{"title":"Chicago: Days with min at or below -30 C, days by year","description":"Days by year for Days with min at or below -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-below-minus-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":"tmin_le_m30c","year":1982,"days":3,"first":"1982-01-10","last":"1982-01-17","longest_streak":2},{"threshold":"tmin_le_m30c","year":1983,"days":1,"first":"1983-12-24","last":"1983-12-24","longest_streak":1},{"threshold":"tmin_le_m30c","year":1984,"days":1,"first":"1984-01-21","last":"1984-01-21","longest_streak":1},{"threshold":"tmin_le_m30c","year":1985,"days":2,"first":"1985-01-19","last":"1985-01-20","longest_streak":2},{"threshold":"tmin_le_m30c","year":2019,"days":1,"first":"2019-01-30","last":"2019-01-30","longest_streak":1}]}