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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, in Clayton, Illinois, is another cold winter month, with an average temperature ranging between min 20.3°F (-6.5°C) and max 32.7°F (0.4°C). January is the month that records the lowest temperatures, with averages ranging from a high of 32.7°F (0.4°C) to a low of 20.3°F (-6.5°C). Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Clayton, Illinois, with an average temperature fluctuating between 37.9°F (3.3°C) and 24.3°F (-4.3°C). Clayton's February average high-temperature settles at a still icy 37.9°F (3.3°C), showing a near match with the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Clayton, is a fresh month, with an average temperature fluctuating between 35.2°F (1.8°C) and 50.9°F (10.5°C). March signals a shift in the average high-temperature, moving from February's icy 37.9°F (3.3°C) to a cool 50.9°F (10.5°C). Weather in March »
Weather in April
April is a refreshing spring month in Clayton, Illinois, with an average temperature varying between 45.3°F (7.4°C) and 62.6°F (17°C). The average high-temperature increases in April, moving from a fresh 50.9°F (10.5°C) in March to a refreshing 62.6°F (17°C). Weather in April »
Weather in May
May, the last month of the spring in Clayton, is an agreeable month, with an average temperature varying between 55.6°F (13.1°C) and 72°F (22.2°C). The shift from April to May is marked by an increase in the average high-temperature, moving from an enjoyable 62.6°F (17°C) to an agreeable 72°F (22.2°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Clayton, Illinois, with an average temperature fluctuating between 81°F (27.2°C) and 64°F (17.8°C). As Clayton transitions into June, the average high-temperature is observed to rise from an agreeable 72°F (22.2°C) in May to a warm 81°F (27.2°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Clayton, Illinois, with an average temperature fluctuating between 66.6°F (19.2°C) and 83.7°F (28.7°C). In Clayton, July is identified by the highest average temperatures, reaching a peak of 83.7°F (28.7°C) and a low of 66.6°F (19.2°C). July's mean heat index is computed to be a tropical 93.2°F (34°C). Weather in July »
Weather in August
August, the last month of the summer in Clayton, is also a moderately hot month, with temperature in the range of an average high of 82.9°F (28.3°C) and an average low of 64.4°F (18°C). Clayton signifies an average high-temperature of a still warm 82.9°F (28.3°C) in August, closely mirroring the 83.7°F (28.7°C) of July. Weather in August »
Weather in September
September, the first month of the autumn in Clayton, is also a moderately hot month, with an average temperature fluctuating between 77.7°F (25.4°C) and 58.1°F (14.5°C). Clayton notes an average high-temperature of a still moderately hot 77.7°F (25.4°C) in September, displaying minor variation from August. Weather in September »
Weather in October
October, the same as September, is another comfortable autumn month in Clayton, Illinois, with an average temperature varying between 63.9°F (17.7°C) and 46.8°F (8.2°C). A subtle decrease in the average high-temperature marks October, falling from September's warm 77.7°F (25.4°C) to a comfortable 63.9°F (17.7°C). Weather in October »
Weather in November
November, the last month of the autumn in Clayton, is another cool month, with an average temperature varying between 35.6°F (2°C) and 50°F (10°C). The average high-temperature drops in November, from October's refreshing 63.9°F (17.7°C) to a fresh 50°F (10°C). Weather in November »
Weather in December
The first month of the winter, December, is also a wintry month in Clayton, Illinois, with an average temperature ranging between min 26.8°F (-2.9°C) and max 38.5°F (3.6°C). As December arrives, Clayton's weather displays a decrease in high-temperatures, transitioning from November's cool 50°F (10°C) to an icy 38.5°F (3.6°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest month in Clayton?
Clayton, Illinois, records the coldest temperatures in January, averaging a high of 32.7°F (0.4°C) and a low of 20.3°F (-6.5°C).
What is the driest month in Clayton?
January is the month with the least rainfall in Clayton. Rain falls for 5.3 days and accumulates 0.98" (25mm) of precipitation.
How much does it rain in Clayton?
Throughout the year, in Clayton, there are 132 rainfall days, and 22.17" (563mm) of precipitation is accumulated.
When does it snow in Clayton?
January through April, November and December are months with snowfall in Clayton.
When does it snow the most in Clayton?
The month with the most snowfall in Clayton is January, when snow falls for 7.8 days and typically aggregates up to 3.19" (81mm) of snow.
How much does it snow in Clayton?
In Clayton, Illinois, during the entire year, snow falls for 23.8 days and aggregates up to 8.5" (216mm) of snow.
