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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 South Jacksonville, Illinois, with an average temperature fluctuating between 33.4°F (0.8°C) and 21°F (-6.1°C). Temperature readings reach their annual highs in January, averaging 33.4°F (0.8°C) and a minimum average of 21°F (-6.1°C). Weather in January »
Weather in February
February, the last month of the winter in South Jacksonville, is also an icy month, with an average temperature varying between 24.6°F (-4.1°C) and 38.3°F (3.5°C). February begins with an average high-temperature of a still wintry 38.3°F (3.5°C), reflecting close similarity to the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a cool month in South Jacksonville, Illinois, with an average temperature fluctuating between 51.4°F (10.8°C) and 36.1°F (2.3°C). South Jacksonville in March experiences an increase in the average high-temperature, moving from February's icy 38.3°F (3.5°C) to a fresh 51.4°F (10.8°C). Weather in March »
Weather in April
April is a refreshing spring month in South Jacksonville, Illinois, with an average temperature varying between 63.3°F (17.4°C) and 46.2°F (7.9°C). April brings a temperature change, with average high-temperatures moving from March's fresh 51.4°F (10.8°C) to a refreshing 63.3°F (17.4°C). Weather in April »
Weather in May
May, the last month of the spring in South Jacksonville, is a pleasant month, with an average temperature ranging between max 72.9°F (22.7°C) and min 55.9°F (13.3°C). South Jacksonville's transition into May is marked by a rise in the average high-temperature, advancing from a comfortable 63.3°F (17.4°C) in April to a pleasant 72.9°F (22.7°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in South Jacksonville, Illinois, with an average temperature ranging between max 81.5°F (27.5°C) and min 64.6°F (18.1°C). As June sets, the average high-temperature shows a slight increase, moving up from an agreeable 72.9°F (22.7°C) in May to a warm 81.5°F (27.5°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in South Jacksonville, Illinois, with an average temperature varying between 66.7°F (19.3°C) and 83.3°F (28.5°C). The warmest period tends to be July, when average temperatures fluctuate between a high of 83.3°F (28.5°C) and a low of 66.7°F (19.3°C). July's heat index is evaluated at a hot 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in South Jacksonville, Illinois, with an average temperature fluctuating between 82.6°F (28.1°C) and 64.8°F (18.2°C). South Jacksonville's August reports an average high-temperature of a still moderately hot 82.6°F (28.1°C), exhibiting a minor difference from July. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in South Jacksonville, Illinois, with temperature in the range of an average high of 77.7°F (25.4°C) and an average low of 58.6°F (14.8°C). September reports an average high-temperature of a still moderately hot 77.7°F (25.4°C), slightly varied from August's 82.6°F (28.1°C). Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in South Jacksonville, Illinois, with an average temperature ranging between max 64°F (17.8°C) and min 47.5°F (8.6°C). Transition from September to October is accompanied by a temperature drop, with average high-temperatures decreasing from a warm 77.7°F (25.4°C) to a comfortable 64°F (17.8°C). Weather in October »
Weather in November
The last month of the autumn, November, is another cool month in South Jacksonville, Illinois, with an average temperature varying between 50.5°F (10.3°C) and 36°F (2.2°C). November's arrival coincides with a drop in the average high-temperature, decreasing from October's refreshing 64°F (17.8°C) to a fresh 50.5°F (10.3°C). Weather in November »
Weather in December
December, the first month of the winter in South Jacksonville, is also an icy month, with an average temperature ranging between max 39°F (3.9°C) and min 27.7°F (-2.4°C). In the transition to December, South Jacksonville observes a drop in the average high-temperature, moving from a cool 50.5°F (10.3°C) in November to a wintry 39°F (3.9°C). Weather in December »
[Resources]Frequently asked questions
What is the coldest time of year in South Jacksonville?
In South Jacksonville, Illinois, the lowest temperatures are generally noted in January, averaging a high of 33.4°F (0.8°C) and a low of 21°F (-6.1°C).
How much does it rain in South Jacksonville?
Throughout the year, in South Jacksonville, Illinois, there are 148.2 rainfall days, and 29.37" (746mm) of precipitation is accumulated.
When does it snow in South Jacksonville?
Months with snowfall in South Jacksonville are January through April, October through December.
What is the snowiest month in South Jacksonville?
The month with the most snowfall is January, when snow falls for 9.6 days and typically aggregates up to 3.58" (91mm) of snow.
How many days does it snow in South Jacksonville?
Throughout the year, in South Jacksonville, there are 28.3 snowfall days, and 9.76" (248mm) of snow is accumulated.
What is the month with the least sunshine in South Jacksonville?
The month with the least sunshine in South Jacksonville, Illinois, is January, with an average of 4.3h of sunshine.
What is the month with the lowest UV index in South Jacksonville?
The months with the lowest UV index in South Jacksonville, Illinois, are January, February, November and December, with an average maximum UV index of 2.
