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[edit] Geography[edit] TopographyFurther information: Geology of Victoria 
Map of greater Melbourne and Geelong Melbourne is located in the south-eastern part of mainland Australia, within the state of Victoria. Geologically, it is built on the confluence of Quaternary lava flows to the west, Silurian mudstones to the east, and Holocene sand accumulation to the southeast along Port Phillip. The southeastern suburbs are situated on the Selwyn fault which transects Mount Martha and Cranbourne. Melbourne extends along the Yarra River towards the Yarra Valley and the Dandenong Ranges to the east. It extends northward through the undulating bushland valleys of the Yarra's tributaries—Moonee Ponds Creek (toward Tullamarine Airport), Merri Creek, Darebin Creek and Plenty River—to the outer suburban growth corridors of Craigieburn and Whittlesea. The city sprawls south-east through Dandenong to the growth corridor of Pakenham towards West Gippsland, and southward through the Dandenong Creek valley, the Mornington Peninsula and the city of Frankston taking in the peaks of Olivers Hill, Mount Martha and Arthurs Seat, extending along the shores of Port Phillip as a single conurbation to reach the exclusive suburb of Portsea and Point Nepean. In the west, it extends along the Maribyrnong River and its tributaries north towards Sunbury and the foothills of the Macedon Ranges, and along the flat volcanic plain country towards Melton in the west, Werribee at the foothills of the You Yangs granite ridge and Geelong as part of the greater metropolitan area to the south-west. Melbourne's major bayside beaches are located in the south-eastern suburbs along the shores of Port Phillip Bay, in areas like Port Melbourne, Albert Park, St Kilda, Elwood, Brighton, Sandringham, Mentone and Frankston although there are beaches in the western suburbs of Altona and Williamstown. The nearest surf beaches are located 85 kilometres (53 mi) south-east of the Melbourne CBD in the back-beaches of Rye, Sorrento and Portsea.[79][80] [edit] ClimateFurther information: Extreme Weather Events in Melbourne 
Autumn in suburban Canterbury Melbourne has a moderate oceanic climate (Köppen climate classification Cfb)[81][82] and is well known for its changeable weather conditions. This is mainly due to Melbourne's location situated on the boundary of the very hot inland areas and the cold southern ocean. This temperature differential is most pronounced in the spring and summer months and can cause very strong cold fronts to form. These cold fronts can be responsible for all sorts of severe weather from gales to severe thunderstorms and hail, large temperature drops, and heavy rain. Port Phillip is often warmer than the surrounding oceans and/or the land mass, particularly in spring and autumn; this can set up a "bay effect" similar to the "lake effect" seen in the United States where showers are intensified leeward of the bay. Relatively narrow streams of heavy showers can often affect the same places (usually the eastern suburbs) for an extended period of time, whilst the rest of Melbourne and surrounds stays dry. Overall, Melbourne is, owing to the rain shadow of the Otway Ranges, nonetheless drier than average for southern Victoria. Within the city and surrounds, however, rainfall varies widely, from around 425 millimetres (17 in) at Little River to 1,250 millimetres (49 in) on the eastern fringe at Gembrook. Melbourne is also prone to isolated convective showers forming when a cold pool crosses the state, especially if there is considerable daytime heating. These showers are often heavy and can contain hail and squalls and significant drops in temperature, but they pass through very quickly at times with a rapid clearing trend to sunny and relatively calm weather and the temperature rising back to what it was before the shower. This occurs often in the space of minutes and can be repeated many times in a day, giving Melbourne a reputation for having "four seasons in one day",[83] a phrase that is part of local popular culture and familiar to many visitors to the city.[84] Melbourne is colder than other mainland Australian state capital cities in the winter. The lowest temperature on record is −2.8 °C (27.0 °F), on 4 July 1901.[85] However, snowfalls are rare: the most recent occurrence of sleet in the CBD was on 25 July 1986 and the most recent snowfalls in the outer eastern suburbs and Mount Dandenong were on 10 August 2005.[86][87] More commonly, Melbourne experiences frosts and fog in winter. Melbourne summers are notable for occasional days of extreme heat.[citation needed] This occurs when the synoptic pattern is conducive to the transportation of very hot air from central Australia over to the south east corner of the continent. The inland deserts of Australia are amongst the hottest areas on earth, particularly the inland parts of north-west Australia. Every summer, intense heat builds starting in the Pilbara district of Western Australia around October/November and spreading widely over the tropical and subtropical inland parts of the continent by January. In the summer months, the southern part of the continent straddles the westerly wind belt to the south and the subtropical high pressure ridge to the north. The intense heat buildup occurs where high pressure is highly dominant in the upper levels of the atmosphere over the tropics and subtropics of Australia in summer allowing for a huge area of stable atmospheric conditions to predominate. On occasion a strong cold front will develop in summer and bring the westerlies further north than their mean summer position. On these occasions, north-west winds will develop ahead of the cold front's passage and sometimes these can be very strong, even gale force. When this occurs the hot air from the inland is dragged right down over south east Australia, occasionally even as far as southern Tasmania. As this air mass is carried entirely over the continental land mass it remains unmodified, i.e. it does not pick up additional moisture from a body of water and retains most if not all of its heat. On these occasions, the normally temperate parts of southern Victoria, including Melbourne, can experience the full fury of the desert climate albeit only briefly as the cold front responsible usually passes through relatively quickly allowing cool southerly winds from the southern ocean to replace the hot desert air. The highest temperature recorded in Melbourne city was 46.4 °C (115.5 °F), on 7 February 2009.[88]
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