Climate and monthly weather forecastSouth Wilmington, IL
Climate and monthly weather forecast
Weather in January
January, like December, is another subzero cold winter month in South Wilmington, Illinois, with an average temperature varying between 29.8°F (-1.2°C) and 18°F (-7.8°C). In South Wilmington, the month of January registers the lowest temperatures, averaging 29.8°F (-1.2°C) at the peak and 18°F (-7.8°C) at the lowest. Weather in January »Weather in February
The last month of the winter, February, is an icy month in South Wilmington, Illinois, with temperature in the range of an average low of 20.8°F (-6.2°C) and an average high of 33.6°F (0.9°C). During February, the average high-temperature is a cold 33.6°F (0.9°C), maintaining a close resemblance to that of the preceding month. Weather in February »Weather in March
March, the first month of the spring in South Wilmington, is a frosty month, with temperature in the range of an average low of 32.9°F (0.5°C) and an average high of 47.5°F (8.6°C). In March, the average high-temperature increases from a cold 33.6°F (0.9°C) in February to a chilly 47.5°F (8.6°C). Weather in March »Weather in April
April in South Wilmington, Illinois, is a mild spring month, with temperature in the range of an average high of 58.8°F (14.9°C) and an average low of 42.6°F (5.9°C). South Wilmington's weather shows a temperature rise with the arrival of April, moving from a frosty 47.5°F (8.6°C) in March to a moderate 58.8°F (14.9°C). Weather in April »Weather in May
The last month of the spring, May, is a pleasant month in South Wilmington, Illinois, with an average temperature ranging between max 70.9°F (21.6°C) and min 54.1°F (12.3°C). May's onset is marked by a temperature increase, moving from a mild 58.8°F (14.9°C) in April to a pleasant 70.9°F (21.6°C). Weather in May »Weather in June
June, the first month of the summer in South Wilmington, is a warm month, with an average temperature fluctuating between 62.2°F (16.8°C) and 79.3°F (26.3°C). With the onset of June, the average high-temperature subtly transitions from a pleasant 70.9°F (21.6°C) in May to a warm 79.3°F (26.3°C). Weather in June »Weather in July
July, like June, in South Wilmington, Illinois, is another warm summer month, with an average temperature varying between 64.4°F (18°C) and 81.1°F (27.3°C). July temperatures tend to peak at an average high of 81.1°F (27.3°C) and dip to a low of 64.4°F (18°C). In July, the average heat index is estimated at a tropical 87.8°F (31°C). Weather in July »Weather in August
August, the last month of the summer in South Wilmington, is also a moderately hot month, with an average temperature ranging between min 62.2°F (16.8°C) and max 79.7°F (26.5°C). As August takes hold, the average high-temperature is a still moderately hot 79.7°F (26.5°C), nearly mirroring that of the previous month. Weather in August »Weather in September
The first month of the autumn, September, is still a warm month in South Wilmington, Illinois, with temperature in the range of an average high of 74.8°F (23.8°C) and an average low of 56.8°F (13.8°C). The arrival of September sees an average high-temperature of a still warm 74.8°F (23.8°C), hardly diverging from August's 79.7°F (26.5°C). Weather in September »Weather in October
October, like September, in South Wilmington, Illinois, is another comfortable autumn month, with an average temperature fluctuating between 46.2°F (7.9°C) and 62.1°F (16.7°C). October's onset brings a reduction in the average high-temperature, from a warm 74.8°F (23.8°C) in September to a refreshing 62.1°F (16.7°C). Weather in October »Weather in November
The last month of the autumn, November, is another chilly month in South Wilmington, Illinois, with an average temperature ranging between min 34.2°F (1.2°C) and max 47.3°F (8.5°C). November's arrival sees a clear drop in the average high-temperature, decreasing from October's enjoyable 62.1°F (16.7°C) to a chilly 47.3°F (8.5°C). Weather in November »Weather in December
December, the first month of the winter in South Wilmington, is also an icy month, with an average temperature ranging between min 25.7°F (-3.5°C) and max 35.6°F (2°C). The arrival of December signals a shift in temperature, down from a frosty 47.3°F (8.5°C) in November to an icy 35.6°F (2°C). Weather in December »Updated: Feb 12, 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
With average temperatures fluctuating between a high of 29.8°F (-1.2°C) and a low of 18°F (-7.8°C), January stands out as the coldest month.
In South Wilmington, Illinois, during the entire year, the rain falls for 140.4 days and collects up to 21.5" (546mm) of precipitation.
January through April, October through December are months with snowfall.
In South Wilmington, Illinois, during the entire year, snow falls for 38.1 days and aggregates up to 9.13" (232mm) of snow.
With an average of 3.9h of sunshine, January has the least sunshine of the year.
January and December, with an average maximum UV index of 1, are months with the lowest UV index in South Wilmington, Illinois.
