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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 another cold winter month in Chesterfield, Illinois, with an average temperature ranging between min 22.5°F (-5.3°C) and max 34.9°F (1.6°C). In Chesterfield, the lowest average temperatures are observed in January, with a high of 34.9°F (1.6°C) and a low of 22.5°F (-5.3°C). Weather in January »
Weather in February
February, the last month of the winter in Chesterfield, is another cold month, with an average temperature fluctuating between 26.1°F (-3.3°C) and 39.4°F (4.1°C). Chesterfield marks the arrival of February with an average high-temperature of a still cold 39.4°F (4.1°C), hardly different from January's 34.9°F (1.6°C). Weather in February »
Weather in March
The first month of the spring, March, is a fresh month in Chesterfield, Illinois, with an average temperature varying between 52.2°F (11.2°C) and 36.5°F (2.5°C). A shift in the average high-temperature is noticeable in March, changing from a cold 39.4°F (4.1°C) in February to a fresh 52.2°F (11.2°C). Weather in March »
Weather in April
April in Chesterfield, Illinois, is a comfortable spring month, with an average temperature varying between 46.4°F (8°C) and 63.9°F (17.7°C). The beginning of April marks a shift in the average high-temperature, moving from March's fresh 52.2°F (11.2°C) to a comfortable 63.9°F (17.7°C). Weather in April »
Weather in May
May, the last month of the spring in Chesterfield, is a warm month, with an average temperature ranging between min 56.8°F (13.8°C) and max 73.6°F (23.1°C). May's arrival coincides with a rise in the average high-temperature, moving from April's refreshing 63.9°F (17.7°C) to a warm 73.6°F (23.1°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Chesterfield, Illinois, with temperature in the range of an average low of 65.1°F (18.4°C) and an average high of 81.9°F (27.7°C). As Chesterfield welcomes June, the average high-temperature displays a subtle shift, adjusting from 73.6°F (23.1°C) in May to a still warm 81.9°F (27.7°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Chesterfield, Illinois, with temperature in the range of an average high of 83.8°F (28.8°C) and an average low of 66.9°F (19.4°C). July, characterized by an average high temperature of 83.8°F (28.8°C) and a low temperature of 66.9°F (19.4°C), is generally the warmest month. In July, the heat index is evaluated at a very hot 95°F (35°C). Weather in July »
Weather in August
August, the last month of the summer in Chesterfield, is also a moderately hot month, with an average temperature varying between 64.9°F (18.3°C) and 82.6°F (28.1°C). Chesterfield experiences an average high-temperature of a still warm 82.6°F (28.1°C) in August, marking an insignificant shift from 83.8°F (28.8°C) in July. Weather in August »
Weather in September
The first month of the autumn, September, is still a warm month in Chesterfield, Illinois, with an average temperature fluctuating between 77.9°F (25.5°C) and 59.4°F (15.2°C). Chesterfield's shift from August to September is accompanied by an average high-temperature of a still warm 77.9°F (25.5°C), a slight deviation from 82.6°F (28.1°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Chesterfield, Illinois, with an average temperature fluctuating between 64.8°F (18.2°C) and 48.2°F (9°C). The onset of October entails a temperature shift, as the average high-temperature decreases from a moderately hot 77.9°F (25.5°C) in September to an enjoyable 64.8°F (18.2°C). Weather in October »
Weather in November
November, the last month of the autumn in Chesterfield, is also a fresh month, with temperature in the range of an average high of 51.6°F (10.9°C) and an average low of 36.5°F (2.5°C). November implies a gentle temperature shift, with average high-temperatures reducing from October's comfortable 64.8°F (18.2°C) to a cool 51.6°F (10.9°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Chesterfield, Illinois, with an average temperature ranging between min 28.8°F (-1.8°C) and max 40.1°F (4.5°C). As November transitions into December, Chesterfield sees a drop in the average high-temperature, transitioning from a cool 51.6°F (10.9°C) to an icy 40.1°F (4.5°C). Weather in December »
Updated: Jul 26, 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 part of the year is the coldest?
The coldest month is January, with an average high-temperature of 34.9°F (1.6°C) and an average low-temperature of 22.5°F (-5.3°C).
What is the driest month?
January and February are months with the least rain when the rain falls for 6.3 days and typically aggregates up to 1.22" (31mm) of rain.
