The easterly passage of anticyclones (high-pressure areas) and depressions is the main determinant of weather for most of Victoria. The track of the disturbances lies overland during the winter (generally the wettest season), while a more southerly oceanic course during the summer reduces the frequency of rain days. East Gippsland is an exception, since most of its rain results from intense depressions centred east of Bass Strait in the summer.

There is generally a close correlation between annual precipitation and elevation, and there is a clear decline in annual rainfall toward the northwest. The lowest-lying, driest parts of the Mallee usually receive less than 12 inches (300 mm) of precipitation per year, while in the Wimmera the annual amount ranges from about 12 inches in the far northern region to 22 inches (550 mm) in the higher elevations of the south. Some of the wettest areas in the mountains of the southeast may receive nearly 80 inches (2,000 mm) of precipitation in a single year, including heavy snowfall in winter.

The southern coast is generally cooler than the inland areas, except for the mountains, where in the highest elevations the average maximum temperature drops to less than 38 °F (3 °C) in winter. In Melbourne the maximum temperature in winter averages 55 °F (13 °C), while in summer the average is 80 °F (26 °C). In the warmest northwestern reaches of the Mallee, temperatures rise to a mean high of 90 °F (32 °C) in January and 59 °F (15 °C) in July.

Plant and animal life

Victoria has maintained a progressive conservation policy, the primary legislation of which was the Flora and Fauna Guarantee Act of 1988. Administered by the Department of Sustainability and Environment, this act aims to preserve biodiversity by guaranteeing an environment that will allow all species to survive and flourish. More than 300 plant and animal species have been declared endangered, and all native species are protected.

The flora and fauna of Victoria are as diverse as the state’s landforms. The slopes of the eastern segment of the primary upland region have the most extensive forest, the main species being snow gum, alpine ash, and mountain ash. Lower-growing vegetation is typical of the arid northwestern Mallee. The distinctive eucalypts of this region rarely exceed 30 feet (9 metres) in height and are surrounded by various grasses and shrubs. In the sparsely vegetated sands of the Big Desert, heath, scrub cypress pine, grass tree, and other low shrubs predominate.

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Victoria is home to a broad spectrum of animal species. Common marsupials include various kangaroos, wallabies, bandicoots, and wombats. Koalas usually inhabit wooded regions, but they have become a problem in some urban and residential areas, where they defoliate trees because of insufficient food supplies in their (shrinking) forest habitat. Other native mammals include the Australian fur seal on the coast, swamp rats, and flying foxes. Red deer are common in the Grampians and the Otway Ranges. Although not native to Victoria, deer are nevertheless protected. Rabbits, on the contrary, are ubiquitous and have become a serious menace to farming communities. Their eradication is an ongoing project. An assortment of native ducks and other waterbirds populate the wetlands, and cormorants are common on the coast. There are several types of cockatoos in Victoria, and although native to the region, some species are unprotected in certain circumstances. Victoria is also host to a wide range of passeriform birds, including various fairy wrens and honeyeaters. More than 50 species of lizards and snakes have been recorded in the Big Desert.