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Climate

A little more than half of the state has an arid to semi arid climate, where the rainfall averages from 150 to 500 millimetres (5.9 to 19.7 in) a year throughout most of this climate zone. Summer temperatures can be very hot, while winter nights can be quite cold in this region. Rainfall varies throughout the state. The far north-west receives the least, less than 180 mm (7 in) annually, while the east receives between 700 and 1,400 mm (28 and 55 in) of rain.

The climate along the flat, coastal plain east of the range varies from oceanic in the south to humid subtropical in the northern half of the state, right above Wollongong. Rainfall is highest in this area; however, it still varies from around 800 millimetres (31 in) to as high as 3,000 millimetres (120 in) in the wettest areas, for example Dorrigo. In the state's south, on the westward side of the Great Dividing Range, rainfall is heaviest in winter due to cold fronts which move across southern Australia, while in the north, around Lismore, rain is heaviest in summer from tropical systems and occasionally even cyclones. During late winter, the coastal plain is relatively dry due to foehn winds that originate from the Great Dividing Range; the mountain range block the moist, westerly cold fronts that arrive from the Southern Ocean, whereby providing generally clear conditions on the leeward side.

The climate in the southern half of the state is generally warm to hot in summer and cool in the winter. The seasons are more defined in the southern half of the state, especially as one moves inland towards South West Slopes, Central West and the Riverina region. The climate in the northeast region of the state, or the North Coast, bordering Queensland, is hot and humid in the summer and mild in winter. The Northern Tablelands, which are also on the North coast, have relatively mild summers and cold winters, due to their high elevation on the Great Dividing Range.

Peaks along the Great Dividing Range vary from 500 metres (1,640 ft) to over 2,000 metres (6,562 ft) above sea level. Temperatures can be cool to cold in winter with frequent frosts and snowfall, and are rarely hot in summer due to the elevation. Lithgow has a climate typical of the range, as do the regional cities of Orange, Cooma, Oberon and Armidale. Such places fall within the subtropical highland (Cwb) variety. Rainfall is moderate in this area, ranging from 600 to 800 mm (24 to 31 in).

Snowfall is common in the higher parts of the range, sometimes occurring as far north as the Queensland border. On the highest peaks of the Snowy Mountains, the climate can be subpolar oceanic and even alpine on the higher peaks with very cold temperatures and heavy snow. The Blue Mountains, Southern Tablelands and Central Tablelands, which are situated on the Great Dividing Range, have mild to warm summers and cold winters, although not as severe as those in the Snowy Mountains.

The highest maximum temperature recorded was 49.7 °C (121 °F) at Menindee in the west of the state on 10 January 1939. The lowest minimum temperature was −23 °C (−9 °F) at Charlotte Pass in the Snowy Mountains on 29 June 1994. This is also the lowest temperature recorded in the whole of Australia excluding the Antarctic Territory.