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City briefing

Round Lake

Illinois, United States · 19,000 people
Jan
Feb
Mar
Apr
May
Jun
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Aug
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The year’s records
Annual mean 10°C · wettest around April · prevailing wind SW
Warmest
26.5 °C
Coldest
-3.0 °C
Wettest
23%
Windiest
5.9 m/s
Prevailing
SW
4.9 m/s average

When this place is good five ratings · thirty-six ten-day sections · click a cell to read it

Jan
Feb
Mar
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May
Jun
Jul
Aug
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Dec

Every reading

bars actual · line feels-like, °C
-15-10-50510152025JanuaryFebruaryMarchAprilMayJuneJulyAugustSeptemberOctoberNovemberDecember-15-10-50510152025JFMAMJJASOND

The average temperature in Round Lake over the whole year is 10°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -5°C.

Month by month Round Lake climate by month: average temperatures year round · click a month to read it

MonthHighLowFeels likeChance of rainCloudWindBeing outsideSunWalking
January-2°C-5°C-8°C17%64%4.4 m/s001
February0°C-4°C-6°C15%52%4.5 m/s107
March6°C1°C0°C18%55%4.5 m/s2018
April11°C5°C6°C20%54%4.5 m/s16042
May17°C12°C15°C20%49%4.0 m/s471164
June24°C18°C23°C17%39%3.6 m/s653846
July26°C21°C27°C16%37%3.2 m/s575923
August26°C19°C26°C16%38%3.1 m/s635428
September23°C16°C21°C17%42%3.4 m/s703057
October15°C9°C12°C19%49%3.9 m/s35463
November7°C3°C2°C17%52%4.2 m/s7026
December2°C-2°C-4°C17%60%4.2 m/s006

High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.

Seasons, and the year in short Round Lake weather by season

Year round, Round Lake has days of about -2°C at their warmest in January, its coolest month, and 26°C in July, its warmest; the coolest hours of the day run from -5°C to 21°C through the year, and the average temperature over the year is 10°C around the clock. Rain is most likely around April and least likely around February. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.

Round Lake weather in winterDecember to February

High -0°CLow -4°CRain 16%

Winter in Round Lake has typical daily highs of about -0°C and lows of about -4°C, with a 16% chance of rain on a given day.

Round Lake weather in springMarch to May

High 11°CLow 6°CRain 19%

Spring in Round Lake has typical daily highs of about 11°C and lows of about 6°C, with a 19% chance of rain on a given day.

Round Lake weather in summerJune to August

High 25°CLow 19°CRain 17%

Summer in Round Lake has typical daily highs of about 25°C and lows of about 19°C, with a 17% chance of rain on a given day.

Round Lake weather in autumnSeptember to November

High 15°CLow 9°CRain 18%

Autumn in Round Lake has typical daily highs of about 15°C and lows of about 9°C, with a 18% chance of rain on a given day.

When is the rainy season in Round Lake?

Round Lake has no sharply defined rainy season: the chance of rain on a given day runs from 15% in February, the driest month, to 20% in April, the wettest.

What time of year is Round Lake windiest?

Winds in Round Lake are highest in February, averaging 4.5 m/s (16 km/h), and lightest in August, at 3.1 m/s (11 km/h). The prevailing wind is from the SW.

What is the average temperature in Round Lake year round?

The average temperature in Round Lake over the whole year is 10°C. July is the hottest month, with highs of about 26°C; January is the coldest, with lows of about -5°C.

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