and 64°F (17.8°C). Glen Ellyn signifies an average high-temperature of a still warm 80.4°F (26.9°C) in August, closely mirroring the 81.7°F (27.6°C) of July. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in Glen Ellyn, Illinois, with an average temperature fluctuating between 57.4°F (14.1°C) and 73.6°F (23.1°C). September ushers in a minor alteration in Glen Ellyn's climate, with the average high-temperature moving from August's 80.4°F (26.9°C) to a still warm 73.6°F (23.1°C). Weather in September »Weather in October
October, like September, is another refreshing autumn month in Glen Ellyn, Illinois, with an average temperature fluctuating between 45.5°F (7.5°C) and 60.4°F (15.8°C). The transition into October involves a decrease in the average high-temperature, falling from a moderately hot 73.6°F (23.1°C) in September to a mild 60.4°F (15.8°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Glen Ellyn, Illinois, with an average temperature varying between 45.5°F (7.5°C) and 33.3°F (0.7°C). Glen Ellyn's transition into November is marked by a distinct drop in the average high-temperature, reducing from a moderate 60.4°F (15.8°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 Glen Ellyn, is still a cold month, with an average temperature fluctuating between 34.3°F (1.3°C) and 24.3°F (-4.3°C). Onset of December witnesses a reduction in the average high-temperature, falling from a frosty 45.5°F (7.5°C) in November to an icy 34.3°F (1.3°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
The coldest temperatures in Glen Ellyn occur during January, when averages reach a peak of 28°F (-2.2°C) and a low of 16.7°F (-8.5°C).
The months with the highest humidity in Glen Ellyn, Illinois, are January and February, with an average relative humidity of 83%.
In Glen Ellyn, Illinois, during the entire year, the rain falls for 164.3 days and collects up to 33.78" (858mm) of precipitation.
January through May, October through December are months with snowfall in Glen Ellyn, Illinois.
The month with the most snowfall is January, when snow falls for 13.1 days and typically aggregates up to 5.87" (149mm) of snow.
Throughout the year, in Glen Ellyn, there are 47 snowfall days, and 20.2" (513mm) of snow is accumulated.
January has the least sunshine of the year in Glen Ellyn, with an average of 3.7h of sunshine.
January is the month with the lowest UV index, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Glen Ellyn, 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 in Glen Ellyn, Illinois. Rain falls for 19.2 days and accumulates 4.45" (113mm) of precipitation.
In Glen Ellyn, snow does not fall in June through September.
June has the longest days of the year, with an average of 15h and 12min of daylight.
The months with the highest UV index are June through August, with an average maximum UV index of 6.
The month of July sees the average highest temperatures, reaching 81.7°F (27.6°C) at the peak and 65.3°F (18.5°C) at the low.
August has the most sunshine of the year in Glen Ellyn, with an average of 9.9h of sunshine.
October is the least humid month in Glen Ellyn, with an average relative humidity of 73%.
November and December are months with the least rain in Glen Ellyn when the rain falls for 10.2 days and typically aggregates up to 1.65" (42mm) of rain.
The month with the shortest days in Glen Ellyn, Illinois, is December, with an average of 9h and 12min of daylight.
Average temperature
Glen Ellyn, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure
Glen Ellyn, 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:
30.09"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
Glen Ellyn, IL
- Average wind speed in January:
9.8mph - Average wind speed in February:
9.6mph - Average wind speed in March:
9.3mph - Average wind speed in April:
9.6mph - Average wind speed in May:
8.1mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6mph - Average wind speed in September:
7mph - Average wind speed in October:
8.7mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
Glen Ellyn, IL
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall
Glen Ellyn, IL
- Average rainfall in January:
1.81" - Average rainfall in February:
1.81" - Average rainfall in March:
1.97" - Average rainfall in April:
3.78" - Average rainfall in May:
4.45" - Average rainfall in June:
4.29"
- Average rainfall in July:
3.7" - Average rainfall in August:
3.35" - Average rainfall in September:
2.48" - Average rainfall in October:
2.83" - Average rainfall in November:
1.65" - Average rainfall in December:
1.65"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").
Average rainfall days
Glen Ellyn, IL
- Average rainfall days in January:
6.4 days - Average rainfall days in February:
5.8 days - Average rainfall days in March:
12.1 days - Average rainfall days in April:
17 days - Average rainfall days in May:
19.2 days - Average rainfall days in June:
19.3 days
- Average rainfall days in July:
20.1 days - Average rainfall days in August:
17.9 days - Average rainfall days in September:
14.6 days - Average rainfall days in October:
13.9 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
7.8 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).
Average snowfall
Glen Ellyn, IL
- Average snowfall in January:
5.87" - Average snowfall in February:
5.12" - Average snowfall in March:
1.54" - Average snowfall in April:
2.6" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Glen Ellyn, IL
- Average snowfall days in January:
13.1 days - Average snowfall days in February:
11.5 days - Average snowfall days in March:
6.3 days - Average snowfall days in April:
1.8 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:
0.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
9.7 days
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
Glen Ellyn, IL
- Average daylight in January:
9h and 30min - 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 36min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 36min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
9h and 54min - Average sunshine in September:
8h and 48min - Average sunshine in October:
5h and 36min - Average sunshine in November:
5h and 6min - Average sunshine in December:
4h and 6min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Glen Ellyn, IL
- Average sunshine days in January:
14.3 days - Average sunshine days in February:
12.2 days - Average sunshine days in March:
14.3 days - Average sunshine days in April:
9.4 days - Average sunshine days in May:
9.4 days - Average sunshine days in June:
8.4 days
- Average sunshine days in July:
8.2 days - Average sunshine days in August:
9.3 days - Average sunshine days in September:
12.3 days - Average sunshine days in October:
13.8 days - Average sunshine days in November:
16.1 days - Average sunshine days in December:
15.7 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).
Average UV index
Glen Ellyn, 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
Glen Ellyn, IL
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility
Glen Ellyn, 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).
