Expand
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, is another subzero cold winter month in Illinois City, Illinois, with temperature in the range of an average high of 28.2°F (-2.1°C) and an average low of 16.2°F (-8.8°C). January, recording an average high temperature of 28.2°F (-2.1°C) and a low temperature of 16.2°F (-8.8°C), is Illinois City's coldest month. Weather in January »
Weather in February
The last month of the winter, February, is a cold month in Illinois City, Illinois, with an average temperature varying between 33.1°F (0.6°C) and 20.1°F (-6.6°C). Illinois City notes an average high-temperature of a wintry 33.1°F (0.6°C) in February, hardly diverging from January. Weather in February »
Weather in March
The first month of the spring, March, is a chilly month in Illinois City, Illinois, with an average temperature varying between 32.2°F (0.1°C) and 46.9°F (8.3°C). Entering March, Illinois City sees a temperature rise, with the average high-temperature advancing from February's cold 33.1°F (0.6°C) to a chilly 46.9°F (8.3°C). Weather in March »
Weather in April
April is a moderate spring month in Illinois City, Illinois, with an average temperature ranging between max 59.2°F (15.1°C) and min 42.4°F (5.8°C). April's arrival coincides with a rise in the average high-temperature, moving from March's chilly 46.9°F (8.3°C) to a moderate 59.2°F (15.1°C). Weather in April »
Weather in May
May, the last month of the spring in Illinois City, is a pleasant month, with an average temperature ranging between max 70.3°F (21.3°C) and min 53.6°F (12°C). As Illinois City transitions into May, the average high-temperature shows a change, moving from a refreshing 59.2°F (15.1°C) in April to a pleasant 70.3°F (21.3°C). Weather in May »
Weather in June
June, the first month of the summer in Illinois City, is a warm month, with an average temperature fluctuating between 79°F (26.1°C) and 62.4°F (16.9°C). The onset of June introduces a subtle rise in the average high-temperature, nudging from an agreeable 70.3°F (21.3°C) in May to a warm 79°F (26.1°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Illinois City, Illinois, with an average temperature varying between 81.7°F (27.6°C) and 65.1°F (18.4°C). In Illinois City, the month of July registers the highest temperatures, averaging 81.7°F (27.6°C) at the peak and 65.1°F (18.4°C) at the lowest. July's average heat index is calculated to be a tropical 89.6°F (32°C). Weather in July »
Weather in August
August, the last month of the summer in Illinois City, is another warm month, with temperature in the range of an average low of 63.1°F (17.3°C) and an average high of 80.8°F (27.1°C). In August, Illinois City notes an average high-temperature of a still warm 80.8°F (27.1°C), hardly different from the preceding month. Weather in August »
Weather in September
September, the first month of the autumn in Illinois City, is still a warm month, with an average temperature fluctuating between 75.4°F (24.1°C) and 56.3°F (13.5°C). The onset of September is marked by a minor decrease in temperature, transitioning from a moderately hot 80.8°F (27.1°C) in August to a still warm 75.4°F (24.1°C). Weather in September »
Weather in October
October, like September, in Illinois City, Illinois, is another enjoyable autumn month, with an average temperature ranging between min 45.1°F (7.3°C) and max 61.5°F (16.4°C). A shift in Illinois City's weather is observed as September turns into October, with the average high temperature reducing from a warm 75.4°F (24.1°C) to an enjoyable 61.5°F (16.4°C). Weather in October »
Weather in November
November, the last month of the autumn in Illinois City, is another chilly month, with an average temperature fluctuating between 33.3°F (0.7°C) and 47.1°F (8.4°C). The transition into November involves a decrease in the average high-temperature, falling from an enjoyable 61.5°F (16.4°C) in October to a chilly 47.1°F (8.4°C). Weather in November »
Weather in December
December, the first month of the winter in Illinois City, is still a cold month, with an average temperature ranging between max 34.5°F (1.4°C) and min 24.1°F (-4.4°C). In the transition to December, Illinois City observes a drop in the average high-temperature, moving from a chilly 47.1°F (8.4°C) in November to a wintry 34.5°F (1.4°C). Weather in December »
[Resources]Frequently asked questions
What part of the year is the coldest in Illinois City?
The coldest month is January, with an average high-temperature of 28.2°F (-2.1°C) and an average low-temperature of 16.2°F (-8.8°C).
What is the most humid month in Illinois City?
January and July, with an average relative humidity of 83%, are most humid months in Illinois City.
How much does it rain in Illinois City?
Throughout the year, in Illinois City, Illinois, there are 128 rainfall days, and 19.29" (490mm) of precipitation is accumulated.
When does it snow in Illinois City?
January through April, October through December are months with snowfall.
How much does it snow in Illinois City?
Throughout the year, in Illinois City, Illinois, there are 35.4 snowfall days, and 8.35" (212mm) of snow is accumulated.
