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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 Eureka, Illinois, is another subzero cold winter month, with an average temperature varying between 30.4°F (-0.9°C) and 18.5°F (-7.5°C). January is the coldest month, with an average high-temperature of 30.4°F (-0.9°C) and an average low-temperature of 18.5°F (-7.5°C). Weather in January »
Weather in February
February, the last month of the winter in Eureka, is a cold month, with an average temperature ranging between min 22.3°F (-5.4°C) and max 35.1°F (1.7°C). The advent of February observes an average high-temperature of an icy 35.1°F (1.7°C), nearly identical to January's 30.4°F (-0.9°C). Weather in February »
Weather in March
March, the first month of the spring in Eureka, is a frosty month, with temperature in the range of an average high of 48.2°F (9°C) and an average low of 33.6°F (0.9°C). March's arrival sees a rise in the average high-temperature, jumping from February's wintry 35.1°F (1.7°C) to a chilly 48.2°F (9°C). Weather in March »
Weather in April
April is a mild spring month in Eureka, Illinois, with temperature in the range of an average high of 60.4°F (15.8°C) and an average low of 44.2°F (6.8°C). The beginning of April marks a shift in the average high-temperature, moving from March's frosty 48.2°F (9°C) to a refreshing 60.4°F (15.8°C). Weather in April »
Weather in May
The last month of the spring, May, is a pleasant month in Eureka, Illinois, with temperature in the range of an average high of 71.4°F (21.9°C) and an average low of 55°F (12.8°C). May sees a temperature increase, moving from a refreshing 60.4°F (15.8°C) in April to an agreeable 71.4°F (21.9°C). Weather in May »
Weather in June
The first month of the summer, June, is a moderately hot month in Eureka, Illinois, with temperature in the range of an average high of 79.5°F (26.4°C) and an average low of 63°F (17.2°C). The start of June brings a subtle rise in the average high-temperature, moving from a pleasant 71.4°F (21.9°C) in May to a warm 79.5°F (26.4°C). Weather in June »
Weather in July
July, the same as June, is another warm summer month in Eureka, Illinois, with temperature in the range of an average high of 81.1°F (27.3°C) and an average low of 64.9°F (18.3°C). July, characterized by an average high temperature of 81.1°F (27.3°C) and a low temperature of 64.9°F (18.3°C), is generally the warmest month. During July, the heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »
Weather in August
The last month of the summer, August, is another warm month in Eureka, Illinois, with an average temperature ranging between max 80.2°F (26.8°C) and min 63.1°F (17.3°C). The initiation of August records an average high-temperature of a still warm 80.2°F (26.8°C), displaying a near consistency with the previous month. Weather in August »
Weather in September
September, the first month of the autumn in Eureka, is still a warm month, with an average temperature ranging between min 57°F (13.9°C) and max 75.7°F (24.3°C). The transition into September reveals an average high-temperature of a still warm 75.7°F (24.3°C), mirroring a close resemblance to August. Weather in September »
Weather in October
October, the same as September, is another refreshing autumn month in Eureka, Illinois, with temperature in the range of an average high of 61.9°F (16.6°C) and an average low of 46.4°F (8°C). The average high-temperature decreases in October, shifting from a moderately hot 75.7°F (24.3°C) in September to a comfortable 61.9°F (16.6°C). Weather in October »
Weather in November
The last month of the autumn, November, is also a frosty month in Eureka, Illinois, with an average temperature varying between 47.7°F (8.7°C) and 34.7°F (1.5°C). Arrival of November comes with a reduction in the average high-temperature, falling from an enjoyable 61.9°F (16.6°C) in October to a chilly 47.7°F (8.7°C). Weather in November »
Weather in December
December, the first month of the winter in Eureka, is also a wintry month, with an average temperature ranging between min 25.9°F (-3.4°C) and max 36.5°F (2.5°C). The start of December involves a temperature drop, moving from a chilly 47.7°F (8.7°C) in November to a wintry 36.5°F (2.5°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 time of the year is the coldest in Eureka?
The month of January, characterized by an average high of 30.4°F (-0.9°C) and a low of 18.5°F (-7.5°C), is recognized as the coldest.
How much does it rain in Eureka?
Throughout the year, in Eureka, there are 147.1 rainfall days, and 24.17" (614mm) of precipitation is accumulated.
When does it snow in Eureka?
Months with snowfall in Eureka, Illinois, are January through April, October through December.
When does it snow the most in Eureka?
The months with the most snowfall in Eureka, Illinois, are January and February, with an average 2.8" (71mm) of accumulated snow.
How many days does it snow in Eureka?
In Eureka, during the entire year, snow falls for 34.9 days and aggregates up to 11.65" (296mm) of snow.
What is the month with the least sunshine in Eureka?
January has the least sunshine of the year, with an average of 3.9h of sunshine.
What are the months with the lowest UV index in Eureka?
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 Eureka?
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 Eureka?
The month with the most rainfall is May, when the rain falls for 17.9 days and typically aggregates up to 3.11" (79mm) of precipitation.
