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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, in Tennessee, Illinois, is another subzero cold winter month, with an average temperature varying between 31.1°F (-0.5°C) and 19°F (-7.2°C). Tennessee notes the coldest temperatures in January, with a high average of 31.1°F (-0.5°C) and a low of 19°F (-7.2°C). Weather in January »
Weather in February
February, the last month of the winter in Tennessee, is a cold month, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 36.1°F (2.3°C). During February, the average high-temperature is a cold 36.1°F (2.3°C), maintaining a close resemblance to that of the preceding month. Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Tennessee, Illinois, with an average temperature ranging between max 49.6°F (9.8°C) and min 34.3°F (1.3°C). The shift into March is characterized by a rise in the average high-temperature, transitioning from February's wintry 36.1°F (2.3°C) to a frosty 49.6°F (9.8°C). Weather in March »
Weather in April
April in Tennessee, Illinois, is a comfortable spring month, with an average temperature ranging between min 44.2°F (6.8°C) and max 61.3°F (16.3°C). Tennessee in April experiences an increase in the average high-temperature, moving from March's frosty 49.6°F (9.8°C) to a refreshing 61.3°F (16.3°C). Weather in April »
Weather in May
May, the last month of the spring in Tennessee, is an agreeable month, with an average temperature ranging between min 54.9°F (12.7°C) and max 71.6°F (22°C). May's arrival brings a temperature shift, moving from a comfortable 61.3°F (16.3°C) in April to a pleasant 71.6°F (22°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Tennessee, Illinois, with an average temperature fluctuating between 80.4°F (26.9°C) and 63.7°F (17.6°C). The onset of June brings a minor temperature shift, with the average high-temperature moving from a pleasant 71.6°F (22°C) in May to a moderately hot 80.4°F (26.9°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Tennessee, Illinois, with an average temperature ranging between max 82.6°F (28.1°C) and min 66.2°F (19°C). July, noted for its average high-temperature of 82.6°F (28.1°C) and an average low-temperature of 66.2°F (19°C), is considered the warmest month. The heat index for July is evaluated at a tropical 91.4°F (33°C). Weather in July »
Weather in August
August, the last month of the summer in Tennessee, is also a moderately hot month, with temperature in the range of an average low of 63.7°F (17.6°C) and an average high of 82°F (27.8°C). Tennessee starts August with an average high-temperature of a still moderately hot 82°F (27.8°C), hinting at a minimal fluctuation from July. Weather in August »
Weather in September
September, the first month of the autumn in Tennessee, is still a warm month, with temperature in the range of an average low of 57.6°F (14.2°C) and an average high of 76.8°F (24.9°C). September's arrival shows an average high-temperature of a still moderately hot 76.8°F (24.9°C), hardly different from the previous month. Weather in September »
Weather in October
October, like September, in Tennessee, Illinois, is another comfortable autumn month, with temperature in the range of an average low of 46°F (7.8°C) and an average high of 63°F (17.2°C). Stepping into October, Tennessee observes a temperature decline, with the average high falling from September's warm 76.8°F (24.9°C) to an enjoyable 63°F (17.2°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Tennessee, Illinois, with an average temperature ranging between min 34.7°F (1.5°C) and max 49.1°F (9.5°C). Tennessee in November undergoes a mild reduction in the average high-temperature, shifting from October's refreshing 63°F (17.2°C) to a frosty 49.1°F (9.5°C). Weather in November »
Weather in December
December, the first month of the winter in Tennessee, is still a cold month, with temperature in the range of an average high of 37°F (2.8°C) and an average low of 25.9°F (-3.4°C). December is characterized by a reduction in the average high-temperature, from a frosty 49.1°F (9.5°C) in November to a cold 37°F (2.8°C). Weather in December »
Updated: Aug 1, 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 is the coldest time of year?
January is the coldest month, exhibiting average temperatures of 31.1°F (-0.5°C) at the peak and 19°F (-7.2°C) at the base.
How much does it rain?
In Tennessee, during the entire year, the rain falls for 94.4 days and collects up to 7.76" (197mm) of precipitation.
When does it snow?
January through April, October through December are months with snowfall.
What is the snowiest month?
The month with the most snowfall is January, when snow falls for 6.3 days and typically aggregates up to 0.67" (17mm) of snow.
How much does it snow?
Throughout the year, there are 20.5 snowfall days, and 2.44" (62mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year in Tennessee, with an average of 4.1h of sunshine.
What is the month with the lowest UV index?
January is the month with the lowest UV index, with an average maximum UV index of 1.
