The valleys around Lake Como generate a complex wind system. The two dominant winds which sweep across the lake are the tivano which blows from a valley called “Valtellina” from the north-east in the morning and the breva which blows from the south in the afternoon. These two winds clear the sky over Lake Como but there are others that are associated with bad weather;Vento or Ventone is a northerly wind that blows in strong gusts from Val Chiavenna and can start unexpectedly. Menaggino is a southerly wind that blows in strong gusts from Val Menaggio and can be very strong during thunderstorms (particularly in summertime).
Bellasco which blows over Bellano, Argegnino blows from Val d’Intelvi, Bergamasca blows along he Lecco branch to the middle of the lake and the Garzeno which blows from the valley that overlooks Dongo; they are all summertime winds usually associated with thunderstorms and can be dangerous.
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Climate 