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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 another subzero cold winter month in Round Lake Beach, Illinois, with an average temperature varying between 27.5°F (-2.5°C) and 16.5°F (-8.6°C). January, with its high-temperature average of 27.5°F (-2.5°C) and a low-temperature average of 16.5°F (-8.6°C), is the coldest month. Weather in January »
Weather in February
The last month of the winter, February, is also a subzero cold month in Round Lake Beach, Illinois, with temperature in the range of an average high of 30.6°F (-0.8°C) and an average low of 18.7°F (-7.4°C). Round Lake Beach marks the start of February with an average high-temperature of a still freezing cold 30.6°F (-0.8°C), hinting at a slight fluctuation from January's 27.5°F (-2.5°C). Weather in February »
Weather in March
The first month of the spring, March, is a frosty month in Round Lake Beach, Illinois, with an average temperature fluctuating between 42.8°F (6°C) and 30.2°F (-1°C). As Round Lake Beach transitions into March, the average high-temperature is observed to rise from a freezing cold 30.6°F (-0.8°C) in February to a frosty 42.8°F (6°C). Weather in March »
Weather in April
April in Round Lake Beach, Illinois, is a cool spring month, with an average temperature ranging between min 38.8°F (3.8°C) and max 53.6°F (12°C). An upsurge in temperatures occurs as March gives way to April, with average highs shifting from a chilly 42.8°F (6°C) to a cool 53.6°F (12°C). Weather in April »
Weather in May
May, the last month of the spring in Round Lake Beach, is an enjoyable month, with temperature in the range of an average low of 49.6°F (9.8°C) and an average high of 65.3°F (18.5°C). May witnesses an increase in the average high-temperature, moving from a fresh 53.6°F (12°C) in April to a refreshing 65.3°F (18.5°C). Weather in May »
Weather in June
The first month of the summer, June, is a warm month in Round Lake Beach, Illinois, with temperature in the range of an average low of 58.8°F (14.9°C) and an average high of 74.8°F (23.8°C). The start of June brings a rise in the average high-temperature, moving from a comfortable 65.3°F (18.5°C) in May to a moderately hot 74.8°F (23.8°C). Weather in June »
Weather in July
July, the same as June, is a moderately hot summer month in Round Lake Beach, Illinois, with an average temperature ranging between min 64.4°F (18°C) and max 79.9°F (26.6°C). In Round Lake Beach, July is the warmest month, with temperatures averaging a high of 79.9°F (26.6°C) and a low of 64.4°F (18°C). Weather in July »
Weather in August
The last month of the summer, August, is also a moderately hot month in Round Lake Beach, Illinois, with an average temperature fluctuating between 78.6°F (25.9°C) and 63.1°F (17.3°C). A minimal variation is noted in Round Lake Beach's average high-temperature at the onset of August, reaching a still moderately hot 78.6°F (25.9°C) from July's 79.9°F (26.6°C). Weather in August »
Weather in September
September, the first month of the autumn in Round Lake Beach, is also an agreeable month, with temperature in the range of an average high of 72.3°F (22.4°C) and an average low of 57°F (13.9°C). September signifies a gentle decline in Round Lake Beach's average high-temperature, easing from a warm 78.6°F (25.9°C) in August to an agreeable 72.3°F (22.4°C). Weather in September »
Weather in October
October, like September, is another refreshing autumn month in Round Lake Beach, Illinois, with temperature in the range of an average low of 45.1°F (7.3°C) and an average high of 59°F (15°C). October comes with a decrease in the average high-temperature, falling from an agreeable 72.3°F (22.4°C) in September to a moderate 59°F (15°C). Weather in October »
Weather in November
November, the last month of the autumn in Round Lake Beach, is another chilly month, with an average temperature ranging between min 32.9°F (0.5°C) and max 45.1°F (7.3°C). Welcoming November, Round Lake Beach observes a shift in the average high-temperature, falling from October's moderate 59°F (15°C) to a chilly 45.1°F (7.3°C). Weather in November »
Weather in December
The first month of the winter, December, is still a cold month in Round Lake Beach, Illinois, with an average temperature ranging between min 23.9°F (-4.5°C) and max 33.6°F (0.9°C). As Round Lake Beach, Illinois, enters December, the average high-temperature decreases from the a chilly 45.1°F (7.3°C) of November to a wintry 33.6°F (0.9°C). Weather in December »
Updated: Aug 5, 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?
January is the month that records the lowest temperatures, with averages ranging from a high of 27.5°F (-2.5°C) to a low of 16.5°F (-8.6°C).
What is the most humid month?
The months with the highest humidity are January and February, with an average relative humidity of 83%.
How many days does it rain?
Throughout the year, there are 142.3 rainfall days, and 21.97" (558mm) of precipitation is accumulated.
When does it snow?
Months with snowfall are January through May, October through December.
When does it snow the most?
January is the month with the most snowfall. Snow falls for 13.7 days and accumulates 3.58" (91mm) of snow.
How much does it snow?
Throughout the year, there are 49.5 snowfall days, and 13.54" (344mm) of snow is accumulated.
What is the month with the least sunshine?
January has the least sunshine of the year, with an average of 3.7h of sunshine.
When is the lowest UV index in Round Lake Beach?
January and December, with an average maximum UV index of 1, are months with the lowest UV index.
