In 1742 , Anders Celsius ( 1701 â `` 1744 ) made a â reversedâ version of the modern Celsius temperature scale . In this scale , zero was the boiling point of water and 100 was the melting point of ice . In 1742 Swedish astronomer Anders Celsius ( 1701 â `` 1744 ) originally created a `` reversed '' version of the modern Celsius temperature scale whereby zero represented the boiling point of water and one hundred represented the freezing point of water .