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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 Darien, Illinois, with an average temperature varying between 28.8°F (-1.8°C) and 17.1°F (-8.3°C). January stands out as Darien's coldest month, with temperatures ranging between an average high of 28.8°F (-1.8°C) and a low of 17.1°F (-8.3°C). Weather in January »
Weather in February
February, the last month of the winter in Darien, is a cold month, with an average temperature fluctuating between 32.5°F (0.3°C) and 19.9°F (-6.7°C). The commencement of February brings an average high-temperature of a cold 32.5°F (0.3°C), marking an inconsequential divergence from January. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Darien, Illinois, with an average temperature ranging between max 45.1°F (7.3°C) and min 31.5°F (-0.3°C). In Darien, the average high-temperature in March increases 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 in Darien, Illinois, is a refreshing spring month, with an average temperature varying between 56.5°F (13.6°C) and 40.6°F (4.8°C). A shift in the average high-temperature is noticeable in April, changing from a frosty 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 Darien, Illinois, with an average temperature varying between 52.2°F (11.2°C) and 68.9°F (20.5°C). Darien's weather in May shows a rise in the average high-temperature, moving up 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 Darien, is a moderately hot month, with an average temperature varying between 61.7°F (16.5°C) and 78.3°F (25.7°C). A shift in the average high-temperature is noticeable in June, changing from a pleasant 68.9°F (20.5°C) in May to a warm 78.3°F (25.7°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Darien, Illinois, with an average temperature varying between 66.4°F (19.1°C) and 82.4°F (28°C). July is the month when Darien experiences its warmest temperatures, averaging a high of 82.4°F (28°C) and a low of 66.4°F (19.1°C). The heat index value during July is estimated at a tropical 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Darien, Illinois, 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). August commences with an average high-temperature of a still moderately hot 81.1°F (27.3°C), showing little deviation from July's 82.4°F (28°C). Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Darien, Illinois, with an average temperature varying between 57.9°F (14.4°C) and 74.3°F (23.5°C). The transition into September subtly indicates a reduction in the average high-temperature, down to a still warm 74.3°F (23.5°C) from August's moderately hot 81.1°F (27.3°C). Weather in September »
Weather in October
October, the same as September, in Darien, 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). The transition into October involves a decrease in the average high-temperature, falling from a warm 74.3°F (23.5°C) in September to a mild 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 Darien, Illinois, with an average temperature fluctuating between 45.7°F (7.6°C) and 33.6°F (0.9°C). As October transitions into November, Darien sees a clear drop in the average high-temperature, declining from a moderate 60.6°F (15.9°C) to a frosty 45.7°F (7.6°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Darien, Illinois, with an average temperature fluctuating between 25°F (-3.9°C) and 34.5°F (1.4°C). Onset of December witnesses a reduction in the average high-temperature, falling 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 6, 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, recording an average high temperature of 28.8°F (-1.8°C) and a low temperature of 17.1°F (-8.3°C), is Darien's coldest month.
What is the most humid month?
January and February, with an average relative humidity of 82%, are most humid months.
How much does it rain in Darien?
In Darien, during the entire year, the rain falls for 118.5 days and collects up to 13.74" (349mm) of precipitation.
When does it snow?
January through April, October through December are months with snowfall.
How much does it snow in Darien?
In Darien, 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?
The month with the lowest UV index is January, with an average maximum UV index of 1.
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 wettest month?
May is the month with the most rainfall. Rain falls for 14.9 days and accumulates 1.97" (50mm) of precipitation.
When it does not snow?
In Darien, snow does not fall in May through September.
When are the longest days?
The month with the longest days is June, with an average of 15h and 12min of daylight.
What is the month with 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 is the warmest month, with an average high-temperature of 82.4°F (28°C) and an average low-temperature of 66.4°F (19.1°C).
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 72%.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 4.9 days and typically collects 0.63" (16mm) 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.
Average temperature
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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
Darien, 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).
Darien, Illinois, USA
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