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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, like December, is a freezing cold winter month in Union, Illinois, with temperature in the range of an average low of 13.8°F (-10.1°C) and an average high of 26.1°F (-3.3°C). In Union, Illinois, January records the lowest average temperatures, peaking at 26.1°F (-3.3°C) and reaching a low of 13.8°F (-10.1°C). Weather in January »
Weather in February
The last month of the winter, February, is another freezing cold month in Union, Illinois, with an average temperature fluctuating between 30°F (-1.1°C) and 17.1°F (-8.3°C). Union registers an average high-temperature of a still freezing cold 30°F (-1.1°C) with the arrival of February, showing minor deviation from the preceding month. Weather in February »
Weather in March
March, the first month of the spring in Union, is a frosty month, with an average temperature varying between 29.1°F (-1.6°C) and 43.7°F (6.5°C). March brings a rise in the average high-temperature, transitioning from February's subzero cold 30°F (-1.1°C) to a frosty 43.7°F (6.5°C). Weather in March »
Weather in April
April is a mild spring month in Union, Illinois, with an average temperature ranging between min 38.8°F (3.8°C) and max 55.6°F (13.1°C). The start of April signals an increase in the average high-temperature, moving from a frosty 43.7°F (6.5°C) in March to a refreshing 55.6°F (13.1°C). Weather in April »
Weather in May
May, the last month of the spring in Union, is a comfortable month, with an average temperature ranging between min 50.2°F (10.1°C) and max 67.6°F (19.8°C). The rise of average high-temperatures is seen in May, with an increase from a mild 55.6°F (13.1°C) in April to a comfortable 67.6°F (19.8°C). Weather in May »
Weather in June
June, the first month of the summer in Union, is a warm month, with an average temperature varying between 76.5°F (24.7°C) and 59°F (15°C). Union experiences a minor temperature shift with the start of June, with average high-temperatures moving from a comfortable 67.6°F (19.8°C) in May to a moderately hot 76.5°F (24.7°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Union, Illinois, with an average temperature varying between 62.6°F (17°C) and 79.7°F (26.5°C). Union's temperature records reveal July as the warmest month, marked by average highs of 79.7°F (26.5°C) and lows of 62.6°F (17°C). Weather in July »
Weather in August
August, the last month of the summer in Union, is another warm month, with temperature in the range of an average low of 60.4°F (15.8°C) and an average high of 78.1°F (25.6°C). August's advent notes a subtle adjustment in average high-temperature to a still moderately hot 78.1°F (25.6°C) from July. Weather in August »
Weather in September
The first month of the autumn, September, is still a pleasant month in Union, Illinois, with an average temperature fluctuating between 72.1°F (22.3°C) and 54.1°F (12.3°C). The onset of September brings a small shift in high-temperatures, falling from a moderately hot 78.1°F (25.6°C) in August to a pleasant 72.1°F (22.3°C). Weather in September »
Weather in October
October, like September, is a moderate autumn month in Union, Illinois, with temperature in the range of an average high of 58.8°F (14.9°C) and an average low of 43.2°F (6.2°C). Union, Illinois, in October undergoes a mild reduction in the average high-temperature, shifting from September's agreeable 72.1°F (22.3°C) to a refreshing 58.8°F (14.9°C). Weather in October »
Weather in November
November, the last month of the autumn in Union, is another chilly month, with temperature in the range of an average high of 44.4°F (6.9°C) and an average low of 31.1°F (-0.5°C). A notable decrease in the average high-temperature is observed during November, falling from a refreshing 58.8°F (14.9°C) in October to a chilly 44.4°F (6.9°C). Weather in November »
Weather in December
December, the first month of the winter in Union, is also a wintry month, with an average temperature ranging between min 22.3°F (-5.4°C) and max 32.5°F (0.3°C). December brings a drop in Union's average high-temperature, falling from a frosty 44.4°F (6.9°C) in November to a cold 32.5°F (0.3°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
What are the coldest months in Union?
Union's coldest month, January, registers temperatures that range from a high of 26.1°F (-3.3°C) to a low of 13.8°F (-10.1°C).
What is the most humid month in Union?
With an average relative humidity of 86%, January is the most humid month.
How many days does it rain in Union?
Throughout the year, in Union, Illinois, there are 154.6 rainfall days, and 30.31" (770mm) of precipitation is accumulated.
When does it snow in Union?
January through April, October through December are months with snowfall in Union, Illinois.
When does it snow the most in Union?
January is the month with the most snowfall in Union. Snow falls for 12.3 days and accumulates 5.28" (134mm) of snow.
How many days does it snow in Union?
In Union, during the entire year, snow falls for 44.9 days and aggregates up to 17.24" (438mm) of snow.
What is the month with the least sunshine in Union?
With an average of 3.6h of sunshine, January has the least sunshine of the year.
