Sydney is the capital city of the state of New South Wales, and the most populous city in Australia. Located on Australia’s east coast, the metropolis surrounds Sydney Harbour and extends about 80 km (50 mi) from the Pacific Ocean in the east to the Blue Mountains in the west, and about 80 km (50 mi) from the Ku-ring-gai Chase National Park and the Hawkesbury River in the north and north-west, to the Royal National Park and Macarthur in the south and south-west.
Greater Sydney consists of 658 suburbs, spread across 33 local government areas. Residents of the city are colloquially known as “Sydneysiders”. The estimated population in June 2022 was 5,297,089 the city is home to approximately 66% of the state’s population.
Under the Köppen–Geiger classification, Sydney has a humid subtropical climate (Cfa) with “warm, sometimes hot” summers and “generally mild”, to “cool” winters. The El Niño–Southern Oscillation, the Indian Ocean Dipole and the Southern Annular Mode play an important role in determining Sydney’s weather patterns: drought and bushfire on the one hand, and storms and flooding on the other, associated with the opposite phases of the oscillation in Australia. The weather is moderated by proximity to the ocean, and more extreme temperatures are recorded in the inland western suburbs.
At Sydney’s primary weather station at Observatory Hill, extreme temperatures have ranged from 45.8 °C (114.4 °F) on 18 January 2013 to 2.1 °C (35.8 °F) on 22 June 1932. An average of 14.9 days a year have temperatures at or above 30 °C (86 °F) in the central business district (CBD).
