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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 Swansea, Illinois, is a wintry winter month, with temperature in the range of an average low of 24.8°F (-4°C) and an average high of 37.8°F (3.2°C). January, with its high-temperature average of 37.8°F (3.2°C) and a low-temperature average of 24.8°F (-4°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is another cold month in Swansea, Illinois, with temperature in the range of an average low of 27.9°F (-2.3°C) and an average high of 42.4°F (5.8°C). February records an average high-temperature of a still wintry 42.4°F (5.8°C), indicating a minor variation from the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a cool month in Swansea, Illinois, with an average temperature fluctuating between 54.5°F (12.5°C) and 37.9°F (3.3°C). With the onset of March, Swansea's average high-temperature experiences a rise, moving from February's icy 42.4°F (5.8°C) to a fresh 54.5°F (12.5°C). Weather in March »
Weather in April
April in Swansea, Illinois, is a comfortable spring month, with an average temperature ranging between min 47.8°F (8.8°C) and max 65.5°F (18.6°C). Swansea's transition into April sees a rise in the average high-temperature, advancing from a fresh 54.5°F (12.5°C) in March to a refreshing 65.5°F (18.6°C). Weather in April »
Weather in May
The last month of the spring, May, is a moderately hot month in Swansea, Illinois, with an average temperature ranging between min 57.9°F (14.4°C) and max 74.8°F (23.8°C). May's onset witnesses a shift in the average high-temperature, moving from an enjoyable 65.5°F (18.6°C) in April to a warm 74.8°F (23.8°C). Weather in May »
Weather in June
The first month of the summer, June, is still a warm month in Swansea, Illinois, with an average temperature varying between 66.6°F (19.2°C) and 83.7°F (28.7°C). June signals a minor shift in the average high-temperature, moving from May's moderately hot 74.8°F (23.8°C) to a still warm 83.7°F (28.7°C). Weather in June »
Weather in July
July, like June, in Swansea, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 68.4°F (20.2°C) and an average high of 85.8°F (29.9°C). The month of July sees the highest average temperatures, reaching 85.8°F (29.9°C) at the peak and 68.4°F (20.2°C) at the low. Throughout July, the heat index is evaluated at a torrid 98.6°F (37°C). Weather in July »
Weather in August
August, the last month of the summer in Swansea, is another warm month, with an average temperature fluctuating between 66°F (18.9°C) and 84.6°F (29.2°C). The introduction of August sees an average high-temperature of a still warm 84.6°F (29.2°C), hardly deviating from July. Weather in August »
Weather in September
September, the first month of the autumn in Swansea, is also a moderately hot month, with an average temperature ranging between min 59.9°F (15.5°C) and max 79.3°F (26.3°C). September reports an average high-temperature of a still moderately hot 79.3°F (26.3°C), slightly varied from August's 84.6°F (29.2°C). Weather in September »
Weather in October
October, like September, in Swansea, Illinois, is another comfortable autumn month, with an average temperature varying between 48.9°F (9.4°C) and 66.7°F (19.3°C). Transition into October marks a drop in the average high-temperature, moving from a moderately hot 79.3°F (26.3°C) in September to an enjoyable 66.7°F (19.3°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a fresh month in Swansea, Illinois, with an average temperature varying between 37.8°F (3.2°C) and 53.4°F (11.9°C). November involves a decrease in temperature, down from a comfortable 66.7°F (19.3°C) in October to a fresh 53.4°F (11.9°C). Weather in November »
Weather in December
The first month of the winter, December, is also an icy month in Swansea, Illinois, with temperature in the range of an average low of 30.6°F (-0.8°C) and an average high of 42.6°F (5.9°C). A shift in the average high-temperature occurs in December, reducing from a cool 53.4°F (11.9°C) in November to a wintry 42.6°F (5.9°C). Weather in December »
Updated: Aug 23, 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?
Swansea's coldest month, January, generally records average temperatures ranging from a high of 37.8°F (3.2°C) to a low of 24.8°F (-4°C).
How many days does it rain?
Throughout the year, there are 147.1 rainfall days, and 35.43" (900mm) of precipitation is accumulated.
When does it snow?
January through March, November and December are months with snowfall.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 7.3 days and typically aggregates up to 2.4" (61mm) of snow.
How much does it snow?
Throughout the year, there are 21.1 snowfall days, and 8.11" (206mm) of snow is accumulated.
What is the month with the least sunshine?
The month with the least sunshine is January, with an average of 4.5h of sunshine.
What are the months with the lowest UV index?
January, February and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the driest month?
The month with the least rainfall is February, when the rain falls for 7.8 days and typically collects 1.93" (49mm) of precipitation.