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.
What is the rainiest month?
The month with the most rainfall is May, when the rain falls for 12.3 days and typically aggregates up to 1.1" (28mm) of precipitation.
When it does not snow?
May through September are months without snowfall.
When are the longest days in Tennessee?
With an average of 15h and 0min of daylight, June has the longest days of the year.
What is the month with the most sunshine?
June and July, with an average of 10.2h of sunshine, are months with the most sunshine.
When is the highest UV index?
The months with the highest UV index are June through August, with an average maximum UV index of 6.
What time of the year is the hottest?
With average high temperatures of 82.6°F (28.1°C) and lows of 66.2°F (19°C), July is the warmest month.
What is the most humid month?
With an average relative humidity of 83%, July is the most humid month.
What is the least humid month?
October is the least humid month, with an average relative humidity of 71%.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 4.3 days and typically collects 0.35" (9mm) of precipitation.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Tennessee, IL
The warmest month (with the highest average high temperature) is July (82.6°F).
The month with the lowest average high temperature is January (31.1°F).
The month with the highest average low temperature is July (66.2°F).
The coldest month (with the lowest average low temperature) is January (19°F).
Average pressure
Tennessee, 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:
29.94"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:
30.02"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 (29.9"Hg).
Average wind speed
Tennessee, IL
- Average wind speed in January:
10.5mph - Average wind speed in February:
10.4mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.4mph - Average wind speed in May:
8.7mph - Average wind speed in June:
7.7mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.6mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.2mph - Average wind speed in November:
10.1mph - Average wind speed in December:
9.9mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (6.6mph).
Average humidity
Tennessee, IL
The month with the highest relative humidity is July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall
Tennessee, IL
- Average rainfall in January:
0.39" - Average rainfall in February:
0.39" - Average rainfall in March:
0.59" - Average rainfall in April:
0.79" - Average rainfall in May:
1.1" - Average rainfall in June:
0.83"
- Average rainfall in July:
0.67" - Average rainfall in August:
0.59" - Average rainfall in September:
0.87" - Average rainfall in October:
0.71" - Average rainfall in November:
0.47" - Average rainfall in December:
0.35"
The wettest month (with the highest rainfall) is May (1.1").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days
Tennessee, IL
- Average rainfall days in January:
3.3 days - Average rainfall days in February:
3.6 days - Average rainfall days in March:
8.7 days - Average rainfall days in April:
10.9 days - Average rainfall days in May:
12.3 days - Average rainfall days in June:
11.8 days
- Average rainfall days in July:
10 days - Average rainfall days in August:
8.9 days - Average rainfall days in September:
7.7 days - Average rainfall days in October:
7.5 days - Average rainfall days in November:
5.4 days - Average rainfall days in December:
4.3 days
The month with the highest number of rainy days is May (12.3 days).
The month with the least rainy days is January (3.3 days).
Average snowfall
Tennessee, IL
The month with the highest snowfall is January (0.67").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Tennessee, IL
- Average snowfall days in January:
6.3 days - Average snowfall days in February:
5.7 days - Average snowfall days in March:
2.3 days - Average snowfall days in April:
0.7 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:
1.5 days - Average snowfall days in December:
3.7 days
The month with the highest number of snowfall days is January (6.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Tennessee, 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:
15h and 0min
- 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:
9h and 5min - Average daylight in December:
9h and 2min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 3min - Average sunshine in March:
6h and 4min - Average sunshine in April:
8h and 1min - Average sunshine in May:
9h and 0min - Average sunshine in June:
10h and 1min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
9h and 2min - Average sunshine in October:
5h and 4min - Average sunshine in November:
5h and 2min - Average sunshine in December:
4h and 4min
The months with the most sunshine are June and July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days
Tennessee, IL
- Average sunshine days in January:
22.8 days - Average sunshine days in February:
20.5 days - Average sunshine days in March:
19.8 days - Average sunshine days in April:
17.5 days - Average sunshine days in May:
14.8 days - Average sunshine days in June:
13.9 days
- Average sunshine days in July:
15.3 days - Average sunshine days in August:
18.2 days - Average sunshine days in September:
20.4 days - Average sunshine days in October:
20.7 days - Average sunshine days in November:
21.8 days - Average sunshine days in December:
23.5 days
The month with the most sunshine days is December (23.5 days).
The month with the least sunshine days is June (13.9 days).
Average UV index
Tennessee, IL
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover
Tennessee, IL
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility
Tennessee, 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).
Tennessee, Illinois, USA
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