Jacksonville, IL Climate


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United States / Illinois / Jacksonville Metro Area / Morgan County / Jacksonville / Zip Codes
Jacksonville, IL has a humid continental climate, with hot and humid summers and cold winters. Average high temperatures in the summer range from 82°F to 90°F, while average low temperatures in the winter range from 20°F to 25°F. Precipitation is most common between April and October, with an average annual rainfall of about 42 inches. Snowfall occurs during the winter months, with an average snowfall of around 10 inches per year. Overall Jacksonville provides a mild seasonal climate that many people find enjoyable all year round.

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

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 Jacksonville. The US average is 205 sunny days.

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 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 Jacksonville, while January and December are the least comfortable months.

  ClimateJacksonville, 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
  610 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 Jacksonville with an average high temperature of 87.2°, which ranks it as warmer than most places in Illinois. In Jacksonville, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Jacksonville are September, May and June.
In 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 Jacksonville with an average of 17.7°. This is about average compared to other places in Illinois.
In 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 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 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 Jacksonville.
May is the wettest month in 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 Jacksonville means that it is wetter than most places in Illinois.
May is the rainiest month in 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 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 Jacksonville means that it is about average compared to other places in Illinois. January is the snowiest month in Jacksonville with 5.5 inches of snow, and 4 months of the year have significant snowfall.
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