February is the month with the least rainfall in South Wilmington. Rain falls for 5.1 days and accumulates 0.98" (25mm) of precipitation.
The month with the most snowfall in South Wilmington, Illinois, is February, when snow falls for 8.9 days and typically aggregates up to 2.52" (64mm) of snow.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in South Wilmington, 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.
The month with the most rainfall in South Wilmington is May, when the rain falls for 17.1 days and typically aggregates up to 2.91" (74mm) of precipitation.
May through September are months without snowfall in South Wilmington, Illinois.
The month with the longest days in South Wilmington, Illinois, is June, with an average of 15h and 6min of daylight.
The month with the most sunshine is June, with an average of 9.9h of sunshine.
June and July, with an average maximum UV index of 6, are months with the highest UV index.
In South Wilmington, the peak average temperatures are observed in July, with a high of 81.1°F (27.3°C) and a low of 64.4°F (18°C).
July is the most humid month in South Wilmington, with an average relative humidity of 84%.
October is the least humid month, with an average relative humidity of 72%.
December has the shortest days of the year in South Wilmington, with an average of 9h and 18min of daylight.
Average temperature
South Wilmington, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (29.8°F).
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (18°F).
Average pressure
South Wilmington, IL
- Average pressure in January:
30.12"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:
29.92"Hg
- Average pressure in July:
29.97"Hg - Average pressure in August:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.01"Hg - Average pressure in November:
30.1"Hg - Average pressure in December:
30.1"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
South Wilmington, 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:
10.1mph - Average wind speed in May:
8.6mph - Average wind speed in June:
7.5mph
- Average wind speed in July:
6.2mph - Average wind speed in August:
6mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.9mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.4mph
The windiest months (with the highest average wind speed) are January and April (10.1mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity
South Wilmington, IL
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall
South Wilmington, IL
- Average rainfall in January:
1.06" - Average rainfall in February:
0.98" - Average rainfall in March:
1.34" - Average rainfall in April:
2.28" - Average rainfall in May:
2.91" - Average rainfall in June:
2.64"
- Average rainfall in July:
2.4" - Average rainfall in August:
2.13" - Average rainfall in September:
1.65" - Average rainfall in October:
1.97" - Average rainfall in November:
1.06" - Average rainfall in December:
1.06"
The wettest month (with the highest rainfall) is May (2.91").
The driest month (with the least rainfall) is February (0.98").
Average rainfall days
South Wilmington, IL
- Average rainfall days in January:
5.3 days - Average rainfall days in February:
5.1 days - Average rainfall days in March:
11 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
17.1 days - Average rainfall days in June:
16.9 days
- Average rainfall days in July:
17.3 days - Average rainfall days in August:
14.8 days - Average rainfall days in September:
12.2 days - Average rainfall days in October:
11.2 days - Average rainfall days in November:
8 days - Average rainfall days in December:
7.2 days
The month with the highest number of rainy days is July (17.3 days).
The month with the least rainy days is February (5.1 days).
Average snowfall
South Wilmington, IL
The month with the highest snowfall is February (2.52").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
South Wilmington, IL
- Average snowfall days in January:
11.5 days - Average snowfall days in February:
8.9 days - Average snowfall days in March:
5.5 days - Average snowfall days in April:
1.3 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:
0.3 days - Average snowfall days in November:
2.1 days - Average snowfall days in December:
8.5 days
The month with the highest number of snowfall days is January (11.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
South Wilmington, IL
- Average daylight in January:
9h and 36min - Average daylight in February:
10h and 42min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 18min - Average daylight in May:
14h and 30min - Average daylight in June:
15h and 6min
- Average daylight in July:
14h and 48min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 6min - Average daylight in November:
9h and 54min - Average daylight in December:
9h and 18min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
3h and 54min - Average sunshine in February:
4h and 0min - Average sunshine in March:
6h and 12min - Average sunshine in April:
7h and 48min - Average sunshine in May:
8h and 54min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
9h and 48min - Average sunshine in August:
9h and 48min - Average sunshine in September:
8h and 48min - Average sunshine in October:
6h and 0min - Average sunshine in November:
5h and 12min - Average sunshine in December:
4h and 18min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
South Wilmington, IL
- Average sunshine days in January:
15.5 days - Average sunshine days in February:
14.3 days - Average sunshine days in March:
14.5 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10 days
- Average sunshine days in July:
9.5 days - Average sunshine days in August:
10.9 days - Average sunshine days in September:
14.9 days - Average sunshine days in October:
17.2 days - Average sunshine days in November:
19.3 days - Average sunshine days in December:
17.3 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is July (9.5 days).
Average UV index
South Wilmington, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
South Wilmington, IL
The month with the most cloud cover is January (Cloud cover 59).
The months with the least cloud cover are August and September (Cloud cover 33).
Average visibility
South Wilmington, 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).