What is the month with the least sunshine in Illinois City?
January has the least sunshine of the year in Illinois City, with an average of 4h of sunshine.
When is the lowest UV index in Illinois City?
The month with the lowest UV index in Illinois City, Illinois, is January, with an average maximum UV index of 1.
What is the snowiest month in Illinois City?
February is the month with the most snowfall in Illinois City, Illinois. Snow falls for 8.8 days and accumulates 2.52" (64mm) of snow.
When is Daylight Saving Time (DST) in Illinois City?
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.
What is the wettest month in Illinois City?
May is the month with the most rainfall in Illinois City. Rain falls for 16.5 days and accumulates 3.31" (84mm) of precipitation.
When it does not snow in Illinois City?
In Illinois City, Illinois, snow does not fall in May through September.
When are the longest days in Illinois City?
June has the longest days of the year, with an average of 15h and 6min of daylight.
What is the month with the highest UV index in Illinois City?
The months with the highest UV index are June and July, with an average maximum UV index of 6.
What are the warmest months in Illinois City?
Temperature records in Illinois City, Illinois, mark July as the warmest month, with highs averaging 81.7°F (27.6°C) and lows at 65.1°F (18.4°C).
What month has the most sunshine in Illinois City?
The month with the most sunshine is July, with an average of 10.3h of sunshine.
What is the least humid month in Illinois City?
October is the least humid month, with an average relative humidity of 71%.
What is the driest month in Illinois City?
The month with the least rainfall in Illinois City, Illinois, is December, when the rain falls for 6.6 days and typically collects 0.75" (19mm) of precipitation.
What is the month with the shortest days in Illinois City?
December has the shortest days of the year, with an average of 9h and 12min of daylight.
Average temperature
Illinois City, IL
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure
Illinois City, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.12"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.93"Hg - Average pressure in May:
29.94"Hg - Average pressure in June:
29.9"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:
30.01"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.11"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed
Illinois City, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.3mph - Average wind speed in April:
10.6mph - Average wind speed in May:
9mph - Average wind speed in June:
7.8mph
- Average wind speed in July:
6.8mph - Average wind speed in August:
6.7mph - Average wind speed in September:
7.8mph - Average wind speed in October:
9.6mph - Average wind speed in November:
10.3mph - Average wind speed in December:
9.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity
Illinois City, IL
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Illinois City, IL
- Average rainfall in January:
0.79" - Average rainfall in February:
0.79" - Average rainfall in March:
1.1" - Average rainfall in April:
2.01" - Average rainfall in May:
3.31" - Average rainfall in June:
2.8"
The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is December (0.75").
Average rainfall days
Illinois City, IL
- Average rainfall days in January:
4.2 days - Average rainfall days in February:
4.3 days - Average rainfall days in March:
9.8 days - Average rainfall days in April:
14.3 days - Average rainfall days in May:
16.5 days - Average rainfall days in June:
17 days
- Average rainfall days in July:
15 days - Average rainfall days in August:
12.3 days - Average rainfall days in September:
9.5 days - Average rainfall days in October:
11.1 days - Average rainfall days in November:
7.4 days - Average rainfall days in December:
6.6 days
The month with the highest number of rainy days is June (17 days).
The month with the least rainy days is January (4.2 days).
Average snowfall
Illinois City, 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
Illinois City, IL
- Average snowfall days in January:
10.3 days - Average snowfall days in February:
8.8 days - Average snowfall days in March:
4.2 days - Average snowfall days in April:
1.4 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:
0.7 days - Average snowfall days in November:
2.2 days - Average snowfall days in December:
7.8 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Illinois City, 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 3min - Average daylight in June:
15h and 1min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 5min - Average daylight in September:
12h and 3min - Average daylight in October:
11h and 1min - Average daylight in November:
9h and 5min - Average daylight in December:
9h and 1min
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 12min).
- Average sunshine in January:
4h and 0min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 3min - Average sunshine in April:
7h and 5min - Average sunshine in May:
8h and 5min - Average sunshine in June:
9h and 5min
- Average sunshine in July:
10h and 2min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 2min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days
Illinois City, IL
- Average sunshine days in January:
17.8 days - Average sunshine days in February:
15.5 days - Average sunshine days in March:
17.2 days - Average sunshine days in April:
13.4 days - Average sunshine days in May:
10.9 days - Average sunshine days in June:
10.8 days
- Average sunshine days in July:
11.9 days - Average sunshine days in August:
15.5 days - Average sunshine days in September:
18.5 days - Average sunshine days in October:
17.5 days - Average sunshine days in November:
19.6 days - Average sunshine days in December:
18.6 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is June (10.8 days).
Average UV index
Illinois City, IL
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Illinois City, IL
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Illinois City, 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).
Illinois City, Illinois, USA
Weather forecast for your location
1. Click Locate me button
2. Allow the app to use your location
2. Allow the app to use your location
