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This French expression has nothing to do with the Beaufort required to make our dear cattle’s horns fly away.
It references a time when horns of cattle were removed only on very windy days. The wind kept the flies at bay, thus limiting the risk of infection.
Sources:
Expressio
The french expression, in french, is :
“Un vent à décorner les boeufs”
You use it when it is quite windy