Petersburg, IL Climate


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Petersburg, IL has a humid continental climate with four distinct seasons. Summers are hot and humid while winters are cold and snowy. Spring brings warmer temperatures and blooming flowers while autumn brings cooler temperatures and beautiful foliage. The average annual temperature is 50°F (10°C), with an average high of 65°F (18°C) in summer and an average low of 29°F (-2°C) in winter. Precipitation is evenly distributed throughout the year, with the most occurring in late spring or early summer.

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

Petersburg averages 17 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 200 sunny days per year in Petersburg. The US average is 205 sunny days.

Petersburg gets some kind of precipitation, on average, 102 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 85 degrees
Winter Low: the January low is 18
Rain: averages 38 inches of rain a year
Snow: averages 17 inches of snow a year


Bestplaces Comfort Index

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

8.4 Summer - 5.2 Winter
September, June and May are the most pleasant months in Petersburg, while January and December are the least comfortable months.

  ClimatePetersburg, IllinoisUnited States
  37.8 in.38.1 in.
  17.0 in.27.8 in.
  102.2 days106.2 days
  200 days205 days
  85.1°85.8°
  18.3°21.7°
  7.27
  3.94.3
  512 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 Petersburg with an average high temperature of 85.1°, which ranks it as about average compared to other places in Illinois. In Petersburg, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Petersburg are September, May and June.
In Petersburg, there are 17.7 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 Petersburg with an average of 18.3°. This is warmer than most places in Illinois.
In Petersburg, there are 116.3 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Illinois.
In Petersburg, 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 Petersburg 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 Petersburg.
May is the wettest month in Petersburg with 4.3 inches of rain, and the driest month is January with 1.8 inches. The wettest season is Autumn with 31% of yearly precipitation and 16% occurs in Spring, which is the driest season. The annual rainfall of 37.8 inches in Petersburg means that it is drier than most places in Illinois.
May is the rainiest month in Petersburg with 11.0 days of rain, and February is the driest month with only 6.7 rainy days. There are 102.2 rainy days annually in Petersburg, 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 17.0 inches in Petersburg means that it is less snowy than most places in Illinois. January is the snowiest month in Petersburg with 5.3 inches of snow, and 5 months of the year have significant snowfall.
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