Chatham, IL Climate


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United States / Illinois / Springfield Metro Area / Sangamon County / Chatham / Zip Codes
Chatham, IL has a pleasant climate with four distinct seasons. Summers are hot and humid, with temperatures reaching up to 90°F (32°C) during the day and cooling off in the evening. Winters are cold, with temperatures dropping down to around 10°F (-12°C). Spring brings warm weather and blooming flowers. Fall is crisp and cool with bright foliage colors. The town receives an average of 42 inches of rain annually, making it ideal for outdoor activities throughout the year.

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

Chatham averages 19 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in Chatham. The US average is 205 sunny days.

Chatham 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 86 degrees
Winter Low: the January low is 18
Rain: averages 38 inches of rain a year
Snow: averages 19 inches of snow a year

Bestplaces Comfort Index

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

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

  ClimateChatham, IllinoisUnited States
  38.1 in.38.1 in.
  18.5 in.27.8 in.
  101.2 days106.2 days
  201 days205 days
  85.8°85.8°
  18.2°21.7°
  7.27
  3.94.3
  604 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 Chatham with an average high temperature of 85.8°, which ranks it as about average compared to other places in Illinois. In Chatham, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Chatham are September, May and June.
In Chatham, there are 20.5 days annually when the high temperature is over 90°, which is about average compared to other places in Illinois.
January has the coldest nighttime temperatures for Chatham with an average of 18.2°. This is warmer than most places in Illinois.
In Chatham, there are 116.0 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.
In Chatham, there are 5.0 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 Chatham 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 Chatham.
June is the wettest month in Chatham with 4.5 inches of rain, and the driest month is January with 1.9 inches. The wettest season is Autumn with 30% of yearly precipitation and 17% occurs in Spring, which is the driest season. The annual rainfall of 38.1 inches in Chatham means that it is drier than most places in Illinois.
May is the rainiest month in Chatham with 10.6 days of rain, and September is the driest month with only 6.7 rainy days. There are 101.2 rainy days annually in Chatham, 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 23% chance of a rainy day.
An annual snowfall of 18.5 inches in Chatham means that it is about average compared to other places in Illinois. January is the snowiest month in Chatham with 5.7 inches of snow, and 5 months of the year have significant snowfall.
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Rance · Chatham, IL
Chatham, IL weather
Over 15 years ago

Over all very good. Usually just a few severe storms and two or three heavy snow falls (8in). Seldomly snows be for Christmas. Most of the severe weather happens just  More

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