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Köppen climate types of Illinois, using 1991-2020 climate normals. Illinois has a continental climate, with large temperature extremes not moderated by either mountains or oceans. Weather is influenced primarily by cold Canadian Arctic air in the winter, and warm, humid air from the Gulf of Mexico in the summer. High temperatures in the south ...
Illinois averages around 50 days of thunderstorm activity a year which put it somewhat above average for number of thunderstorm days for the United States. Illinois is vulnerable to tornadoes with an average of 54 occurring annually, which puts much of the state at around 9.7 tornadoes per 10,000 square miles (30,000 km 2) annually.
The January 5–6, 2025 United States blizzard was a significant and expansive winter weather event that produced blizzard conditions across the High Plains, [3] as well as a long swath of accumulating snow and and ice storm to the eastern half of the United States in early January 2025.
Severe weather, including tornadoes, is common during the spring and summer months. [10] Rare blizzards can happen in parts of central Illinois in winter. The weather of central Illinois affects the crop season as well; droughts can sometimes happen in the summer and fall causing harm to the soybean and corn crops.
The National Weather Service has issued a Winter Storm Warning across much of central Indiana. (9:03 a.m. ET) More than 100 Flights Canceled At St. Louis Airport
Illinois 2020 Population Density Map. Illinois is the most populous state in the Midwest region. Chicago, the third-most populous city in the United States, is the center of the Chicago metropolitan area or Chicagoland, as this area is nicknamed.
Sunday night, the storm's wintry weather will have spread as far east as the mid-Atlantic region, including Baltimore, Pittsburgh and Washington, D.C., leading to increasingly hazardous travel.
Illinois Department of Transportation officials expect 100,000 to 200,000 people to descend on the southern Illinois region, a prime viewing spot for Monday's solar phenomenon.