{"title":"Chicago: Tropical nights (min at or above 20 C), days by year","description":"Days by year for Tropical nights (min at or above 20 C) in Chicago.","dataAsOf":"2026-10-17T00:00:00Z","lastRevised":"2026-10-18","source":"Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products.","licence":"US Government open data (NOAA NCEI)","page":"https://worldextremeweathermonitor.com/cities/chicago/nights-above-20c/","columns":[{"name":"threshold","description":"Threshold id, for example tmax_ge_40c."},{"name":"year","description":"Calendar year."},{"name":"days","description":"Days in the year at or beyond the threshold."},{"name":"first","description":"First qualifying date of the year."},{"name":"last","description":"Last qualifying date of the year."},{"name":"longest_streak","description":"Longest run of consecutive qualifying days inside the year."}],"rows":[{"threshold":"tmin_ge_20c","year":1959,"days":40,"first":"1959-05-05","last":"1959-09-08","longest_streak":11},{"threshold":"tmin_ge_20c","year":1960,"days":24,"first":"1960-06-29","last":"1960-09-08","longest_streak":9},{"threshold":"tmin_ge_20c","year":1961,"days":16,"first":"1961-06-01","last":"1961-09-12","longest_streak":3},{"threshold":"tmin_ge_20c","year":1962,"days":11,"first":"1962-05-15","last":"1962-09-13","longest_streak":5},{"threshold":"tmin_ge_20c","year":1963,"days":8,"first":"1963-06-06","last":"1963-07-31","longest_streak":3},{"threshold":"tmin_ge_20c","year":1964,"days":14,"first":"1964-05-23","last":"1964-09-08","longest_streak":5},{"threshold":"tmin_ge_20c","year":1965,"days":8,"first":"1965-07-22","last":"1965-09-21","longest_streak":4},{"threshold":"tmin_ge_20c","year":1966,"days":12,"first":"1966-06-05","last":"1966-08-21","longest_streak":3},{"threshold":"tmin_ge_20c","year":1967,"days":10,"first":"1967-06-07","last":"1967-08-17","longest_streak":5},{"threshold":"tmin_ge_20c","year":1968,"days":24,"first":"1968-06-07","last":"1968-08-23","longest_streak":6},{"threshold":"tmin_ge_20c","year":1969,"days":29,"first":"1969-06-26","last":"1969-09-15","longest_streak":7},{"threshold":"tmin_ge_20c","year":1970,"days":35,"first":"1970-04-29","last":"1970-09-21","longest_streak":8},{"threshold":"tmin_ge_20c","year":1971,"days":31,"first":"1971-05-18","last":"1971-10-02","longest_streak":9},{"threshold":"tmin_ge_20c","year":1972,"days":29,"first":"1972-07-11","last":"1972-09-25","longest_streak":7},{"threshold":"tmin_ge_20c","year":1973,"days":35,"first":"1973-06-11","last":"1973-09-26","longest_streak":11},{"threshold":"tmin_ge_20c","year":1974,"days":11,"first":"1974-07-03","last":"1974-09-11","longest_streak":2},{"threshold":"tmin_ge_20c","year":1975,"days":36,"first":"1975-06-17","last":"1975-08-29","longest_streak":7},{"threshold":"tmin_ge_20c","year":1976,"days":14,"first":"1976-04-16","last":"1976-08-27","longest_streak":4},{"threshold":"tmin_ge_20c","year":1977,"days":32,"first":"1977-05-22","last":"1977-09-18","longest_streak":8},{"threshold":"tmin_ge_20c","year":1978,"days":20,"first":"1978-06-25","last":"1978-09-11","longest_streak":5},{"threshold":"tmin_ge_20c","year":1979,"days":27,"first":"1979-05-08","last":"1979-10-21","longest_streak":6},{"threshold":"tmin_ge_20c","year":1980,"days":31,"first":"1980-07-11","last":"1980-09-21","longest_streak":8},{"threshold":"tmin_ge_20c","year":1981,"days":13,"first":"1981-06-14","last":"1981-08-31","longest_streak":4},{"threshold":"tmin_ge_20c","year":1982,"days":13,"first":"1982-07-06","last":"1982-09-13","longest_streak":4},{"threshold":"tmin_ge_20c","year":1983,"days":32,"first":"1983-06-26","last":"1983-09-09","longest_streak":9},{"threshold":"tmin_ge_20c","year":1984,"days":9,"first":"1984-06-08","last":"1984-08-29","longest_streak":3},{"threshold":"tmin_ge_20c","year":1985,"days":9,"first":"1985-06-27","last":"1985-09-07","longest_streak":5},{"threshold":"tmin_ge_20c","year":1986,"days":15,"first":"1986-06-22","last":"1986-09-27","longest_streak":4},{"threshold":"tmin_ge_20c","year":1987,"days":30,"first":"1987-05-27","last":"1987-08-16","longest_streak":8},{"threshold":"tmin_ge_20c","year":1988,"days":30,"first":"1988-06-14","last":"1988-08-19","longest_streak":12},{"threshold":"tmin_ge_20c","year":1989,"days":16,"first":"1989-06-22","last":"1989-09-06","longest_streak":3},{"threshold":"tmin_ge_20c","year":1990,"days":21,"first":"1990-06-12","last":"1990-09-06","longest_streak":4},{"threshold":"tmin_ge_20c","year":1991,"days":22,"first":"1991-05-24","last":"1991-09-15","longest_streak":6},{"threshold":"tmin_ge_20c","year":1992,"days":6,"first":"1992-07-08","last":"1992-09-16","longest_streak":2},{"threshold":"tmin_ge_20c","year":1993,"days":21,"first":"1993-06-24","last":"1993-09-13","longest_streak":5},{"threshold":"tmin_ge_20c","year":1994,"days":18,"first":"1994-06-15","last":"1994-09-15","longest_streak":4},{"threshold":"tmin_ge_20c","year":1995,"days":48,"first":"1995-06-18","last":"1995-08-31","longest_streak":14},{"threshold":"tmin_ge_20c","year":1996,"days":12,"first":"1996-05-18","last":"1996-08-22","longest_streak":3},{"threshold":"tmin_ge_20c","year":1997,"days":17,"first":"1997-06-20","last":"1997-08-16","longest_streak":6},{"threshold":"tmin_ge_20c","year":1998,"days":28,"first":"1998-06-21","last":"1998-09-26","longest_streak":7},{"threshold":"tmin_ge_20c","year":1999,"days":28,"first":"1999-06-06","last":"1999-08-28","longest_streak":16},{"threshold":"tmin_ge_20c","year":2000,"days":13,"first":"2000-06-10","last":"2000-09-10","longest_streak":3},{"threshold":"tmin_ge_20c","year":2001,"days":27,"first":"2001-06-13","last":"2001-09-07","longest_streak":5},{"threshold":"tmin_ge_20c","year":2002,"days":34,"first":"2002-04-16","last":"2002-09-30","longest_streak":7},{"threshold":"tmin_ge_20c","year":2003,"days":14,"first":"2003-06-25","last":"2003-09-13","longest_streak":4},{"threshold":"tmin_ge_20c","year"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