An empty road is seen in snowy weather at Blue Mountain to the west of Sydney, Australia, on June 10, 2021. Sydney on Thursday recorded its coldest day in 37 years, as an Antarctic chill lingered over the Australian state of New South Wales (NSW). (Photo by Hu Jingchen/Xinhua)

People walk in snowy weather at Blue Mountain to the west of Sydney, Australia, on June 10, 2021. Sydney on Thursday recorded its coldest day in 37 years, as an Antarctic chill lingered over the Australian state of New South Wales (NSW). (Xinhua/Bai Xuefei)

People walk in snowy weather at Blue Mountain to the west of Sydney, Australia, on June 10, 2021. Sydney on Thursday recorded its coldest day in 37 years, as an Antarctic chill lingered over the Australian state of New South Wales (NSW). (Xinhua/Bai Xuefei)

An empty road is seen in snowy weather at Blue Mountain to the west of Sydney, Australia, on June 10, 2021. Sydney on Thursday recorded its coldest day in 37 years, as an Antarctic chill lingered over the Australian state of New South Wales (NSW). (Photo by Hu Jingchen/Xinhua)