{"title":"Boston: Days with min at or below -20 C, days by year","description":"Days by year for Days with min at or below -20 C in Boston.","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/boston/days-below-minus-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_le_m20c","year":1942,"days":3,"first":"1942-12-19","last":"1942-12-21","longest_streak":3},{"threshold":"tmin_le_m20c","year":1943,"days":2,"first":"1943-02-15","last":"1943-02-16","longest_streak":2},{"threshold":"tmin_le_m20c","year":1945,"days":1,"first":"1945-01-25","last":"1945-01-25","longest_streak":1},{"threshold":"tmin_le_m20c","year":1957,"days":2,"first":"1957-01-14","last":"1957-01-15","longest_streak":2},{"threshold":"tmin_le_m20c","year":1958,"days":1,"first":"1958-02-18","last":"1958-02-18","longest_streak":1},{"threshold":"tmin_le_m20c","year":1961,"days":1,"first":"1961-02-02","last":"1961-02-02","longest_streak":1},{"threshold":"tmin_le_m20c","year":1962,"days":1,"first":"1962-12-31","last":"1962-12-31","longest_streak":1},{"threshold":"tmin_le_m20c","year":1965,"days":1,"first":"1965-01-15","last":"1965-01-15","longest_streak":1},{"threshold":"tmin_le_m20c","year":1968,"days":2,"first":"1968-01-08","last":"1968-01-09","longest_streak":2},{"threshold":"tmin_le_m20c","year":1976,"days":1,"first":"1976-01-23","last":"1976-01-23","longest_streak":1},{"threshold":"tmin_le_m20c","year":1980,"days":2,"first":"1980-12-25","last":"1980-12-26","longest_streak":2},{"threshold":"tmin_le_m20c","year":1981,"days":2,"first":"1981-01-04","last":"1981-01-05","longest_streak":2},{"threshold":"tmin_le_m20c","year":1988,"days":1,"first":"1988-01-14","last":"1988-01-14","longest_streak":1},{"threshold":"tmin_le_m20c","year":1994,"days":1,"first":"1994-01-16","last":"1994-01-16","longest_streak":1},{"threshold":"tmin_le_m20c","year":2004,"days":3,"first":"2004-01-14","last":"2004-01-16","longest_streak":3},{"threshold":"tmin_le_m20c","year":2016,"days":1,"first":"2016-02-14","last":"2016-02-14","longest_streak":1},{"threshold":"tmin_le_m20c","year":2023,"days":2,"first":"2023-02-03","last":"2023-02-04","longest_streak":2}]}