When is Daylight Saving Time (DST) in South Jacksonville?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in South Jacksonville, 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 South Jacksonville?
In South Jacksonville, Illinois, snow does not fall in May through September.
What is the wettest month in South Jacksonville?
The month with the most rainfall is June, when the rain falls for 15.8 days and typically aggregates up to 3.58" (91mm) of precipitation.
When are the longest days in South Jacksonville?
The month with the longest days in South Jacksonville, Illinois, is June, with an average of 14h and 54min of daylight.
What month has the most sunshine in South Jacksonville?
With an average of 10.3h of sunshine, June has the most sunshine of the year in South Jacksonville.
When is the highest UV index in South Jacksonville?
June through August, with an average maximum UV index of 6, are months with the highest UV index in South Jacksonville.
What is the hottest time of year in South Jacksonville?
In South Jacksonville, the peak average temperatures are observed in July, with a high of 83.3°F (28.5°C) and a low of 66.7°F (19.3°C).
What is the most humid month in South Jacksonville?
The most humid month in South Jacksonville, Illinois, is July, with an average relative humidity of 83%.
What is the least humid month in South Jacksonville?
The least humid month in South Jacksonville is October, with an average relative humidity of 71%.
What is the driest month in South Jacksonville?
December is the month with the least rainfall. Rain falls for 8.1 days and accumulates 1.54" (39mm) of precipitation.
What is the month with the shortest days in South Jacksonville?
The month with the shortest days is December, with an average of 9h and 24min of daylight.
Average temperature
South Jacksonville, IL
The warmest month (with the highest average high temperature) is July (83.3°F).
The month with the lowest average high temperature is January (33.4°F).
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21°F).
Average pressure
South Jacksonville, 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:
29.95"Hg - Average pressure in June:
29.91"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:
30.02"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
South Jacksonville, IL
- Average wind speed in January:
10.1mph - Average wind speed in February:
10mph - Average wind speed in March:
9.9mph - Average wind speed in April:
10mph - Average wind speed in May:
8.2mph - Average wind speed in June:
7.1mph
- Average wind speed in July:
6.1mph - Average wind speed in August:
6.2mph - Average wind speed in September:
7mph - Average wind speed in October:
8.8mph - Average wind speed in November:
9.6mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is January (10.1mph).
The calmest month (with the lowest average wind speed) is July (6.1mph).
Average humidity
South Jacksonville, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
South Jacksonville, IL
- Average rainfall in January:
1.69" - Average rainfall in February:
1.61" - Average rainfall in March:
2.28" - Average rainfall in April:
3.39" - Average rainfall in May:
3.46" - Average rainfall in June:
3.58"
- Average rainfall in July:
2.28" - Average rainfall in August:
2.4" - Average rainfall in September:
2.64" - Average rainfall in October:
2.72" - Average rainfall in November:
1.77" - Average rainfall in December:
1.54"
The wettest month (with the highest rainfall) is June (3.58").
The driest month (with the least rainfall) is December (1.54").
Average rainfall days
South Jacksonville, IL
- Average rainfall days in January:
7.1 days - Average rainfall days in February:
7.1 days - Average rainfall days in March:
13.5 days - Average rainfall days in April:
15.8 days - Average rainfall days in May:
18 days - Average rainfall days in June:
15.8 days
- Average rainfall days in July:
15.8 days - Average rainfall days in August:
13.5 days - Average rainfall days in September:
11.7 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
10 days - Average rainfall days in December:
8.1 days
The month with the highest number of rainy days is May (18 days).
The months with the least rainy days are January and February (7.1 days).
Average snowfall
South Jacksonville, IL
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
South Jacksonville, IL
- Average snowfall days in January:
9.6 days - Average snowfall days in February:
7.2 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:
0.2 days - Average snowfall days in November:
2.2 days - Average snowfall days in December:
5 days
The month with the highest number of snowfall days is January (9.6 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
South Jacksonville, 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:
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 2min
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 24min).
- Average sunshine in January:
4h and 2min - Average sunshine in February:
4h and 4min - Average sunshine in March:
6h and 4min - 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:
5h and 5min - Average sunshine in November:
5h and 2min - 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 18min).
Average sunshine days
South Jacksonville, IL
- Average sunshine days in January:
15.9 days - Average sunshine days in February:
14.8 days - Average sunshine days in March:
14.1 days - Average sunshine days in April:
11.9 days - Average sunshine days in May:
11 days - Average sunshine days in June:
10.5 days
- Average sunshine days in July:
12.3 days - Average sunshine days in August:
15 days - Average sunshine days in September:
15.7 days - Average sunshine days in October:
17.3 days - Average sunshine days in November:
18.1 days - Average sunshine days in December:
18.5 days
The month with the most sunshine days is December (18.5 days).
The month with the least sunshine days is June (10.5 days).
Average UV index
South Jacksonville, 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
South Jacksonville, IL
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility
South Jacksonville, 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).
South Jacksonville, Illinois, USA
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