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We think of the weather forecast as a very modern service and are amazed even at the accuracy of meteorologists during the planning of D-Day in 1944. But weather forecasts have been made for centuries and those making them knew more about the science behind them than we may think. Helen Castor visits Merton College Library in Oxford, which in the fourteenth century was the Met Office of its day. She speaks to Librarian Julia Woolworth and Professor Anne Lawrence-Mathers, author of Medieval Meteorology: From Aristotle to the Almanack. First broadcast on Making History, 10 July 2018.