Romeoville, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / Will County / Romeoville / Zip Codes
Romeoville, IL has a continental climate with hot summers and cold winters. The region is known for having mild winters with occasional snowfall. Summers are generally warm and humid with temperatures reaching into the low to mid-90's during peak times of the year. Spring and fall are mild with some precipitation throughout each season. The region experiences all four distinct seasons and average temperature range from 24°F in winter to 75°F in summer. Overall, Romeoville enjoys a comfortable climate year round that is ideal for outdoor activities.

Romeoville, Illinois gets 39 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Romeoville averages 30 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 192 sunny days per year in Romeoville. The US average is 205 sunny days.

Romeoville gets some kind of precipitation, on average, 125 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 84 degrees
Winter Low: the January low is 16
Rain: averages 39 inches of rain a year
Snow: averages 30 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Romeoville is 6.9 (10=best), which means it is less comfortable than most places in Illinois.

8.9 Summer - 4.5 Winter
June, September and August are the most pleasant months in Romeoville, while January and December are the least comfortable months.

  ClimateRomeoville, IllinoisUnited States
  39.1 in.38.1 in.
  30.1 in.27.8 in.
  124.6 days106.2 days
  192 days205 days
  83.9°85.8°
  15.7°21.7°
  6.97
  3.74.3
  620 ft.2443 ft.
Climate
YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Romeoville with an average high temperature of 83.9°, which ranks it as cooler than most places in Illinois. In Romeoville, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Romeoville are June, September and August.
In Romeoville, there are 10.5 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.
January has the coldest nighttime temperatures for Romeoville with an average of 15.7°. This is colder than most places in Illinois.
In Romeoville, there are 127.6 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.
In Romeoville, there are 6.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in Illinois.
The humidity is usually comfortable in Romeoville but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.
July is the wettest month in Romeoville with 4.6 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 33% of yearly precipitation and 15% occurs in Spring, which is the driest season. The annual rainfall of 39.1 inches in Romeoville means that it is about average compared to other places in Illinois.
May is the rainiest month in Romeoville with 12.4 days of rain, and September is the driest month with only 7.8 rainy days. There are 124.6 rainy days annually in Romeoville, which is one of the rainiest places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.
An annual snowfall of 30.1 inches in Romeoville means that it is snowier than most places in Illinois. January is the snowiest month in Romeoville with 9.8 inches of snow, and 6 months of the year have significant snowfall.
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Jay · Romeoville, IL
Dinky and Stinky
Over 12 years ago

Very near to oil refineries; little shopping and quality restaurants. Valley View Schools are not that great. Lot better communities to live. Cheap Housing though  More

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michelle · Romeoville, IL
Ok place to live
Over 14 years ago

Romeoville, nice small town feel. Very family oriented, great atmosphere to raise a family. It’s with an arms reach of more bustling towns such as Aurora, Naperville,  More

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Stephanie  · Romeoville, IL
The Best of All Worlds
Over 14 years ago

Romeoville is a short drive to the big city of Chicago with all it has to offer from shopping to museums and theater. Yet there is space for planting a yard and kids to  More

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