What are the months with the lowest UV index in Union?
The months with the lowest UV index are January and December, with an average maximum UV index of 1.
What is the driest month in Union?
February and November are months with the least rain when the rain falls for 4.8 days and typically aggregates up to 1.5" (38mm) of rain.
When is Daylight Saving Time (DST) in Union?
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Union, 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 Union?
In Union, Illinois, snow does not fall in May through September.
What are the months with the highest UV index in Union?
The months with the highest UV index are May through August, with an average maximum UV index of 5.
What is the rainiest month in Union?
The month with the most rainfall in Union, Illinois, is June, when the rain falls for 18.6 days and typically aggregates up to 4.21" (107mm) of precipitation.
When are the longest days in Union?
With an average of 15h and 12min of daylight, June has the longest days of the year in Union, Illinois.
What is the hottest time of year in Union?
Union's warmest temperatures are experienced in July, with average high temperatures of 79.7°F (26.5°C) and lows of 62.6°F (17°C).
What month has the most sunshine in Union?
July has the most sunshine of the year in Union, with an average of 9.6h of sunshine.
What is the least humid month in Union?
With an average relative humidity of 76%, October is the least humid month.
What is the month with the shortest days in Union?
The month with the shortest days in Union is December, with an average of 9h and 12min of daylight.
Average temperature
Union, IL
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (26.1°F).
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (13.8°F).
Average pressure
Union, IL
- Average pressure in January:
30.11"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"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:
29.97"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30"Hg - Average pressure in November:
30.09"Hg - Average pressure in December:
30.09"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Union, IL
- Average wind speed in January:
9.7mph - Average wind speed in February:
9.8mph - Average wind speed in March:
9.5mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.3mph - Average wind speed in June:
7.3mph
- Average wind speed in July:
6.4mph - Average wind speed in August:
6.1mph - Average wind speed in September:
7.1mph - Average wind speed in October:
8.6mph - Average wind speed in November:
9.3mph - Average wind speed in December:
9.1mph
The windiest month (with the highest average wind speed) is April (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity
Union, IL
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is October (76%).
Average rainfall
Union, IL
- Average rainfall in January:
1.61" - Average rainfall in February:
1.5" - Average rainfall in March:
1.77" - Average rainfall in April:
3.54" - Average rainfall in May:
3.74" - Average rainfall in June:
4.21"
The wettest month (with the highest rainfall) is June (4.21").
The driest months (with the least rainfall) are February and November (1.5").
Average rainfall days
Union, IL
- Average rainfall days in January:
5.6 days - Average rainfall days in February:
4.8 days - Average rainfall days in March:
11.5 days - Average rainfall days in April:
16.3 days - Average rainfall days in May:
18.8 days - Average rainfall days in June:
18.6 days
- Average rainfall days in July:
19.3 days - Average rainfall days in August:
16.1 days - Average rainfall days in September:
12.8 days - Average rainfall days in October:
13.3 days - Average rainfall days in November:
9.5 days - Average rainfall days in December:
8 days
The month with the highest number of rainy days is July (19.3 days).
The month with the least rainy days is February (4.8 days).
Average snowfall
Union, IL
The month with the highest snowfall is January (5.28").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Union, IL
- Average snowfall days in January:
12.3 days - Average snowfall days in February:
10.4 days - Average snowfall days in March:
5.5 days - Average snowfall days in April:
2 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:
0.5 days - Average snowfall days in November:
4 days - Average snowfall days in December:
10.2 days
The month with the highest number of snowfall days is January (12.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Union, IL
- Average daylight in January:
9h and 3min - 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 4min - 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 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 4min - Average sunshine in March:
6h and 0min - Average sunshine in April:
7h and 2min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 3min
- Average sunshine in July:
9h and 4min - Average sunshine in August:
9h and 3min - Average sunshine in September:
8h and 3min - Average sunshine in October:
5h and 2min - Average sunshine in November:
5h and 0min - Average sunshine in December:
3h and 5min
The month with the most sunshine is July (Average sunshine: 9h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days
Union, IL
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
14.1 days - Average sunshine days in March:
15.2 days - Average sunshine days in April:
11.3 days - Average sunshine days in May:
10.6 days - Average sunshine days in June:
9.5 days
- Average sunshine days in July:
9.8 days - Average sunshine days in August:
12.3 days - Average sunshine days in September:
14.8 days - Average sunshine days in October:
16.4 days - Average sunshine days in November:
17.5 days - Average sunshine days in December:
16.5 days
The month with the most sunshine days is November (17.5 days).
The month with the least sunshine days is June (9.5 days).
Average UV index
Union, IL
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Union, IL
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are August and September (Cloud cover 35).
Average visibility
Union, IL
The months with the highest visibility are March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are January, February, July, August and September (5mi).
Union, Illinois, USA
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