O Fallon, Illinois 

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Climate in O Fallon, Illinois

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

O'Fallon averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in O'Fallon. The US average is 205 sunny days.

O'Fallon gets some kind of precipitation, on average, 96 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 12 inches of snow a year


BESTPLACES COMFORT INDEX

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

7.2 / 10
September, May and October are the most pleasant months in O'Fallon, while January and December are the least comfortable months.

Climate Averages
  O'Fallon, IllinoisUnited States
  43.1 in.38.1 in.
  11.6 in.27.8 in.
  96.4 days106.2 days
  202 days205 days
  89.2°85.8°
  22.0°21.7°
  7.27
  4.14.3
  548 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 O'Fallon with an average high temperature of 89.2°, which ranks it as one of the hottest places in Illinois. In O'Fallon, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for O'Fallon are May, September and October.


January has the coldest nighttime temperatures for O'Fallon with an average of 22.0°. This is warmer than most places in Illinois.


In O'Fallon, there are 39.8 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.


In O'Fallon, there are 101.4 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.


In O'Fallon, there are 1.6 days annually when the nighttime low temperature falls below zero°, which is one of the warmest places in Illinois.


May is the wettest month in O'Fallon with 4.9 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Summer with 28% of yearly precipitation and 18% occurs in Spring, which is the driest season. The annual rainfall of 43.1 inches in O'Fallon means that it is wetter than most places in Illinois.


May is the rainiest month in O'Fallon with 10.9 days of rain, and February is the driest month with only 6.6 rainy days. There are 96.4 rainy days annually in O'Fallon, which is one of the least rainy 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 11.6 inches in O'Fallon means that it is less snowy than most places in Illinois. January is the snowiest month in O'Fallon with 3.8 inches of snow, and 4 months of the year have significant snowfall.





  • Annual Rainfall (US Avg: 36.5")
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    Reviews for O Fallon    3 Reviews
    Great Place for kids - 10/19/2008
    We are a family who moves every 3 years! This has been our favorite so far. It is easy to become a part of the community. There is always something going on for kids... Read More

    Start Your Review of O Fallon


    Quality of eduction - 5/5/2006
    The quality of education is excellent. My oldest son has ADHD and the elementary school he attends makes every provision necessary to make his education... Read More

    quality of eduation - 5/5/2006
    The quality of education is excellent. My oldest son has ADHD and the elementary school he attends makes whatever provisions are necessary to insure the highest quality... Read More


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    62269


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