{"title":"Chicago: Days at or above 30 C, days by year","description":"Days by year for Days at or above 30 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/days-above-30c/","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":"tmax_ge_30c","year":1959,"days":58,"first":"1959-05-02","last":"1959-09-22","longest_streak":12},{"threshold":"tmax_ge_30c","year":1960,"days":32,"first":"1960-04-23","last":"1960-09-08","longest_streak":6},{"threshold":"tmax_ge_30c","year":1961,"days":30,"first":"1961-05-13","last":"1961-09-11","longest_streak":7},{"threshold":"tmax_ge_30c","year":1962,"days":36,"first":"1962-05-14","last":"1962-10-15","longest_streak":6},{"threshold":"tmax_ge_30c","year":1963,"days":37,"first":"1963-05-08","last":"1963-10-06","longest_streak":9},{"threshold":"tmax_ge_30c","year":1964,"days":40,"first":"1964-05-18","last":"1964-09-10","longest_streak":10},{"threshold":"tmax_ge_30c","year":1965,"days":19,"first":"1965-05-01","last":"1965-09-19","longest_streak":5},{"threshold":"tmax_ge_30c","year":1966,"days":44,"first":"1966-06-04","last":"1966-09-13","longest_streak":8},{"threshold":"tmax_ge_30c","year":1967,"days":15,"first":"1967-05-26","last":"1967-10-04","longest_streak":4},{"threshold":"tmax_ge_30c","year":1968,"days":36,"first":"1968-06-05","last":"1968-09-03","longest_streak":7},{"threshold":"tmax_ge_30c","year":1969,"days":26,"first":"1969-05-27","last":"1969-08-31","longest_streak":9},{"threshold":"tmax_ge_30c","year":1970,"days":40,"first":"1970-04-29","last":"1970-09-21","longest_streak":7},{"threshold":"tmax_ge_30c","year":1971,"days":53,"first":"1971-05-17","last":"1971-10-02","longest_streak":10},{"threshold":"tmax_ge_30c","year":1972,"days":33,"first":"1972-05-20","last":"1972-08-31","longest_streak":6},{"threshold":"tmax_ge_30c","year":1973,"days":32,"first":"1973-06-08","last":"1973-09-03","longest_streak":5},{"threshold":"tmax_ge_30c","year":1974,"days":20,"first":"1974-06-20","last":"1974-09-19","longest_streak":3},{"threshold":"tmax_ge_30c","year":1975,"days":38,"first":"1975-05-18","last":"1975-10-13","longest_streak":6},{"threshold":"tmax_ge_30c","year":1976,"days":35,"first":"1976-06-07","last":"1976-09-08","longest_streak":8},{"threshold":"tmax_ge_30c","year":1977,"days":48,"first":"1977-04-17","last":"1977-09-04","longest_streak":10},{"threshold":"tmax_ge_30c","year":1978,"days":33,"first":"1978-05-26","last":"1978-09-20","longest_streak":7},{"threshold":"tmax_ge_30c","year":1979,"days":38,"first":"1979-05-08","last":"1979-09-12","longest_streak":6},{"threshold":"tmax_ge_30c","year":1980,"days":43,"first":"1980-04-22","last":"1980-09-20","longest_streak":11},{"threshold":"tmax_ge_30c","year":1981,"days":26,"first":"1981-03-31","last":"1981-09-10","longest_streak":8},{"threshold":"tmax_ge_30c","year":1982,"days":28,"first":"1982-05-05","last":"1982-10-06","longest_streak":6},{"threshold":"tmax_ge_30c","year":1983,"days":59,"first":"1983-06-11","last":"1983-10-02","longest_streak":15},{"threshold":"tmax_ge_30c","year":1984,"days":38,"first":"1984-05-18","last":"1984-09-19","longest_streak":10},{"threshold":"tmax_ge_30c","year":1985,"days":30,"first":"1985-04-19","last":"1985-09-19","longest_streak":4},{"threshold":"tmax_ge_30c","year":1986,"days":34,"first":"1986-03-29","last":"1986-09-27","longest_streak":6},{"threshold":"tmax_ge_30c","year":1987,"days":58,"first":"1987-04-20","last":"1987-09-27","longest_streak":10},{"threshold":"tmax_ge_30c","year":1988,"days":63,"first":"1988-05-28","last":"1988-09-18","longest_streak":13},{"threshold":"tmax_ge_30c","year":1989,"days":27,"first":"1989-05-24","last":"1989-09-08","longest_streak":7},{"threshold":"tmax_ge_30c","year":1990,"days":29,"first":"1990-04-24","last":"1990-09-10","longest_streak":4},{"threshold":"tmax_ge_30c","year":1991,"days":60,"first":"1991-05-13","last":"1991-09-15","longest_streak":8},{"threshold":"tmax_ge_30c","year":1992,"days":15,"first":"1992-05-01","last":"1992-08-25","longest_streak":3},{"threshold":"tmax_ge_30c","year":1993,"days":29,"first":"1993-05-09","last":"1993-08-30","longest_streak":5},{"threshold":"tmax_ge_30c","year":1994,"days":41,"first":"1994-04-26","last":"1994-09-16","longest_streak":7},{"threshold":"tmax_ge_30c","year":1995,"days":58,"first":"1995-06-06","last":"1995-09-05","longest_streak":12},{"threshold":"tmax_ge_30c","year":1996,"days":23,"first":"1996-05-17","last":"1996-09-05","longest_streak":5},{"threshold":"tmax_ge_30c","year":1997,"days":30,"first":"1997-06-20","last":"1997-10-08","longest_streak":7},{"threshold":"tmax_ge_30c","year":1998,"days":45,"first":"1998-05-15","last":"1998-09-27","longest_streak":10},{"threshold":"tmax_ge_30c","year":1999,"days":45,"first":"1999-05-28","last":"1999-09-26","longest_streak":11},{"threshold":"tmax_ge_30c","year":2000,"days":24,"first":"2000-05-06","last":"2000-09-19","longest_streak":3},{"threshold":"tmax_ge_30c","year":2001,"days":42,"first":"2001-05-03","last":"2001-09-07","longest_streak":6},{"threshold":"tmax_ge_30c","year":2002,"days":48,"first":"2002-04-15","last":"2002-09-10","longest_streak":7},{"threshold":"tmax_ge_30c","year":2003,"days":26,"first":"2003-04-15","last":"2003-09-07","longest_streak":7},{"threshold":"tmax_ge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