Baku has a temperate semi-arid climate with hot and humid summers, cool and occasionally wet winters, and strong winds all year long. However, unlike many other cities with such climate features, Baku does not see extremely hot summers and substantial sunshine hours. This is largely because of its northerly latitude and the fact that it is located on a peninsula on the shore of the Caspian Sea. Baku, and the Absheron Peninsula on which it is situated, is the most arid part of Azerbaijan (precipitation here is around or less than 200 mm (8 in) a year). The majority of the light annual precipitation occurs in seasons other than summer, but none of these seasons is particularly wet.
During Soviet times, Baku, with its long hours of sunshine and dry healthy climate, was a vacation destination where citizens could enjoy beaches or relax in now-dilapidated spa complexes overlooking the Caspian Sea. The city’s past as a Soviet industrial centre left it one of the most polluted cities in the world, as of 2008.
At the same time Baku is noted as a very windy city throughout the year, hence the city’s nickname the “City of Winds”, and gale-force winds, the cold northern wind khazri and the warm southern wind gilavar are typical here in all seasons. Indeed, the city is renowned for its fierce winter snow storms and harsh winds.
The speed of the khazri sometimes reaches 144 km/h (89 mph), which can cause damage to crops, trees and roof tiles.
The daily mean temperature in July and August averages 26.4 °C (79.5 °F), and there is very little rainfall during that season. During summer the khazri sweeps through, bringing desired coolness. Winter is cool and occasionally wet, with the daily mean temperature in January and February averaging 4.3 °C (39.7 °F). During winter the khazri sweeps through, driven by polar air masses; temperatures on the coast frequently drop below freezing and make it feel bitterly cold. Winter snow storms are occasional; snow usually melts within a few days after each snowfall.