Situated in a zone of transition, the concelho has several micro-climates. The Serra do Caramulo, located to the west of the city, plays an important role in climatic terms by lessening the influences of the western air masses (although the Mondego rive's basin makes the penetration easier). Consequently, Viseu's climate is characterised by the existence of high-temperature extremes, with cold and wet winters and hot and dry summers.