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 wettest month?
The month with the most rainfall is April, when the rain falls for 14.8 days and typically aggregates up to 2.72" (69mm) of precipitation.
When it does not snow?
In Round Lake Beach, snow does not fall in June through September.
When are the longest days?
With an average of 15h and 12min of daylight, June has the longest days of the year in Round Lake Beach.
What is the hottest time of year?
July, marked by an average high-temperature of 79.9°F (26.6°C) and a low-temperature of 64.4°F (18°C), is the warmest month in Round Lake Beach.
What is the month with the highest UV index?
The months with the highest UV index are July and August, with an average maximum UV index of 6.
What month has the most sunshine?
The month with the most sunshine is August, with an average of 10.2h of sunshine.
What is the least humid month?
The least humid month is October, with an average relative humidity of 74%.
What is the driest month?
The month with the least rainfall is December, when the rain falls for 8.2 days and typically collects 0.98" (25mm) of precipitation.
What is the month with the shortest days?
With an average of 9h and 6min of daylight, December has the shortest days of the year.
Average temperature
Round Lake Beach, IL
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27.5°F).
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (16.5°F).
Average pressure
Round Lake Beach, IL
- Average pressure in January:
30.1"Hg - Average pressure in February:
30.1"Hg - Average pressure in March:
30.09"Hg - Average pressure in April:
29.96"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:
29.98"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 months with the highest atmospheric pressure are January and February (30.1"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed
Round Lake Beach, IL
- Average wind speed in January:
10.4mph - Average wind speed in February:
10.3mph - Average wind speed in March:
9.8mph - Average wind speed in April:
9.9mph - Average wind speed in May:
8.4mph - Average wind speed in June:
7.4mph
- Average wind speed in July:
6.6mph - Average wind speed in August:
6.4mph - Average wind speed in September:
7.5mph - Average wind speed in October:
9.1mph - Average wind speed in November:
9.8mph - Average wind speed in December:
9.6mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity
Round Lake Beach, IL
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall
Round Lake Beach, IL
- Average rainfall in January:
1.14" - Average rainfall in February:
1.22" - Average rainfall in March:
1.18" - Average rainfall in April:
2.72" - Average rainfall in May:
2.44" - Average rainfall in June:
2.6"
- Average rainfall in July:
2.48" - Average rainfall in August:
2.64" - Average rainfall in September:
1.57" - Average rainfall in October:
1.89" - Average rainfall in November:
1.1" - Average rainfall in December:
0.98"
The wettest month (with the highest rainfall) is April (2.72").
The driest month (with the least rainfall) is December (0.98").
Average rainfall days
Round Lake Beach, IL
- Average rainfall days in January:
5.4 days - Average rainfall days in February:
5 days - Average rainfall days in March:
10.1 days - Average rainfall days in April:
14.8 days - Average rainfall days in May:
17 days - Average rainfall days in June:
15.7 days
- Average rainfall days in July:
17.5 days - Average rainfall days in August:
16 days - Average rainfall days in September:
11.9 days - Average rainfall days in October:
13.2 days - Average rainfall days in November:
7.5 days - Average rainfall days in December:
8.2 days
The month with the highest number of rainy days is July (17.5 days).
The month with the least rainy days is February (5 days).
Average snowfall
Round Lake Beach, IL
- Average snowfall in January:
3.58" - Average snowfall in February:
3.54" - Average snowfall in March:
1.22" - Average snowfall in April:
1.61" - Average snowfall in May:
0.04" - Average snowfall in June:
0"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days
Round Lake Beach, IL
- Average snowfall days in January:
13.7 days - Average snowfall days in February:
10.7 days - Average snowfall days in March:
7.1 days - Average snowfall days in April:
2.5 days - Average snowfall days in May:
0.2 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:
4.4 days - Average snowfall days in December:
10.4 days
The month with the highest number of snowfall days is January (13.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight / Average sunshine
Round Lake Beach, 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 0min - 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 6min).
- Average sunshine in January:
3h and 4min - Average sunshine in February:
3h and 5min - Average sunshine in March:
5h and 5min - Average sunshine in April:
7h and 4min - Average sunshine in May:
8h and 3min - Average sunshine in June:
9h and 4min
- Average sunshine in July:
10h and 1min - Average sunshine in August:
10h and 1min - Average sunshine in September:
8h and 5min - Average sunshine in October:
5h and 3min - Average sunshine in November:
5h and 0min - Average sunshine in December:
4h and 0min
The month with the most sunshine is August (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days
Round Lake Beach, IL
- Average sunshine days in January:
13.7 days - Average sunshine days in February:
12.3 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
11.6 days - Average sunshine days in May:
10.8 days - Average sunshine days in June:
11.7 days
- Average sunshine days in July:
11.1 days - Average sunshine days in August:
11.7 days - Average sunshine days in September:
15.1 days - Average sunshine days in October:
14.7 days - Average sunshine days in November:
17.1 days - Average sunshine days in December:
15.4 days
The month with the most sunshine days is November (17.1 days).
The month with the least sunshine days is May (10.8 days).
Average UV index
Round Lake Beach, IL
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Round Lake Beach, IL
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are July, August and September (Cloud cover 30).
Average visibility
Round Lake Beach, IL
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
Round Lake Beach, Illinois, USA
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