South Wilmington, IL Climate


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United States / Illinois / Chicago-Naperville-Elgin Metro Area / Grundy County / South Wilmington / Zip Codes
South Wilmington, IL has a humid continental climate. Summers are hot and humid, with temperatures reaching the mid-80sF (29C). Winters are cold and snowy, with temperatures dropping below freezing for parts of the season. Precipitation is common throughout the year, with most of it in the form of rain during the warmer months and snow during winter. The area is known for its thunderstorms in late spring and early summer. Spring and autumn offer milder weather, perfect for outdoor activities such as hiking or biking.

South Wilmington, Illinois gets 37 inches of rain, on average, per year. The US average is 38 inches of rain per year.

South Wilmington averages 22 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 187 sunny days per year in South Wilmington. The US average is 205 sunny days.

South Wilmington gets some kind of precipitation, on average, 109 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 15
Rain: averages 37 inches of rain a year
Snow: averages 22 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for South Wilmington is 7.0 (10=best), which means it is about average compared to other places in Illinois.

8.8 Summer - 4.8 Winter
June, September and August are the most pleasant months in South Wilmington, while January and December are the least comfortable months.

  ClimateSouth Wilmington, IllinoisUnited States
  37.0 in.38.1 in.
  22.1 in.27.8 in.
  109.0 days106.2 days
  187 days205 days
  84.3°85.8°
  14.8°21.7°
  77
  3.54.3
  587 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 South Wilmington with an average high temperature of 84.3°, which ranks it as cooler than most places in Illinois. In South Wilmington, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for South Wilmington are September, June and August.
In South Wilmington, there are 15.1 days annually when the high temperature is over 90°, which is cooler than most places in Illinois.
January has the coldest nighttime temperatures for South Wilmington with an average of 14.8°. This is colder than most places in Illinois.
In South Wilmington, there are 130.7 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Illinois.
In South Wilmington, there are 9.1 days annually when the nighttime low temperature falls below zero°, which is colder than most places in Illinois.
The humidity is usually comfortable in South Wilmington 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 South Wilmington with 4.4 inches of rain, and the driest month is February with 1.6 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 37.0 inches in South Wilmington means that it is drier than most places in Illinois.
May is the rainiest month in South Wilmington with 11.1 days of rain, and September is the driest month with only 7.4 rainy days. There are 109.0 rainy days annually in South Wilmington, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 22.1 inches in South Wilmington means that it is about average compared to other places in Illinois. January is the snowiest month in South Wilmington with 6.9 inches of snow, and 6 months of the year have significant snowfall.
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