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, in Charleston, Illinois, is another cold winter month, with temperature in the range of an average high of 34°F (1.1°C) and an average low of 21.9°F (-5.6°C). January is the coldest month, 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 temperature in the range of an average high of 39°F (3.9°C) and an average low of 26.1°F (-3.3°C). In Charleston, the average high-temperature in February is essentially the same as in January - a still cold 39°F (3.9°C). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Charleston, Illinois, with an average temperature fluctuating between 51.1°F (10.6°C) and 36.1°F (2.3°C). In Charleston, the average high-temperature in March rises from a wintry 39°F (3.9°C) in February to a fresh 51.1°F (10.6°C). Weather in March »
Weather in April
April is a comfortable spring month in Charleston, Illinois, with an average temperature varying between 46.2°F (7.9°C) and 62.2°F (16.8°C). In April, the average high-temperature increases from a cool 51.1°F (10.6°C) in March to an enjoyable 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 an average temperature fluctuating between 56.7°F (13.7°C) and 73°F (22.8°C). In May, the average high-temperature rises from a comfortable 62.2°F (16.8°C) in April to a pleasant 73°F (22.8°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Charleston, Illinois, with an average temperature varying between 81.1°F (27.3°C) and 64.2°F (17.9°C). In June, the average high-temperature slightly increases from a pleasant 73°F (22.8°C) in May to a moderately hot 81.1°F (27.3°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Charleston, Illinois, with an average temperature fluctuating between 82°F (27.8°C) and 65.8°F (18.8°C). July is the warmest month, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 65.8°F (18.8°C). In July, the average heat index is estimated at a hot 89.6°F (32°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Charleston, Illinois, with an average temperature fluctuating between 64°F (17.8°C) and 81.1°F (27.3°C). In Charleston, Illinois, the average high-temperature in August is practically the same as in July - a still warm 81.1°F (27.3°C). Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Charleston, Illinois, with an average temperature varying between 58.5°F (14.7°C) and 77.2°F (25.1°C). In Charleston, the average high-temperature in September is practically the same as in August - a still moderately hot 77.2°F (25.1°C). Weather in September »
Weather in October
October, the same as September, is another enjoyable autumn month in Charleston, Illinois, with an average temperature ranging between min 48.2°F (9°C) and max 63.9°F (17.7°C). In Charleston, Illinois, the average high-temperature in October drops from a moderately hot 77.2°F (25.1°C) in September 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 another chilly month, with temperature in the range of an average low of 36.1°F (2.3°C) and an average high of 49.8°F (9.9°C). In November, the average high-temperature drops from a comfortable 63.9°F (17.7°C) in October to a chilly 49.8°F (9.9°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Charleston, Illinois, with an average temperature varying between 39°F (3.9°C) and 28.8°F (-1.8°C). In Charleston, the average high-temperature in December decreases from a chilly 49.8°F (9.9°C) in November to a wintry 39°F (3.9°C). Weather in December »
[Resources]FAQ
What is the coldest month in Charleston?
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).
How many days does it rain in Charleston?
In Charleston, 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 in Charleston, Illinois, are January through April, October through December.
How much does it snow in Charleston?
In Charleston, during the entire year, snow falls for 26.6 days and aggregates up to 7.01" (178mm) of snow.
What is the month with the least sunshine in Charleston?
The month with the least sunshine in Charleston, Illinois, is January, with an average of 4h of sunshine.
What is the driest month in Charleston?
February is the month with the least rainfall in Charleston. Rain falls for 7.8 days and accumulates 1.3" (33mm) of precipitation.
When is Daylight Saving Time (DST) in Charleston?
On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts, and the time zone changes from CST to CDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from CDT to CST.
What is the rainiest month in Charleston?
The month with the most rainfall is April, when the rain falls for 14.9 days and typically aggregates up to 3.31" (84mm) of precipitation.
When it does not snow in Charleston?
In Charleston, Illinois, snow does not fall in May through September.
When are the longest days in Charleston?
The month with the longest days in Charleston, Illinois, is June, with an average of 14h and 55min of daylight.
What month has the most sunshine in Charleston?
With an average of 10.3h of sunshine, June has the most sunshine of the year.
What are the months with the highest UV index in Charleston?
June through August, with an average maximum UV index of 6, are months with the highest UV index in Charleston, Illinois.
What is the warmest month in Charleston?
July is the warmest month, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 65.8°F (18.8°C).
What is the most humid month in Charleston?
With an average relative humidity of 83%, July is the most humid month.
What is the least humid month in Charleston?
October is the least humid month in Charleston, 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?
December has the shortest days of the year in Charleston, with an average of 9h and 26min 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 in Charleston, Illinois.
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).
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