Pompei Comune Geography, Climate & Nature

Pompei occupies flat volcanic ground between a mountain and a bay. The comune covers 12.42 km² at an elevation of 14 metres, on the Campanian plain south-east of Vesuvius, and borders Torre Annunziata, Castellammare di Stabia, Boscoreale, Santa Maria la Carità and Sant'Antonio Abate.

The terrain is the reason for everything else. The Roman city was buried under 4 to 6 metres of volcanic ash and pumice in the eruption of AD 79, and the excavated area covers 64 to 67 hectares — meaning roughly a twentieth of the modern comune's entire surface is an archaeological park, sitting several metres below the level people walk on today.

It is low, flat and walkable. Unlike the Sorrentine peninsula next door, where every town is stacked on a cliff, Pompei is level ground. That is what allowed a planned nineteenth-century town to be laid out on a grid around a basilica, and what makes the walk from the shrine to the excavations an easy one.

Vesuvius is the permanent neighbour. The volcano that created the site is visible from the town and still active; the Vesuvius National Park and its crater path are a short drive north.

Pompei is classified in Italian climate zone C, with 1,131 degree-days — the band used for the mild coastal plains, and the lowest-demand heating category found in Campania outside the islands. In practice that means short, wet winters and long, hot, dry summers at 14 metres above sea level.

The weather question here is not comfort, it is the site. The excavations cover 64 to 67 hectares of stone and dust with very little shade, and the park opens at 9.00 year-round. Between June and September the usable window is the morning — which is also why the park caps admissions at 15,000 between 9.00 and 13.00 in its summer season.

Winter is genuinely a good time to come. The site shuts earlier — last entrance 15.30, closing 17.00, from 15 October to 15 March — but a cool, bright January day on an unshaded archaeological site is better than a hot August one, and the town is at its emptiest.

Rain is the one real disruption. Roman paving and volcanic dust turn slick, and much of the site has no cover at all. A wet day at Pompeii is a short day.

The archaeological park is, accidentally, a large protected green space. Sixty-four to sixty-seven hectares walled off from development has produced something unusual on a densely built coastal plain: open ground, old masonry and undisturbed soil in the middle of one of Europe's most crowded regions.

The buried soil is itself a biological archive. The Archaeological Park notes that few archaeological sites continue to yield such a huge quantity and variety of organic remains as Pompeii. Isotope analysis of those remains has shown how sheep, goats and pigs were reared here, and that legumes and cereals were a fundamental part of the diet of the city's inhabitants, alongside varied freshwater and marine resources.

Vesuvius next door is the serious habitat. The volcano's slopes carry the region's protected flora, and the national park there — not the excavations — is where a visitor interested in Campanian biodiversity should actually go.

The park's best-known residents are its dogs. Pompeii has a long-standing population of stray dogs living among the ruins, which the park has managed through adoption and care programmes rather than removal. They are habituated to visitors and generally placid; do not feed them.

Otherwise it is lizards, swifts and cats. Warm stone and sixty hectares of wall cavities make ideal lizard habitat, and the ruins hold large numbers of them through the summer. Swifts and swallows nest in the standing walls.

Nothing here is dangerous. There are no large animals and no venomous species a visitor is realistically going to meet. The hazards at Pompeii are heat, uneven paving and sun, not wildlife.