Caseyville, IL Climate


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United States / Illinois / St. Louis Metro Area / St. Clair County / Caseyville / Zip Codes
Caseyville, IL enjoys a temperate climate that is typical of the Midwest United States. The summers are hot and humid with daily temperatures typically ranging from the high 70s to mid 80s Fahrenheit. Winters in Caseyville can be quite cold, with temperatures often dropping to below freezing and snowfall common. Spring and fall seasons bring mild weather with comfortable temperatures that range between the mid 40s and mid 70s. Overall, Caseyville is an ideal place for those who enjoy milder climates without extreme temperature variations between seasons.

Caseyville, Illinois gets 43 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Caseyville averages 13 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 206 sunny days per year in Caseyville. The US average is 205 sunny days.

Caseyville gets some kind of precipitation, on average, 102 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 89 degrees
Winter Low: the January low is 22
Rain: averages 43 inches of rain a year
Snow: averages 13 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Caseyville is 7.2 (10=best), which means it is one of the most pleasant places in Illinois.

7.3 Summer - 5.7 Winter
September, May and October are the most pleasant months in Caseyville, while January and December are the least comfortable months.

  ClimateCaseyville, IllinoisUnited States
  42.8 in.38.1 in.
  13.0 in.27.8 in.
  101.5 days106.2 days
  206 days205 days
  89.3°85.8°
  22.1°21.7°
  7.27
  4.14.3
  453 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 Caseyville with an average high temperature of 89.3°, which ranks it as one of the hottest places in Illinois. In Caseyville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Caseyville are May, September and October.
In Caseyville, there are 39.6 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.
January has the coldest nighttime temperatures for Caseyville with an average of 22.1°. This is warmer than most places in Illinois.
In Caseyville, there are 101.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.
In Caseyville, there are 1.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.
The humidity can be uncomfortably heavy or close in Caseyville during the summer months. July is the most humid month, though humidity is low for most of the year. July, August and June are the three most humid months in Caseyville.
May is the wettest month in Caseyville with 4.9 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Summer with 29% of yearly precipitation and 19% occurs in Spring, which is the driest season. The annual rainfall of 42.8 inches in Caseyville means that it is wetter than most places in Illinois.
May is the rainiest month in Caseyville with 11.2 days of rain, and September is the driest month with only 6.7 rainy days. There are 101.5 rainy days annually in Caseyville, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 30% of the time and the driest is Spring with only a 22% chance of a rainy day.
An annual snowfall of 13.0 inches in Caseyville means that it is less snowy than most places in Illinois. January is the snowiest month in Caseyville with 4.1 inches of snow, and 4 months of the year have significant snowfall.
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