In late spring and summer, temperatures over are not uncommon, though hot, dry conditions are usually ended by a southerly buster, a powerful southerly that brings gale winds and a rapid fall in temperature. Since Sydney is downwind of the Great Dividing Range, it occasionally experiences dry, westerly foehn winds typically in winter and early spring (which are the reason for its warm maximum temperatures). Westerly winds are intense when the Roaring forties (or the Southern Annular Mode) shift towards southeastern Australia, where they may damage homes and affect flights, in addition to making the temperature seem colder than it actually is. Rainfall has a moderate to low variability and has historically been fairly uniform throughout the year, although in recent years it has been more summer-dominant and erratic. Precipitation is usually higher in late summer through to early winter and lower in late winter to early spring. In late autumn and winter, east coast lows may bring large amounts of rainfall, especially in the CBD. In the warm season black nor'easters are usually the cause of heavy rain events, though other forms of low-pressure areas, including remnants of ex-cyclones, may also bring heavy deluge and afternoon thunderstorms, particularly in the western suburbs. Snowfall was last reported in the Sydney City area in 1836, while a fall of graupel, or soft hail, in Lindfield, Roseville and Killara was mistaken by many for snow, in July 2008. In 2009, dry conditions brought a severe dust storm towards the city. Regions The regions of Sydney include the CBD or City of Sydney (colloquially referred to as 'the City') and Inner West, the Eastern Suburbs, Southern Sydney (including St George and Sutherland Shire), Greater Western Sydney (including South Western Sydney, Hills District and the Macarthur Region), and Northern Sydney (including the North Shore and Northern Beaches). The Greater Sydney Commission divides Sydney into five districts based on the 33 LGAs in the metropolitan area; the Western City, the Central City, the Eastern City, the North District, and the South District. The Australian Bureau of Statistics includes City of Central Coast (the former Gosford City and Wyong Shire) as part of Greater Sydney for population counts. This adds another 330,000 people to the metropolitan area covered by Greater Sydney Commission. Inner suburbs The CBD extends about south from Sydney Cove. It is bordered by Farm Cove within the Royal Botanic Garden to the east