How much does it rain?
In Chesterfield, during the entire year, the rain falls for 138.2 days and collects up to 23.31" (592mm) of precipitation.
When does it snow?
January through March, November and December are months with snowfall.
How many days does it snow?
In Chesterfield, during the entire year, snow falls for 21.2 days and aggregates up to 6.65" (169mm) of snow.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 4.4h of sunshine.
When is the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the snowiest month in Chesterfield?
February is the month with the most snowfall. Snow falls for 6.3 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.
When it does not snow?
In Chesterfield, snow does not fall in April through October.
What is the wettest month?
The month with the most rainfall is June, when the rain falls for 15.4 days and typically aggregates up to 3.07" (78mm) of precipitation.
When are the longest days?
The month with the longest days is June, with an average of 14h and 54min of daylight.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.3h of sunshine.
What are the months with the highest UV index?
June through August, with an average maximum UV index of 6, are months with the highest UV index.
What part of the year is the hottest?
The warmest period is July, when temperatures fluctuate between an average high of 83.8°F (28.8°C) and a low of 66.9°F (19.4°C).
What is the most humid month in Chesterfield?
With an average relative humidity of 82%, July is the most humid month.
What is the least humid month?
The least humid month is October, with an average relative humidity of 71%.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
Average temperature
Chesterfield, IL
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (34.9°F).
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).
Average pressure
Chesterfield, IL
- Average pressure in January:
30.15"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.07"Hg - Average pressure in April:
29.94"Hg - Average pressure in May:
29.95"Hg - Average pressure in June:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.03"Hg - Average pressure in November:
30.12"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 (29.92"Hg).
Average wind speed
Chesterfield, IL
- Average wind speed in January:
10.1mph - Average wind speed in February:
9.9mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.8mph - Average wind speed in May:
8mph - Average wind speed in June:
7mph
- Average wind speed in July:
5.8mph - Average wind speed in August:
6mph - Average wind speed in September:
6.6mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.4mph - Average wind speed in December:
9.4mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (5.8mph).
Average humidity
Chesterfield, IL
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Chesterfield, IL
- Average rainfall in January:
1.22" - Average rainfall in February:
1.22" - Average rainfall in March:
1.77" - Average rainfall in April:
2.64" - Average rainfall in May:
2.76" - Average rainfall in June:
3.07"
- Average rainfall in July:
2.17" - Average rainfall in August:
2.28" - Average rainfall in September:
1.73" - Average rainfall in October:
1.73" - Average rainfall in November:
1.42" - Average rainfall in December:
1.3"
The wettest month (with the highest rainfall) is June (3.07").
The driest months (with the least rainfall) are January and February (1.22").
Average rainfall days
Chesterfield, IL
- Average rainfall days in January:
6.3 days - Average rainfall days in February:
6.4 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
14.6 days - Average rainfall days in May:
17.3 days - Average rainfall days in June:
15.4 days
- Average rainfall days in July:
15.3 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
11.5 days - Average rainfall days in October:
9.6 days - Average rainfall days in November:
8.6 days - Average rainfall days in December:
8.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (6.3 days).
Average snowfall
Chesterfield, IL
The month with the highest snowfall is February (2.28").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Chesterfield, IL
- Average snowfall days in January:
6.2 days - Average snowfall days in February:
6.3 days - Average snowfall days in March:
2.3 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:
4.7 days
The month with the highest number of snowfall days is February (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Chesterfield, 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 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 3min
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 30min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 2min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 2min - Average sunshine in June:
10h and 2min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 0min - Average sunshine in September:
9h and 2min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 5min
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 24min).
Average sunshine days
Chesterfield, IL
- Average sunshine days in January:
19.1 days - Average sunshine days in February:
16.4 days - Average sunshine days in March:
15.8 days - Average sunshine days in April:
14 days - Average sunshine days in May:
11.1 days - Average sunshine days in June:
12.1 days
- Average sunshine days in July:
13 days - Average sunshine days in August:
15 days - Average sunshine days in September:
16 days - Average sunshine days in October:
19.8 days - Average sunshine days in November:
19.4 days - Average sunshine days in December:
19.2 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.1 days).
Average UV index
Chesterfield, IL
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Chesterfield, IL
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are August and September (Cloud cover 29).
Average visibility
Chesterfield, 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).
Chesterfield, Illinois, USA
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