South Jacksonville, IL Climate


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United States / Illinois / Jacksonville Metro Area / Morgan County / South Jacksonville / Zip Codes
South Jacksonville, IL has a mild climate with cold winters and hot summers. The average temperature in the winter months is between 18-30 degrees Fahrenheit while the average temperature in the summer months is between 68-86 degrees Fahrenheit. Winters generally bring snowfall and occasional blizzard conditions, while summers are warm and humid with occasional thunderstorms. Spring brings mild temperatures with frequent rain showers, while autumn brings cool evenings and dry days. Overall, South Jacksonville offers temperate weather that compliments its vibrant outdoor activities.

South Jacksonville, Illinois gets 40 inches of rain, on average, per year. The US average is 38 inches of rain per year.

South Jacksonville averages 18 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 197 sunny days per year in South Jacksonville. The US average is 205 sunny days.

South Jacksonville gets some kind of precipitation, on average, 108 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 87 degrees
Winter Low: the January low is 18
Rain: averages 40 inches of rain a year
Snow: averages 18 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for South Jacksonville is 7.1 (10=best), which means it is more comfortable than most places in Illinois.

8.1 Summer - 5.3 Winter
September, June and May are the most pleasant months in South Jacksonville, while January and December are the least comfortable months.

  ClimateSouth Jacksonville, IllinoisUnited States
  39.9 in.38.1 in.
  18.0 in.27.8 in.
  107.7 days106.2 days
  197 days205 days
  87.2°85.8°
  17.7°21.7°
  7.17
  4.24.3
  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 South Jacksonville with an average high temperature of 87.2°, which ranks it as warmer than most places in Illinois. In South Jacksonville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for South Jacksonville are September, May and June.
In South Jacksonville, there are 24.9 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.
January has the coldest nighttime temperatures for South Jacksonville with an average of 17.7°. This is about average compared to other places in Illinois.
In South Jacksonville, there are 121.9 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.
In South Jacksonville, there are 4.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Illinois.
The humidity can be uncomfortably heavy or close in South Jacksonville 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 South Jacksonville.
May is the wettest month in South Jacksonville with 4.6 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 30% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 39.9 inches in South Jacksonville means that it is wetter than most places in Illinois.
May is the rainiest month in South Jacksonville with 11.7 days of rain, and February is the driest month with only 6.6 rainy days. There are 107.7 rainy days annually in South Jacksonville, which is about average compared to other places in Illinois. The rainiest season is Summer when it rains 31% of the time and the driest is Spring with only a 20% chance of a rainy day.
An annual snowfall of 18.0 inches in South Jacksonville means that it is about average compared to other places in Illinois. January is the snowiest month in South Jacksonville with 5.5 inches of snow, and 4 months of the year have significant snowfall.
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