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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 Chester, Illinois, with an average temperature varying between 39.6°F (4.2°C) and 25.7°F (-3.5°C). January is Chester's coldest month, registering average high temperatures of 39.6°F (4.2°C) and lows of 25.7°F (-3.5°C). Weather in January »
Weather in February
The last month of the winter, February, is a chilly month in Chester, Illinois, with an average temperature ranging between min 29.1°F (-1.6°C) and max 43.7°F (6.5°C). The advent of February sees the average high-temperature at a frosty 43.7°F (6.5°C), subtly shifted from January's 39.6°F (4.2°C). Weather in February »
Weather in March
March, the first month of the spring in Chester, is a moderate month, with an average temperature varying between 55.4°F (13°C) and 38.8°F (3.8°C). With the transition into March, Chester experiences an increase in average high-temperatures, moving up from a frosty 43.7°F (6.5°C) in February to a moderate 55.4°F (13°C). Weather in March »
Weather in April
April in Chester, Illinois, is a refreshing spring month, with an average temperature varying between 48°F (8.9°C) and 66.4°F (19.1°C). The arrival of April brings an increase in high-temperatures, moving from a moderate 55.4°F (13°C) in March to a still refreshing 66.4°F (19.1°C). Weather in April »
Weather in May
May, the last month of the spring in Chester, is a warm month, with an average temperature fluctuating between 57.9°F (14.4°C) and 75.7°F (24.3°C). As April transitions into May, Chester sees a rise in the average high-temperature, moving from a comfortable 66.4°F (19.1°C) to a warm 75.7°F (24.3°C). Weather in May »
Weather in June
June, the first month of the summer in Chester, is still a warm month, with temperature in the range of an average high of 85.1°F (29.5°C) and an average low of 66.6°F (19.2°C). The shift into June is characterized by a rise in the average high-temperature, transitioning from May's 75.7°F (24.3°C) to a still moderately hot 85.1°F (29.5°C). Weather in June »
Weather in July
July in Chester, Illinois, is a hot summer month, with an average temperature varying between 68.5°F (20.3°C) and 87.4°F (30.8°C). July stands out as Chester's warmest month, with temperatures ranging between an average high of 87.4°F (30.8°C) and a low of 68.5°F (20.3°C). July's mean heat index is calculated to be a torrid 102.2°F (39°C). Weather in July »
Weather in August
August, the last month of the summer in Chester, is another warm month, with an average temperature fluctuating between 85.8°F (29.9°C) and 66.2°F (19°C). Chester's average high-temperature in August sits at a moderately hot 85.8°F (29.9°C), showing little difference from the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Chester, is still a warm month, with an average temperature ranging between max 79.9°F (26.6°C) and min 60.1°F (15.6°C). Chester experiences a moderate temperature shift at the start of September, with average high-temperatures adjusting a bit from a warm 85.8°F (29.9°C) in August to a still moderately hot 79.9°F (26.6°C). Weather in September »
Weather in October
October, like September, in Chester, Illinois, is another enjoyable autumn month, with an average temperature fluctuating between 67.1°F (19.5°C) and 49.1°F (9.5°C). Observing a mild shift, the average high-temperature during October reduces from September's moderately hot 79.9°F (26.6°C) to an enjoyable 67.1°F (19.5°C). Weather in October »
Weather in November
November, the last month of the autumn in Chester, is another cool month, with an average temperature ranging between max 53.8°F (12.1°C) and min 38.7°F (3.7°C). As October transitions to November, the average high-temperature falls from an enjoyable 67.1°F (19.5°C) to a cool 53.8°F (12.1°C). Weather in November »
Weather in December
December, the first month of the winter in Chester, is still a chilly month, with temperature in the range of an average high of 43.7°F (6.5°C) and an average low of 31.1°F (-0.5°C). With the onset of December, Chester experiences a modest temperature adjustment, with the average high-temperature receding from a cool 53.8°F (12.1°C) in November to a chilly 43.7°F (6.5°C). Weather in December »
[Resources]Frequently asked questions
What time of the year is the coldest in Chester?
Chester's coldest month, January, registers temperatures that range from a high of 39.6°F (4.2°C) to a low of 25.7°F (-3.5°C).
How much does it rain in Chester?
In Chester, during the entire year, the rain falls for 156.4 days and collects up to 34.25" (870mm) of precipitation.
When does it snow in Chester?
January through April, October through December are months with snowfall in Chester.
How many days does it snow in Chester?
Throughout the year, there are 16 snowfall days, and 6.89" (175mm) of snow is accumulated.
What is the month with the least sunshine in Chester?
With an average of 4.7h of sunshine, January has the least sunshine of the year.
