Climate and monthly weather forecastRound Lake Heights, IL
Climate and monthly weather forecast
Weather in January
January, the same as December, in Round Lake Heights, Illinois, is a freezing cold winter month, with an average temperature ranging between max 27.5°F (-2.5°C) and min 16.5°F (-8.6°C). January, recording an average high temperature of 27.5°F (-2.5°C) and a low temperature of 16.5°F (-8.6°C), is Round Lake Heights's coldest month. Weather in January »Weather in February
The last month of the winter, February, is another freezing cold month in Round Lake Heights, Illinois, with an average temperature varying between 18.7°F (-7.4°C) and 30.6°F (-0.8°C). The advent of February reveals an average high-temperature of a still subzero cold 30.6°F (-0.8°C), showing minimal difference from the prior month. Weather in February »Weather in March
March, the first month of the spring in Round Lake Heights, is a frosty month, with an average temperature fluctuating between 42.8°F (6°C) and 30.2°F (-1°C). March indicates a change in the average high-temperature, moving up from a subzero cold 30.6°F (-0.8°C) in February to a frosty 42.8°F (6°C). Weather in March »Weather in April
April is a fresh spring month in Round Lake Heights, Illinois, with temperature in the range of an average low of 38.8°F (3.8°C) and an average high of 53.6°F (12°C). As April begins, there is an increase in the average high-temperature, moving from a chilly 42.8°F (6°C) in March to a cool 53.6°F (12°C). Weather in April »Weather in May
May, the last month of the spring in Round Lake Heights, is a comfortable month, with temperature in the range of an average high of 65.3°F (18.5°C) and an average low of 49.6°F (9.8°C). With the beginning of May, Round Lake Heights's average high-temperature sees an increase, transitioning from a cool 53.6°F (12°C) in April to an enjoyable 65.3°F (18.5°C). Weather in May »Weather in June
June, the first month of the summer in Round Lake Heights, is a moderately hot month, with an average temperature ranging between max 74.8°F (23.8°C) and min 58.8°F (14.9°C). As June arrives, a rise in the average high-temperature is observed, moving from a refreshing 65.3°F (18.5°C) in May to a warm 74.8°F (23.8°C). Weather in June »Weather in July
July, like June, in Round Lake Heights, Illinois, is another warm summer month, with an average temperature ranging between max 79.9°F (26.6°C) and min 64.4°F (18°C). In Round Lake Heights, 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
August, the last month of the summer in Round Lake Heights, is also a moderately hot month, with an average temperature varying between 78.6°F (25.9°C) and 63.1°F (17.3°C). August welcomes an average high-temperature of a still warm 78.6°F (25.9°C), not much different from the preceding month. Weather in August »Weather in September
September, the first month of the autumn in Round Lake Heights, is also an agreeable month, with an average temperature ranging between min 57°F (13.9°C) and max 72.3°F (22.4°C). A modest decline in the average high-temperature is seen during September, decreasing from a moderately hot 78.6°F (25.9°C) in August to an agreeable 72.3°F (22.4°C). Weather in September »Weather in October
October, the same as September, in Round Lake Heights, Illinois, is a moderate autumn month, with an average temperature varying between 45.1°F (7.3°C) and 59°F (15°C). Round Lake Heights's October weather comes with a decrease in average high-temperatures, moving from an agreeable 72.3°F (22.4°C) in September to a moderate 59°F (15°C). Weather in October »Weather in November
The last month of the autumn, November, is also a frosty month in Round Lake Heights, Illinois, with an average temperature varying between 32.9°F (0.5°C) and 45.1°F (7.3°C). November's arrival corresponds with a decrease in average high-temperatures, 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 also a wintry month in Round Lake Heights, Illinois, with an average temperature fluctuating between 23.9°F (-4.5°C) and 33.6°F (0.9°C). December brings a drop in Round Lake Heights's average high-temperature, falling from a chilly 45.1°F (7.3°C) in November to a cold 33.6°F (0.9°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
January, having an average high-temperature of 27.5°F (-2.5°C) and an average low-temperature of 16.5°F (-8.6°C), is the coldest month.
January and February, with an average relative humidity of 83%, are most humid months in Round Lake Heights.
In Round Lake Heights, Illinois, during the entire year, the rain falls for 142.3 days and collects up to 21.97" (558mm) of precipitation.
Months with snowfall are January through May, October through December.
The month with the most snowfall in Round Lake Heights, Illinois, is January, when snow falls for 13.7 days and typically aggregates up to 3.58" (91mm) of snow.
Throughout the year, in Round Lake Heights, Illinois, there are 49.5 snowfall days, and 13.54" (344mm) of snow is accumulated.
With an average of 3.7h of sunshine, January has the least sunshine of the year in Round Lake Heights, Illinois.
The months with the lowest UV index in Round Lake Heights are January and December, with an average maximum UV index of 1.
On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in Round Lake Heights, 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.
The month with the most rainfall in Round Lake Heights, Illinois, is April, when the rain falls for 14.8 days and typically aggregates up to 2.72" (69mm) of precipitation.
In Round Lake Heights, Illinois, snow does not fall in June through September.
With an average of 15h and 12min of daylight, June has the longest days of the year in Round Lake Heights, Illinois.
July, with its high-temperature average of 79.9°F (26.6°C) and a low-temperature average of 64.4°F (18°C), is the warmest month in Round Lake Heights, Illinois.
The months with the highest UV index in Round Lake Heights, Illinois, are July and August, with an average maximum UV index of 6.
August has the most sunshine of the year in Round Lake Heights, Illinois, with an average of 10.2h of sunshine.
With an average relative humidity of 74%, October is the least humid month in Round Lake Heights, Illinois.
December is the month with the least rainfall in Round Lake Heights. Rain falls for 8.2 days and accumulates 0.98" (25mm) of precipitation.
With an average of 9h and 6min of daylight, December has the shortest days of the year in Round Lake Heights.
Average temperature
Round Lake Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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 Heights, IL
- Average daylight in January:
9h and 30min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 36min - Average daylight in June:
15h and 12min
- Average daylight in July:
14h and 54min - Average daylight in August:
13h and 48min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 48min - Average daylight in December:
9h and 6min
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 42min - Average sunshine in February:
3h and 48min - Average sunshine in March:
5h and 54min - Average sunshine in April:
7h and 36min - Average sunshine in May:
8h and 30min - Average sunshine in June:
9h and 42min
- Average sunshine in July:
10h and 6min - Average sunshine in August:
10h and 12min - Average sunshine in September:
8h and 54min - Average sunshine in October:
5h and 30min - 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 Heights, 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 Heights, 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 Heights, 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 Heights, 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).
