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Downtown Chicago, showing Lake Michigan in the foreground. The climate of Chicago is classified as hot-summer humid continental (Köppen: Dfa) with hot humid summers and cold, occasionally snowy winters. All four seasons are distinctly represented: Winters are cold and often see snow with below 0 Celsius temperatures and windchills, while ...
Chicago's present natural geography is a result of the large glaciers of the Ice Age, namely the Wisconsinan Glaciation that carved out the modern basin of Lake Michigan (which formed from the glacier's meltwater). The city of Chicago itself sits on the Chicago Plain, a flat plain that was once the bottom of ancestral Lake Chicago. This plain ...
Climate data for Chicago (O'Hare Int'l Airport), 1991–2020 normals, [a] extremes 1871–present [b]Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year Record high °F (°C)
Under Köppen, Chicago is classified as a humid continental climate (Dfa). Deep within continents, cities like Chicago are defined by huge temperature swings from cold, snowy winters to warm summers.
The Chicago Climate Exchange (CCX) was a voluntary, legally binding greenhouse gas reduction and trading system for emission sources and offset projects in North America and Brazil. CCX employed independent verification, included six greenhouse gases, and traded greenhouse gas emission allowances from 2003 to 2010.
January 20, 1985 holds the record for Chicago's coldest day, with temperatures dropping as low as -27 degrees.
The 1995 Chicago heat wave was one of the worst weather-related disasters in state history, with 525 dead within a five-day period as overnight lows remained as high as 84 °F (28.9 °C) and daytime highs reached up to 106 °F (41.1 °C). [6]
“It was also the hottest spring day in Chicago weather history, because summer does not begin until noon today, and the warmest day of this year, exceeding Friday’s 101.8 degrees.