According to folklore there could be several distinct spells of good weather in autumn, each named after a saint’s day

Spells of fine autumn weather used to be known as gossamer, a contraction of “goose summer”. The name was applied because this was when geese were eaten, having been fattened up in the previous months.

These spells were notable for gossamer threads, the mass of fine spider webs which catch the sun in stubble fields on a bright autumn morning. Now gossamer is used only to describe fine threads rather than weather.

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Source: Guardian Environment