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 Swansea?
April through October are months without snowfall.
What is the most humid month?
May and July, with an average relative humidity of 79%, are most humid months.
What is the rainiest month?
May is the month with the most rainfall. Rain falls for 16.4 days and accumulates 4.37" (111mm) of precipitation.
What is the month with the highest UV index?
The months with the highest UV index are May through August, with an average maximum UV index of 6.
When are the longest days?
With an average of 14h and 48min of daylight, June has the longest days of the year in Swansea.
What month has the most sunshine?
The month with the most sunshine is June, with an average of 10.3h of sunshine.
What month is the hottest in Swansea?
In Swansea, July is known for its average highest temperatures, reaching a high of 85.8°F (29.9°C) and a low of 68.4°F (20.2°C).
What is the least humid month in Swansea?
With an average relative humidity of 71%, October is the least humid month in Swansea.
What is the month with the shortest days?
With an average of 9h and 30min of daylight, December has the shortest days of the year.
Average temperature
Swansea, IL
The warmest month (with the highest average high temperature) is July (85.8°F).
The month with the lowest average high temperature is January (37.8°F).
The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure
Swansea, 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:
29.94"Hg - Average pressure in May:
29.96"Hg - Average pressure in June:
29.92"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:
30.03"Hg - Average pressure in November:
30.13"Hg - Average pressure in December:
30.13"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Swansea, IL
- Average wind speed in January:
9.4mph - Average wind speed in February:
9.3mph - Average wind speed in March:
9.1mph - Average wind speed in April:
9.1mph - Average wind speed in May:
7.5mph - Average wind speed in June:
6.6mph
- Average wind speed in July:
5.6mph - Average wind speed in August:
5.7mph - Average wind speed in September:
6.1mph - Average wind speed in October:
7.9mph - Average wind speed in November:
8.5mph - Average wind speed in December:
8.7mph
The windiest month (with the highest average wind speed) is January (9.4mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity
Swansea, IL
The months with the highest relative humidity are May and July (79%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Swansea, IL
- Average rainfall in January:
2.32" - Average rainfall in February:
1.93" - Average rainfall in March:
2.72" - Average rainfall in April:
3.78" - Average rainfall in May:
4.37" - Average rainfall in June:
3.98"
- Average rainfall in July:
3.43" - Average rainfall in August:
3.31" - Average rainfall in September:
2.2" - Average rainfall in October:
2.95" - Average rainfall in November:
2.17" - Average rainfall in December:
2.28"
The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.93").
Average rainfall days
Swansea, IL
- Average rainfall days in January:
6.8 days - Average rainfall days in February:
7.8 days - Average rainfall days in March:
14.3 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
16.4 days - Average rainfall days in June:
14.8 days
- Average rainfall days in July:
16.3 days - Average rainfall days in August:
12.9 days - Average rainfall days in September:
12.5 days - Average rainfall days in October:
10.6 days - Average rainfall days in November:
10.5 days - Average rainfall days in December:
8.4 days
The month with the highest number of rainy days is May (16.4 days).
The month with the least rainy days is January (6.8 days).
Average snowfall
Swansea, IL
The month with the highest snowfall is January (2.4").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days
Swansea, IL
- Average snowfall days in January:
7.3 days - Average snowfall days in February:
6 days - Average snowfall days in March:
2.1 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:
0.1 days - Average snowfall days in October:
0.1 days - Average snowfall days in November:
1.2 days - Average snowfall days in December:
4 days
The month with the highest number of snowfall days is January (7.3 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight / Average sunshine
Swansea, 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 2min - 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 3min
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 30min).
- Average sunshine in January:
4h and 3min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 1min - Average sunshine in April:
8h and 2min - Average sunshine in May:
9h and 1min - 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 1min - Average sunshine in October:
6h and 1min - Average sunshine in November:
5h and 3min - Average sunshine in December:
4h and 4min
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 30min).
Average sunshine days
Swansea, IL
- Average sunshine days in January:
17.5 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
13.7 days - Average sunshine days in April:
13.1 days - Average sunshine days in May:
12.3 days - Average sunshine days in June:
13.3 days
- Average sunshine days in July:
12.8 days - Average sunshine days in August:
16.2 days - Average sunshine days in September:
16.1 days - Average sunshine days in October:
18.3 days - Average sunshine days in November:
17.3 days - Average sunshine days in December:
18.2 days
The month with the most sunshine days is October (18.3 days).
The month with the least sunshine days is May (12.3 days).
Average UV index
Swansea, 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
Swansea, IL
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility
Swansea, 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).
Swansea, Illinois, USA
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