St. Johns, IL Climate


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United States / Illinois / No Metro Area / Perry County / St. Johns / Zip Codes
St. Johns, IL has a humid continental climate with warm summers and cold winters. The average high temperature in the summer months is around 85°F (29°C), while the lows in winter dip to an average of 20°F (-7°C). Rainfall averages around 44 inches per year, and snowfall averages around 16 inches annually. The town experiences all four seasons, though spring and fall are usually quite mild compared to the other two seasons. Humidity levels can be quite high during the summertime, making it feel much hotter than the actual temperature outside.

St. Johns, Illinois gets 46 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Johns averages 8 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 209 sunny days per year in St. Johns. The US average is 205 sunny days.

St. Johns gets some kind of precipitation, on average, 101 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 88 degrees
Winter Low: the January low is 24
Rain: averages 46 inches of rain a year
Snow: averages 8 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for St. Johns is 7.3 (10=best), which means it is one of the most pleasant places in Illinois.

7.5 Summer - 5.8 Winter
September, May and October are the most pleasant months in St. Johns, while January and December are the least comfortable months.

  ClimateSt. Johns, IllinoisUnited States
    Unlock38.1 in.
  8.1 in.  Unlock
    Unlock106.2 days
  209 days  Unlock
  88.2°85.8°
    Unlock21.7°
  7.3  Unlock
    Unlock4.3
  466 ft.  Unlock
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 St. Johns with an average high temperature of 88.2°, which ranks it as warmer than most places in Illinois. In St. Johns, there are 2 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Johns are May, September and June.
In St. Johns, there are 34.7 days annually when the high temperature is over 90°, which is hotter than most places in Illinois.
January has the coldest nighttime temperatures for St. Johns with an average of 23.8°. This is one of the warmest places in Illinois.
In St. Johns, there are 91.6 days annually when the nighttime low temperature falls below freezing, which is one of the warmest places in Illinois.
In St. Johns, there are 1.5 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 St. Johns 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 St. Johns.
May is the wettest month in St. Johns with 5.5 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Summer with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 45.5 inches in St. Johns means that it is one of the wettest places in Illinois.
May is the rainiest month in St. Johns with 11.3 days of rain, and September is the driest month with only 6.6 rainy days. There are 100.5 rainy days annually in St. Johns, which is less rainy than most places in Illinois. The rainiest season is Summer when it rains 31% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 8.1 inches in St. Johns means that it is one of the least snowy places in Illinois. December is the snowiest month in St. Johns with 2.7 inches of snow, and 4 months of the year have significant snowfall.
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