Climate Chicago
the city lies within humid continental climate zone (köppen: dfa), , experiences 4 distinct seasons. summers warm hot , humid, july daily average of 75.8 °f (24.3 °c). in normal summer, temperatures can exceed 90 °f (32 °c) many 21 days. winters cold , snowy few sunny days, , normal january high below freezing. spring , autumn mild seasons low humidity. dewpoint temperatures in summer range 55.7 °f (13.2 °c) in june 61.7 °f (16.5 °c) in july. city part of usda plant hardiness zone 6a, transitioning 5b in suburbs.
according national weather service, chicago s highest official temperature reading of 105 °f (41 °c) recorded on july 24, 1934, although midway airport reached 109 °f (43 °c) 1 day prior , recorded heat index of 125 °f (52 °c) during 1995 heatwave. lowest official temperature of −27 °f (−33 °c) recorded on january 20, 1985, @ o hare airport. city can experience extreme winter cold waves , summer heat waves may last several consecutive days. thunderstorms common during spring , summer months may produce hail, high winds, , tornadoes. other major cities, chicago experiences urban heat island, making city , suburbs milder surrounding rural areas, @ night , in winter. also, proximity lake michigan keeps lakefront chicago cooler in summer , milder in winter areas west.
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