The 2nd century was a period of prosperity in the Mediterranean basin (the Pax Romana) and there was a need for a proper port at the head of the several valleys that lead to the Gulf able to accommodate large ships.Some important underwater archaeological discoveries recently made of Roman ships tend to confirm this.Ajaccio experienced a demographic boom in the 1960s, which explains why 85% of dwellings are post-1949.This is reflected in the layout of the city which is marked by very large areas of low-rise buildings and concrete towers, especially on the heights (Jardins de l'Empereur) and in the north of the city - e.g. A dichotomy appears in the landscape between the old city and the imposing modern buildings.After the Corsican Republic was declared in 1755 the Genoese continued to hold several citadels, including Ajaccio, until the French took control of the island.The inhabitants of the commune are known as Ajacciens or Ajacciennes.Further excavations conducted recently led to the discovery of important early Christian remains likely to significantly a reevaluation upwards of the size of Ajaccio city in Late Antiquity and the beginning of the Middle Ages.The city was in any case already significant enough to be the seat of a diocese, mentioned by Pope Gregory the Great in 591.
Other dedications to him in the city include Ajaccio Napoleon Bonaparte Airport.The annual average rainfall is 645.6 mm (25.4 in) at the Campo dell'Oro weather station (as per the chart) and 523.9 mm (20.6 in) at the Parata: the third-driest place in metropolitan France.The heat and dryness of summer are somewhat tempered by the proximity of the Mediterranean Sea except when the sirocco is blowing.Although the commune of Ajaccio has a large area (82.03 km), only a small portion of this is urbanized.
Therefore, the urban area of Ajaccio is located in the east of the commune on a narrow coastal strip forming a densely populated arc.
In autumn and spring, heavy rain-storm episodes may occur. Ajaccio is the French city which holds the record for the number of thunderstorms in the reference period 1971-2000 with an average of 39 thunderstorm days per year.