The latter half of May was cool and damp. At O’Hare International Airport, rain was observed on 10 of the month’s last 14 days. Thursday marked the start of the meteorological summer season. Fittingly, the day averaged 2 degrees above normal, due largely to bright sunshine. The day produced 100% of its possible sunshine, the first time that has happened since May 7th. Temperatures reached 80 degrees most areas. More 80-degree weather is on its way. Computer forecasts are in close agreement in bringing a weather system across the upper Great lakes over the upcoming weekend. This feature will draw moist, tropical air into the region by Saturday, sending temperatures into the mid 80s. The higher humidity is expected to support thunderstorm development, especially Saturday night.
June’s opening weekend to turn warm and humid

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First weekend of March brings pleasant weather
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When was the last time Chicago had 80 degrees?
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Strong winds bring a brief push of milder air
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Winter-like weather will last the weekend; Snow possible
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Chilly St. Patrick’s Day could start wintry
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Spring in sight in Chicago after historically cold April start
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Chicago rides a temperature roller coaster
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Sun, dry air sent temperatures rising Friday
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East Coast braces for a deep freeze following massive storm
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Wild weather ahead-from 60s to snow
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Sub-normal temperatures to last into next week
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How far north would match Chicago’s weather so far this April and be considered normal?
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Winter Weather Advisory in effect until 1PM CDT Sunday for glazing from freezing rain and sleet in Winnebago, Boone, McHenry and Lake Counties in northeastern Illinois