St. Jacob, IL Climate


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United States / Illinois / St. Louis Metro Area / Madison County / St. Jacob / Zip Codes
St. Jacob, IL has a humid continental climate, which is typical for much of the Midwest region. Summers are typically hot and humid, with temperatures reaching as high as 90 degrees Fahrenheit (32 degrees Celsius). Winters can be cold and snowy with temperatures reaching down to 0 degrees Fahrenheit (-18 degrees Celsius) or lower. The area receives a moderate amount of precipitation throughout the year, with rain showers in the spring and fall months and snow during the winter months.

St. Jacob, Illinois gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Jacob averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 204 sunny days per year in St. Jacob. The US average is 205 sunny days.

St. Jacob gets some kind of precipitation, on average, 95 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 44 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

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

7.3 Summer - 5.7 Winter
September, May and October are the most pleasant months in St. Jacob, while January and December are the least comfortable months.

  ClimateSt. Jacob, IllinoisUnited States
  43.6 in.38.1 in.
  11.5 in.27.8 in.
  95.3 days106.2 days
  204 days205 days
  89.2°85.8°
  21.9°21.7°
  7.27
  4.14.3
  515 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 St. Jacob with an average high temperature of 89.2°, which ranks it as one of the hottest places in Illinois. In St. Jacob, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for St. Jacob are May, September and June.
In St. Jacob, there are 39.4 days annually when the high temperature is over 90°, which is one of the hottest places in Illinois.
January has the coldest nighttime temperatures for St. Jacob with an average of 21.9°. This is warmer than most places in Illinois.
In St. Jacob, there are 97.9 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Illinois.
In St. Jacob, there are 2.0 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 St. Jacob 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. Jacob.
May is the wettest month in St. Jacob with 4.9 inches of rain, and the driest month is January with 2.5 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 43.6 inches in St. Jacob means that it is wetter than most places in Illinois.
May is the rainiest month in St. Jacob with 10.7 days of rain, and February is the driest month with only 6.5 rainy days. There are 95.3 rainy days annually in St. Jacob, 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 11.5 inches in St. Jacob means that it is less snowy than most places in Illinois. January is the snowiest month in St. Jacob with 3.9 inches of snow, and 4 months of the year have significant snowfall.
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