What is the month with the least sunshine in Clayton?
With an average of 4.3h of sunshine, January has the least sunshine of the year.
When is the lowest UV index in Clayton?
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in Clayton?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Clayton, 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 Clayton?
May is the month with the most rainfall. Rain falls for 16.9 days and accumulates 3.23" (82mm) of precipitation.
When it does not snow in Clayton?
In Clayton, snow does not fall in May through October.
When are the longest days in Clayton?
The month with the longest days in Clayton, Illinois, is June, with an average of 15h and 0min of daylight.
What are the months with the most sunshine in Clayton?
June and July, with an average of 10.2h of sunshine, are months with the most sunshine in Clayton, Illinois.
What is the month with the highest UV index in Clayton?
The months with the highest UV index in Clayton, Illinois, are June through August, with an average maximum UV index of 6.
What time of the year is the hottest in Clayton?
Clayton's July weather, marked by an average high temperature of 83.7°F (28.7°C) and an average low temperature of 66.6°F (19.2°C), is the warmest in the year.
What is the most humid month in Clayton?
July is the most humid month, with an average relative humidity of 82%.
What is the least humid month in Clayton?
October is the least humid month in Clayton, with an average relative humidity of 71%.
What is the month with the shortest days in Clayton?
The month with the shortest days in Clayton is December, with an average of 9h and 24min of daylight.
Average temperature
Clayton, IL
The warmest month (with the highest average high temperature) is July (83.7°F).
The month with the lowest average high temperature is January (32.7°F).
The month with the highest average low temperature is July (66.6°F).
The coldest month (with the lowest average low temperature) is January (20.3°F).
Average pressure
Clayton, 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:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.91"Hg
- Average pressure in July:
29.96"Hg - Average pressure in August:
29.97"Hg - Average pressure in September:
30.02"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"Hg - Average pressure in December:
30.12"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed
Clayton, IL
- Average wind speed in January:
10.2mph - Average wind speed in February:
10.1mph - Average wind speed in March:
10mph - Average wind speed in April:
10.1mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.3mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.7mph
The windiest month (with the highest average wind speed) is January (10.2mph).
The calmest month (with the lowest average wind speed) is July (6.3mph).
Average humidity
Clayton, IL
The month with the highest relative humidity is July (82%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Clayton, IL
- Average rainfall in January:
0.98" - Average rainfall in February:
1.06" - Average rainfall in March:
1.85" - Average rainfall in April:
2.44" - Average rainfall in May:
3.23" - Average rainfall in June:
2.48"
- Average rainfall in July:
1.81" - Average rainfall in August:
1.89" - Average rainfall in September:
2.2" - Average rainfall in October:
1.69" - Average rainfall in November:
1.46" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days
Clayton, IL
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
5.3 days - Average rainfall days in March:
12.8 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
16.9 days - Average rainfall days in June:
15 days
- Average rainfall days in July:
14.3 days - Average rainfall days in August:
12.2 days - Average rainfall days in September:
10.2 days - Average rainfall days in October:
10.4 days - Average rainfall days in November:
8.4 days - Average rainfall days in December:
6.4 days
The month with the highest number of rainy days is May (16.9 days).
The months with the least rainy days are January and February (5.3 days).
Average snowfall
Clayton, IL
The month with the highest snowfall is January (3.19").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days
Clayton, IL
- Average snowfall days in January:
7.8 days - Average snowfall days in February:
5.7 days - Average snowfall days in March:
3.3 days - Average snowfall days in April:
0.8 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:
1.4 days - Average snowfall days in December:
4.7 days
The month with the highest number of snowfall days is January (7.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Clayton, 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 2min - Average daylight in June:
15h and 0min
- 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: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- 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 1min - Average sunshine in May:
8h and 5min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days
Clayton, IL
- Average sunshine days in January:
20 days - Average sunshine days in February:
17.2 days - Average sunshine days in March:
14.9 days - Average sunshine days in April:
13.8 days - Average sunshine days in May:
11.4 days - Average sunshine days in June:
12.2 days
- Average sunshine days in July:
14.3 days - Average sunshine days in August:
16.3 days - Average sunshine days in September:
18.2 days - Average sunshine days in October:
19.1 days - Average sunshine days in November:
19.5 days - Average sunshine days in December:
19.4 days
The month with the most sunshine days is January (20 days).
The month with the least sunshine days is May (11.4 days).
Average UV index
Clayton, 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
Clayton, IL
The month with the most cloud cover is January (Cloud cover 54).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility
Clayton, 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).
Clayton, Illinois, USA
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