When it does not snow in Eureka?
May through September are months without snowfall.
When are the longest days in Eureka?
June has the longest days of the year in Eureka, Illinois, with an average of 15h and 0min of daylight.
What month has the most sunshine in Eureka?
June has the most sunshine of the year, with an average of 10.1h of sunshine.
What are the months with the highest UV index in Eureka?
June and July, with an average maximum UV index of 6, are months with the highest UV index in Eureka.
What are the warmest months in Eureka?
Eureka's temperature records reveal July as the warmest month, marked by average highs of 81.1°F (27.3°C) and lows of 64.9°F (18.3°C).
What is the most humid month in Eureka?
July is the most humid month in Eureka, with an average relative humidity of 85%.
What is the least humid month in Eureka?
The least humid month in Eureka, Illinois, is October, with an average relative humidity of 72%.
What is the driest month in Eureka?
The month with the least rainfall is December, when the rain falls for 7.3 days and typically collects 1.22" (31mm) of precipitation.
What is the month with the shortest days in Eureka?
The month with the shortest days is December, with an average of 9h and 18min of daylight.
Average temperature
Eureka, IL
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (30.4°F).
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).
Average pressure
Eureka, IL
- Average pressure in January:
30.14"Hg - Average pressure in February:
30.11"Hg - Average pressure in March:
30.08"Hg - Average pressure in April:
29.94"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:
29.98"Hg - Average pressure in September:
30.03"Hg - Average pressure in October:
30.02"Hg - Average pressure in November:
30.11"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 (29.91"Hg).
Average wind speed
Eureka, IL
- Average wind speed in January:
10.6mph - Average wind speed in February:
10.6mph - Average wind speed in March:
10.4mph - Average wind speed in April:
10.7mph - Average wind speed in May:
9mph - Average wind speed in June:
7.9mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.5mph - Average wind speed in September:
7.6mph - Average wind speed in October:
9.4mph - Average wind speed in November:
10.2mph - Average wind speed in December:
10.1mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.5mph).
Average humidity
Eureka, IL
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall
Eureka, IL
- Average rainfall in January:
1.34" - Average rainfall in February:
1.34" - Average rainfall in March:
1.77" - Average rainfall in April:
2.87" - Average rainfall in May:
3.11" - Average rainfall in June:
2.64"
- Average rainfall in July:
2.24" - Average rainfall in August:
2.17" - Average rainfall in September:
1.81" - Average rainfall in October:
2.28" - Average rainfall in November:
1.38" - Average rainfall in December:
1.22"
The wettest month (with the highest rainfall) is May (3.11").
The driest month (with the least rainfall) is December (1.22").
Average rainfall days
Eureka, IL
- Average rainfall days in January:
5.8 days - Average rainfall days in February:
6.1 days - Average rainfall days in March:
11.8 days - Average rainfall days in April:
15.5 days - Average rainfall days in May:
17.9 days - Average rainfall days in June:
17.1 days
- Average rainfall days in July:
17.5 days - Average rainfall days in August:
15 days - Average rainfall days in September:
12.4 days - Average rainfall days in October:
11.8 days - Average rainfall days in November:
8.9 days - Average rainfall days in December:
7.3 days
The month with the highest number of rainy days is May (17.9 days).
The month with the least rainy days is January (5.8 days).
Average snowfall
Eureka, IL
The months with the highest snowfall are January and February (2.8").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days
Eureka, IL
- Average snowfall days in January:
11 days - Average snowfall days in February:
8.3 days - Average snowfall days in March:
4.5 days - Average snowfall days in April:
1.3 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:
0.4 days - Average snowfall days in November:
2.6 days - Average snowfall days in December:
6.8 days
The month with the highest number of snowfall days is January (11 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight / Average sunshine
Eureka, 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 0min
- Average daylight in July:
14h and 5min - Average daylight in August:
13h and 4min - 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 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:
3h and 5min - Average sunshine in February:
4h and 1min - Average sunshine in March:
6h and 3min - 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:
9h and 5min - Average sunshine in August:
9h and 5min - Average sunshine in September:
9h and 1min - Average sunshine in October:
5h and 5min - Average sunshine in November:
5h and 1min - Average sunshine in December:
4h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days
Eureka, IL
- Average sunshine days in January:
14.8 days - Average sunshine days in February:
13.8 days - Average sunshine days in March:
14.7 days - Average sunshine days in April:
11.6 days - Average sunshine days in May:
10.4 days - Average sunshine days in June:
10.3 days
- Average sunshine days in July:
9 days - Average sunshine days in August:
11.7 days - Average sunshine days in September:
15.8 days - Average sunshine days in October:
16.5 days - Average sunshine days in November:
18.4 days - Average sunshine days in December:
17.3 days
The month with the most sunshine days is November (18.4 days).
The month with the least sunshine days is July (9 days).
Average UV index
Eureka, IL
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover
Eureka, IL
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility
Eureka, 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).
Eureka, Illinois, USA
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