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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 Jacksonville, Illinois, with temperature in the range of an average high of 33.4°F (0.8°C) and an average low of 21°F (-6.1°C). Jacksonville reaches its lowest average temperatures in January, measuring 33.4°F (0.8°C) at the peak and 21°F (-6.1°C) at the lowest. Weather in January »
Weather in February
February, the last month of the winter in Jacksonville, is another cold month, with an average temperature fluctuating between 38.3°F (3.5°C) and 24.6°F (-4.1°C). Jacksonville records an average high-temperature of a still wintry 38.3°F (3.5°C) in February, maintaining a close correlation with January's 33.4°F (0.8°C). Weather in February »
Weather in March
March, the first month of the spring in Jacksonville, is a fresh month, with an average temperature ranging between max 51.4°F (10.8°C) and min 36.1°F (2.3°C). Jacksonville's weather in March shows a rise in the average high-temperature, moving up from February's icy 38.3°F (3.5°C) to a cool 51.4°F (10.8°C). Weather in March »
Weather in April
April is an enjoyable spring month in Jacksonville, Illinois, with temperature in the range of an average low of 46.2°F (7.9°C) and an average high of 63.3°F (17.4°C). April brings a rise in Jacksonville's average high-temperature, moving from a fresh 51.4°F (10.8°C) in March to a refreshing 63.3°F (17.4°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Jacksonville, Illinois, with an average temperature ranging between min 55.9°F (13.3°C) and max 72.9°F (22.7°C). May brings a temperature increase, with average high-temperatures moving from April's comfortable 63.3°F (17.4°C) to an agreeable 72.9°F (22.7°C). Weather in May »
Weather in June
June, the first month of the summer in Jacksonville, is a warm month, with temperature in the range of an average high of 81.5°F (27.5°C) and an average low of 64.6°F (18.1°C). June introduces a marginal temperature uplift, with average high-temperatures adjusting from May's pleasant 72.9°F (22.7°C) to a moderately hot 81.5°F (27.5°C). Weather in June »
Weather in July
July, like June, in Jacksonville, Illinois, is a moderately hot summer month, with an average temperature fluctuating between 83.3°F (28.5°C) and 66.7°F (19.3°C). July, having an average high-temperature of 83.3°F (28.5°C) and an average low-temperature of 66.7°F (19.3°C), is the warmest month. The heat index value for July is calculated to be a hot 93.2°F (34°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Jacksonville, Illinois, with an average temperature ranging between min 64.8°F (18.2°C) and max 82.6°F (28.1°C). Jacksonville's average high-temperature marks a still moderately hot 82.6°F (28.1°C) with the advent of August, closely mirroring that of the preceding month. Weather in August »
Weather in September
The first month of the autumn, September, is also a moderately hot month in Jacksonville, Illinois, with an average temperature ranging between min 58.6°F (14.8°C) and max 77.7°F (25.4°C). The dawn of September sees an average high-temperature of a still moderately hot 77.7°F (25.4°C), subtly contrasting with 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 Jacksonville, Illinois, with an average temperature varying between 64°F (17.8°C) and 47.5°F (8.6°C). Jacksonville's October weather comes with a decrease in average high-temperatures, moving from a moderately hot 77.7°F (25.4°C) in September 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 Jacksonville, Illinois, with an average temperature varying between 50.5°F (10.3°C) and 36°F (2.2°C). November's onset corresponds with a shift in the average high-temperature, moving from a comfortable 64°F (17.8°C) in October to a cool 50.5°F (10.3°C). Weather in November »
Weather in December
December, the first month of the winter in Jacksonville, is also an icy month, with an average temperature varying between 39°F (3.9°C) and 27.7°F (-2.4°C). December comes with a decrease in the average high-temperature, falling 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 month in Jacksonville?
January, having an average high-temperature of 33.4°F (0.8°C) and an average low-temperature of 21°F (-6.1°C), is the coldest month in Jacksonville, Illinois.
How many days does it rain in Jacksonville?
In Jacksonville, during the entire year, the rain falls for 148.2 days and collects up to 29.37" (746mm) of precipitation.
When does it snow in Jacksonville?
January through April, October through December are months with snowfall.
When does it snow the most in Jacksonville?
January is the month with the most snowfall in Jacksonville. Snow falls for 9.6 days and accumulates 3.58" (91mm) of snow.
How many days does it snow in Jacksonville?
Throughout the year, there are 28.3 snowfall days, and 9.76" (248mm) of snow is accumulated.
What is the month with the least sunshine in Jacksonville?
With an average of 4.3h of sunshine, January has the least sunshine of the year in Jacksonville.
What are the months with the lowest UV index in Jacksonville?
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 Jacksonville?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Jacksonville, 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.
When it does not snow in Jacksonville?
May through September are months without snowfall in Jacksonville.
What is the wettest month in Jacksonville?
The month with the most rainfall in Jacksonville 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 Jacksonville?
The month with the longest days in Jacksonville is June, with an average of 14h and 54min of daylight.
What month has the most sunshine in Jacksonville?
The month with the most sunshine is June, with an average of 10.3h of sunshine.
What is the month with the highest UV index in Jacksonville?
The months with the highest UV index in Jacksonville are June through August, with an average maximum UV index of 6.
What part of the year is the hottest in Jacksonville?
Temperature readings in Jacksonville reach their annual highs in July, averaging 83.3°F (28.5°C) and a minimum average of 66.7°F (19.3°C).
What is the most humid month in Jacksonville?
The most humid month in Jacksonville, Illinois, is July, with an average relative humidity of 83%.
What is the least humid month in Jacksonville?
October is the least humid month, with an average relative humidity of 71%.
What is the driest month in Jacksonville?
December is the month with the least rainfall in Jacksonville, Illinois. Rain falls for 8.1 days and accumulates 1.54" (39mm) of precipitation.
What is the month with the shortest days in Jacksonville?
December has the shortest days of the year, with an average of 9h and 24min of daylight.
Average temperature
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
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
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
Jacksonville, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
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
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
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
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
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
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
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
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
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).
Jacksonville, Illinois, USA
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