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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, the same as December, is a wintry winter month in Charleston, Illinois, with an average temperature varying between 34°F (1.1°C) and 21.9°F (-5.6°C). The coldest month is January, with an average high-temperature of 34°F (1.1°C) and an average low-temperature of 21.9°F (-5.6°C). Weather in January »
Weather in February
February, the last month of the winter in Charleston, is also a wintry month, with an average temperature varying between 26.1°F (-3.3°C) and 39°F (3.9°C). The advent of February signifies a minor shift to an average high-temperature of a still wintry 39°F (3.9°C), aligning closely with January. Weather in February »
Weather in March
March, the first month of the spring in Charleston, is a fresh month, with an average temperature fluctuating between 51.1°F (10.6°C) and 36.1°F (2.3°C). With the onset of March, the average high-temperature slightly shifts from February's icy 39°F (3.9°C) to a cool 51.1°F (10.6°C). Weather in March »
Weather in April
April is a refreshing spring month in Charleston, Illinois, with an average temperature varying between 62.2°F (16.8°C) and 46.2°F (7.9°C). Charleston's April weather brings a rise in high-temperatures, moving from a fresh 51.1°F (10.6°C) in March to a refreshing 62.2°F (16.8°C). Weather in April »
Weather in May
May, the last month of the spring in Charleston, is an agreeable month, with temperature in the range of an average high of 73°F (22.8°C) and an average low of 56.7°F (13.7°C). Charleston's weather in May presents a rise in the average high-temperature, moving from a comfortable 62.2°F (16.8°C) in April to an agreeable 73°F (22.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Charleston, Illinois, with temperature in the range of an average low of 64.2°F (17.9°C) and an average high of 81.1°F (27.3°C). The beginning of June marks a minor shift in the average high-temperature, moving from May's pleasant 73°F (22.8°C) to a moderately hot 81.1°F (27.3°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Charleston, Illinois, with an average temperature ranging between min 65.8°F (18.8°C) and max 82°F (27.8°C). July, characterized by an average high temperature of 82°F (27.8°C) and a low temperature of 65.8°F (18.8°C), is generally the warmest month. The heat index value during July is evaluated at a tropical 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Charleston, is also a moderately hot month, with temperature in the range of an average low of 64°F (17.8°C) and an average high of 81.1°F (27.3°C). Charleston registers an average high-temperature of a still moderately hot 81.1°F (27.3°C) at the commencement of August, closely related to the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Charleston, is still a warm month, with an average temperature varying between 58.5°F (14.7°C) and 77.2°F (25.1°C). Charleston records an average high-temperature of a still warm 77.2°F (25.1°C) as September arrives, nearly mirroring the previous month's climate. Weather in September »
Weather in October
October, like September, in Charleston, Illinois, is another enjoyable autumn month, with temperature in the range of an average low of 48.2°F (9°C) and an average high of 63.9°F (17.7°C). Charleston in October undergoes a mild reduction in the average high-temperature, shifting from September's warm 77.2°F (25.1°C) to a comfortable 63.9°F (17.7°C). Weather in October »
Weather in November
November, the last month of the autumn in Charleston, is also a frosty month, with an average temperature varying between 49.8°F (9.9°C) and 36.1°F (2.3°C). November involves a decrease in temperature, down from an enjoyable 63.9°F (17.7°C) in October to a chilly 49.8°F (9.9°C). Weather in November »
Weather in December
December, the first month of the winter in Charleston, is still a cold month, with an average temperature fluctuating between 39°F (3.9°C) and 28.8°F (-1.8°C). As Charleston enters December, the average high-temperature decreases from the a frosty 49.8°F (9.9°C) of November to a wintry 39°F (3.9°C). Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Charleston?
Charleston's January weather, marked by an average high temperature of 34°F (1.1°C) and an average low temperature of 21.9°F (-5.6°C), is the coldest in the year.
How many days does it rain in Charleston?
In Charleston, Illinois, during the entire year, the rain falls for 148 days and collects up to 25.63" (651mm) of precipitation.
When does it snow in Charleston?
Months with snowfall are January through April, October through December.
How much does it snow in Charleston?
