Given its size, New South Wales experiences a wide range of climates. The coastal region, including Sydney, enjoys a temperate, oceanic to humid subtropical climate with warm to hot summers (average 26°C/79°F) and mild winters (average 16°C/61°F). Rainfall is generally distributed throughout the year, though the northern coast sees heavier summer rains.
The Great Dividing Range features cooler temperatures, transitioning into a true alpine climate in the Snowy Mountains, where winter temperatures routinely drop below freezing, bringing substantial snowfall.
West of the ranges, the climate becomes increasingly semi-arid to desert (Köppen classifications BSk and BWh). Summers here can be blistering, often exceeding 40°C (104°F), while winters are cool with cold nights.
NSW is prone to severe natural disasters, most notably extreme bushfires during the hot, dry summer months, and cyclical flooding in coastal and riverine areas. The best time to visit the coastal and central regions is during the shoulder seasons of spring (September–November) and autumn (March–May), when the weather is mild and clear.