Cherbourg-en-Cotentin has a temperate oceanic climate. Its maritime character causes high humidity (84%) and a strong sea wind, commonly stormy but also low seasonal variations of temperature and few days of frost (7.3).
The influence of the Gulf Stream and the mildness of the winter allow the naturalisation of many Mediterranean and exotic plants (mimosas, palms, agaves, etc.) which are present in the public and private gardens of the city, despite average insolation.
Cherbourg and Octeville-sur-Cherbourg once belonged to the deanery of La Hague, delimited by the Divette.
In 1786, a part of Equeurdreville joined Cherbourg, during the construction of the port, and then in 1802, a portion of Octeville.
(the mouth of which was located at the current exit of Port Chantereyne) and the Trottebec (from the territory of Tourlaville) gathered in the canal de retenue, along the Avenue de Paris and Rue du Val-de-Saire.
The streams of the Bucaille and the Fay, which watered the Croûte du Homet, disappeared in the 18th century during the construction of the military port.
A stopping point for prestigious transatlantic liners in the first half of the 20th century, Cherbourg was the primary goal of US troops during the invasion of Normandy in 1944.
Along with its use as a military, fishing and yachting port, it is also a cross-Channel ferry port, with routes to the English ports of Poole and Portsmouth, the Irish port of Rosslare Harbour and St Helier on Jersey.The Armorican sandstone of the Montagne du Roule is used for rubble and rockfill.Most of the many quarries, which opened in the metropolitan area for building the harbour wall, are now closed.Octeville is a former rural municipality, composed of hamlets, whose settlement extended from the 19th century and whose territory is highly urbanised since 1950, especially around the ZUP of the Provinces and the University campus.The bordering communes are Tourlaville to the east, Équeurdreville-Hainneville to the west, La Glacerie to the south and southeast, Martinvast to the south, and Nouainville and Sideville to the south-west.Limited by its geographical isolation from being a great commercial port, it is nonetheless an important shipbuilding centre, and a working-class city with a rural hinterland.