On June 15 1783, Dr John Purcell went outside his house in Edinburgh, looked up at the clouds and wrote in his diary how dark and gloomy the sky was. The dark skies, he reported, continued for seven days followed by two or three days of fine weather. Then, on June 25 he began to describe the presence of a choking sulphurous haze that lingered over Edinburgh for the rest of the summer.
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Across Scotland, others were describing similar patterns of weather. At Gordon Castle in Morayshire, similar descriptions appear in an estate diary. In Aberdeenshire, Janet Burnet was recording in her farming diary how the leaves of her crops were withering and turning yellow, while on the estate of Henry, 3rd Duke of Buccleuch near Edinburgh, daily weather conditions were being measured with a thermometer, barometer and rain gauge.