What is the month with the lowest UV index in Chester?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index in Chester, Illinois.
What is the snowiest month in Chester?
February is the month with the most snowfall in Chester. Snow falls for 5.2 days and accumulates 2.56" (65mm) of snow.
When is Daylight Saving Time (DST) in Chester?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Chester, 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 in Chester?
The month with the most rainfall is April, when the rain falls for 15.6 days and typically aggregates up to 4.13" (105mm) of precipitation.
What is the most humid month in Chester?
May is the most humid month, with an average relative humidity of 79%.
When it does not snow in Chester?
In Chester, snow does not fall in May through September.
When is the highest UV index in Chester?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days in Chester?
With an average of 14h and 48min of daylight, June has the longest days of the year in Chester, Illinois.
What are the months with the most sunshine in Chester?
June and July, with an average of 10.5h of sunshine, are months with the most sunshine in Chester, Illinois.
What time of the year is the hottest in Chester?
With an average high-temperature of 87.4°F (30.8°C) and an average low-temperature of 68.5°F (20.3°C), July is the warmest month in Chester, Illinois.
What is the driest month in Chester?
The month with the least rainfall in Chester, Illinois, is September, when the rain falls for 13 days and typically collects 1.97" (50mm) of precipitation.
What is the least humid month in Chester?
With an average relative humidity of 71%, October is the least humid month in Chester.
What is the month with the shortest days in Chester?
December has the shortest days of the year, with an average of 9h and 36min of daylight.
Average temperature
Chester, IL
The warmest month (with the highest average high temperature) is July (87.4°F).
The month with the lowest average high temperature is January (39.6°F).
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure
Chester, IL
- Average pressure in January:
30.16"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"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:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.04"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.14"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed
Chester, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.2mph - Average wind speed in March:
9.1mph - Average wind speed in April:
8.9mph - Average wind speed in May:
7.4mph - Average wind speed in June:
6.4mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.5mph - Average wind speed in September:
6mph - Average wind speed in October:
7.7mph - Average wind speed in November:
8.4mph - Average wind speed in December:
8.6mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).
Average humidity
Chester, IL
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Chester, IL
- Average rainfall in January:
2.13" - Average rainfall in February:
2.01" - Average rainfall in March:
2.95" - Average rainfall in April:
4.13" - Average rainfall in May:
3.86" - Average rainfall in June:
3.27"
- Average rainfall in July:
3.19" - Average rainfall in August:
3.19" - Average rainfall in September:
1.97" - Average rainfall in October:
2.87" - Average rainfall in November:
2.28" - Average rainfall in December:
2.4"
The wettest month (with the highest rainfall) is April (4.13").
The driest month (with the least rainfall) is September (1.97").
Average rainfall days
Chester, IL
- Average rainfall days in January:
7.9 days - Average rainfall days in February:
9.3 days - Average rainfall days in March:
15.1 days - Average rainfall days in April:
15.6 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
15.7 days
- Average rainfall days in July:
17.8 days - Average rainfall days in August:
14.9 days - Average rainfall days in September:
13 days - Average rainfall days in October:
10.5 days - Average rainfall days in November:
10.2 days - Average rainfall days in December:
9.1 days
The month with the highest number of rainy days is July (17.8 days).
The month with the least rainy days is January (7.9 days).
Average snowfall
Chester, IL
The month with the highest snowfall is February (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Chester, IL
- Average snowfall days in January:
4.8 days - Average snowfall days in February:
5.2 days - Average snowfall days in March:
1.3 days - Average snowfall days in April:
0.3 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:
1.3 days - Average snowfall days in December:
3 days
The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Chester, IL
- Average daylight in January:
9h and 5min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 5min
- Average daylight in July:
14h and 3min - 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 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in January:
4h and 4min - Average sunshine in February:
4h and 5min - Average sunshine in March:
6h and 3min - Average sunshine in April:
8h and 4min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 3min
- Average sunshine in July:
10h and 3min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 2min - Average sunshine in October:
6h and 2min - Average sunshine in November:
5h and 4min - Average sunshine in December:
5h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).
Average sunshine days
Chester, IL
- Average sunshine days in January:
18.8 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
13.6 days - Average sunshine days in April:
12.6 days - Average sunshine days in May:
11.3 days - Average sunshine days in June:
12 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
13 days - Average sunshine days in September:
15.4 days - Average sunshine days in October:
18.9 days - Average sunshine days in November:
18.5 days - Average sunshine days in December:
18.7 days
The month with the most sunshine days is October (18.9 days).
The month with the least sunshine days is July (9.8 days).
Average UV index
Chester, IL
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover
Chester, IL
The months with the most cloud cover are January and February (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility
Chester, 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).
Chester, Illinois, USA
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