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March Rainfall was 74% above average for NSW, and 35% above average for Victoria however overall rain was 27% below average for Australia. A large number of sites in NSW recorded their wettest March on record, in Greater Sydney, Illawarra, Northern Rivers and the Mid North Coast saw numerous daily records and monthly records broken.
Recent climate events such as extremely high temperatures and widespread drought have focused government and public attention on the effects of climate change in Australia. [153] Rainfall in southwestern Australia has decreased by 10–20% since the 1970s, while southeastern Australia has also experienced a moderate decline since the 1990s. [150]
According to the website, each monthly issue "contains monthly mean temperature, pressure, precipitation, vapor pressure, and sunshine for approximately 2,000 surface data collection stations worldwide and monthly mean upper air temperatures, dew point depressions, and wind velocities for approximately 500 observing sites.
Rainfall rates downwind of cities are increased between 48% and 116%. Partly as a result of this warming, monthly rainfall is about 28% greater between 20 miles (32 km) to 40 miles (64 km) downwind of cities, compared with upwind. [66] Some cities show a total precipitation increase of 51%. [67]
In 2018, rainfall for the year was very low over the southeastern quarter of the Australian mainland. [62] Exacerbating the effects of diminished rainfall during the 2018 El Niño year were a record-breaking run of above-average monthly temperatures, with the first half of 2019 being on an El Niño alert. [63]
The Australian monsoon (AUM), also known as the Australian summer monsoon (ASM), [2] and the Australian-Indonesian monsoon (AIM), [3] is a monsoon system that increases thunderstorms and rainfall over many areas of Indonesia and northern Australia, from the far northern tropics of the region to the semi-arid zone of Australia, typically between ...
A thunderstorm in Sydney. The climate of Sydney, Australia is humid subtropical (Köppen: Cfa), [1] shifting from mild [2] [3] [4] and cool [5] in winter to warm and occasionally hot [5] in the summer, with no extreme seasonal differences since the weather has some maritime influence (as it is moderated by proximity to the Pacific Ocean). [3]
Summer rain over Melbourne, taken from Brighton Winter fog over the Melbourne city centre. Melbourne, the state capital of Victoria and the second most populous city in Australia (most populous in urban area), has a temperate oceanic climate (Köppen climate classification Cfb), with warm summers and cool winters.