Throughout the year, there are 26.6 snowfall days, and 7.01" (178mm) of snow is accumulated.
What is the month with the least sunshine in Charleston?
The month with the least sunshine is January, with an average of 4h of sunshine.
What is the driest month in Charleston?
February is the month with the least rainfall. Rain falls for 7.8 days and accumulates 1.3" (33mm) of precipitation.
When is Daylight Saving Time (DST) in Charleston?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Charleston, 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 rainiest month in Charleston?
April is the month with the most rainfall. Rain falls for 14.9 days and accumulates 3.31" (84mm) of precipitation.
When it does not snow in Charleston?
May through September are months without snowfall in Charleston.
When are the longest days in Charleston?
The month with the longest days is June, with an average of 14h and 54min of daylight.
What month has the most sunshine in Charleston?
June has the most sunshine of the year, with an average of 10.3h of sunshine.
When is the highest UV index in Charleston?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What part of the year is the hottest in Charleston?
With average temperatures fluctuating between a high of 82°F (27.8°C) and a low of 65.8°F (18.8°C), July stands out as the warmest month in Charleston, Illinois.
What is the most humid month in Charleston?
July is the most humid month, with an average relative humidity of 83%.
What is the least humid month in Charleston?
The least humid month in Charleston is October, with an average relative humidity of 70%.
What is the snowiest month in Charleston?
December is the month with the most snowfall in Charleston. Snow falls for 6 days and accumulates 2.13" (54mm) of snow.
What is the month with the shortest days in Charleston?
The month with the shortest days in Charleston is December, with an average of 9h and 24min of daylight.
When is the lowest UV index in Charleston?
With an average maximum UV index of 1, December is the month with the lowest UV index.
Average temperature
Charleston, IL
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (34°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 (21.9°F).
Average pressure
Charleston, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.95"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.93"Hg
- Average pressure in July:
29.98"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Charleston, IL
- Average wind speed in January:
10.7mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6.3mph - Average wind speed in September:
7.1mph - Average wind speed in October:
9.2mph - Average wind speed in November:
9.9mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest month (with the lowest average wind speed) is July (6.2mph).
Average humidity
Charleston, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (70%).
Average rainfall
Charleston, IL
- Average rainfall in January:
1.81" - Average rainfall in February:
1.3" - Average rainfall in March:
2.09" - Average rainfall in April:
3.31" - Average rainfall in May:
2.87" - Average rainfall in June:
2.76"
- Average rainfall in July:
2.52" - Average rainfall in August:
2.28" - Average rainfall in September:
1.38" - Average rainfall in October:
2.13" - Average rainfall in November:
1.61" - Average rainfall in December:
1.57"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is February (1.3").
Average rainfall days
Charleston, IL
- Average rainfall days in January:
8.2 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
12.5 days - Average rainfall days in April:
14.9 days - Average rainfall days in May:
16.8 days - Average rainfall days in June:
15.6 days
- Average rainfall days in July:
16.6 days - Average rainfall days in August:
14.3 days - Average rainfall days in September:
12.1 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
8.7 days - Average rainfall days in December:
9.4 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is February (7.8 days).
Average snowfall
Charleston, IL
The month with the highest snowfall is December (2.13").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Charleston, IL
- Average snowfall days in January:
8.1 days - Average snowfall days in February:
6.8 days - Average snowfall days in March:
3.2 days - Average snowfall days in April:
0.7 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:
0.1 days - Average snowfall days in November:
1.7 days - Average snowfall days in December:
6 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Charleston, IL
- Average daylight in January:
9h and 5min - 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 2min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 4min - Average daylight in August:
13h and 4min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 1min - Average daylight in November:
10h and 0min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 0min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
8h and 5min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Charleston, IL
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
14 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
12.9 days - Average sunshine days in May:
11.2 days - Average sunshine days in June:
11.5 days
- Average sunshine days in July:
10.6 days - Average sunshine days in August:
12.7 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
18.3 days - Average sunshine days in November:
17.9 days - Average sunshine days in December:
16.9 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is July (10.6 days).
Average UV index
Charleston, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover
Charleston, IL
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility
Charleston, IL
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Charleston, Illinois, USA
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