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Cold, unstable winds and showers to Tas, SA, and Vic. Showers are falling as snow in the Alps & highland Tas. Storms are impacting eastern Qld, northwest WA & the tropics in unstable air. Hot, dry winds are blowing across WA's south and inland regions.
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01 Dec 2025, 11:55PM UTC
Canberra plummets to -0.3°C, its first sub-zero summer temperature on record
We all know Canberra is cold and frosty at night during late autumn, winter and early spring, but in over 100 years of records, the national capital had never recorded a night below zero in the summer months. Until now. On Tuesday, December 2, 2025, at 5:50 am, the mercury at the current official city weather station at Canberra Airport fell to -0.3°C. The previous coldest summer temperature recorded at Canberra Airport was +0.3°C, on December 6, 2012. The previous coldest summer temperature recorded at any of the old official Canberra weather stations was 0°C at Acton on December 3, 1924, when Canberra’s population was barely 2000 (it was just over 450,000 at the 2021 census). What caused the record summer chill? An outbreak of bitterly cold polar air pushed across southeastern Australia on Monday, bringing snow to elevated parts of Tasmania and the mainland high country. While snow was relatively heavy in the mountains, it was one of the classic systems where the airmass dried rapidly in the lee of the ranges, which meant Canberra saw just 0.4mm of rainfall. The airmass east of the mountains continued to dry out under gusty west to northwesterly winds, and when those winds dropped to a zephyr for a brief period early on Tuesday morning, the ingredients were in place for rapid cooling. Image: Mean sea level pressure anomalies for Tuesday, December 2, 2025, showing a strong high pressure system centred over southeastern Australia, in a position more typical of winter. This contributed to the cold, still air over the ACT overnight. Elsewhere, Thredbo Top Station recorded -4.0°C and Mt Hotham cooled to -2.8°C (Tuesday’s lowest temperatures in NSW and Vic respectively), however these were not summer records as it remained relatively windy overnight up high. Meanwhile Canberra can expect dry weather this Tuesday with a mild maximum of 22°C. Predominantly dry conditions should last for at least the next week, with maximum temperatures rapidly rising into the low 30s from Thursday through to Saturday. This is not ideal for the parched parks and gardens of the capital. Canberra was roughly on par with its running average annual rainfall tally by the end of September 2025. But after only about half the monthly average rainfall in both October and November, the capital now needs an exceptionally wet December to reach its annual average of 643.1mm. So far this year it has received 497.4mm.
01 Dec 2025, 10:43PM UTC
Three tropical cyclones cause widespread flooding in southeast Asia
Tropical cyclones Senyar, Koto and Ditwah have brought widespread deadly flooding to parts of southeast Asia over the past week, including Indonesia, Malaysia, Thailand, the Philippines and Sri Lanka. Senyar brings devastation to Indonesia and the Malaysian Peninsula Early last week, the Indian Meteorological Department (IMD) issued warnings for a rare tropical cyclone in the Malacca Strait named Senyar. According to MetMalaysia, this is the first tropical storm to intensify in the strait that separates Indonesia's Sumatran Island, and the Malay Peninsula. The region rarely experiences tropical storm strength systems due to the proximity to the equator, which limits the coriolis force required for tropical cyclones to form. Devastation across the region came with the torrential rainfall as monsoonal winds wrapped around Senyar, delivering hundreds of millimetres of rain within short periods of time. The map below shows rainfall estimates over the past week and Senyar’s track. However, the worst affected areas of North Sumatra, Aceh, northeast Malaysia and southern Thailand have received rainfall accumulations exceeding the maximum denomination of the scale (300mm). Image: Quantitative Precipitation Estimates (QPE) across Sumatra and the Malay Peninsula in the week to 5am local time on Monday, December 1, 2025, along with Tropical Cyclone Senyar’s past and future track. Source: Weatherzone. Along with the torrential deluge, flooding over the region was also enhanced by the Barisan and Titiwangsa mountain ranges in Indonesia and the Malay Peninsula, respectively. The deep flow of moist monsoonal winds moving over the mountains resulted in heavy precipitation which flowed into the already flood-affected areas. Flooding and landslides have caused at least 600 deaths across Indonesia, Thailand and Malaysia, with rescue and relief efforts disrupted by destruction and closures of roads, airports and other transport infrastructure. The remnants of Senyar moved off the east coast of Malaysia late last week. Daily showers will continue to affect the region over the coming week, bringing rainfall accumulations of 60-100mm. While further flooding is not expected, persistent showers could delay the floodwater withdrawal. Sri Lanka hit by deadly flooding with Tropical Cyclone Ditwah In the north Indian Ocean, Tropical Cyclone Ditwah tracked roughly parallel to Sri Lanka’s south and east coastlines late last week. Much of the country received rainfall in excess of 300mm over less than three days, leading to widespread and devastating flooding. Image: Quantitative Precipitation Estimates (QPE) across Sri Lanka and southern India in the week to 2:30am local time on Monday, December 1, 2025, along with Tropical Cyclone Ditwah's past and future track. Sri Lanka's death toll is approaching 200 lives lost, with rescue and relief efforts also encountering severe difficulties with the destruction to essential transport and utility infrastructures. Ditwah has since weakened after moving north of Sri Lanka, but heavy rainfall should continue to impact southern and eastern Tamil Nadu and coastal Andhra Pradesh over the next 3-4 days. Image: Forecast rainfall accumulations in the three-day period to Thursday morning, December 4, 2025, showing heavy rainfall from the remnants of Ditwah impacting southern India. Source: Weatherzone. Tropical storms lining up into the South China Sea The satellite loop below shows two areas of convection to the west and east of the Philippines. Video: Infrared satellite imagery showing Tropical Storm Koto approaching Vietnam, and another area of convection well east of the Philippines which could intensify over the coming week. Source: Weatherzone. Tropical Storm Koto was briefly a typhoon over the South China Sea late last week, marking the 14th typhoon of the Western Pacific Typhoon season, and 27th named system. It has since weakened, but impacts are being felt as it approaches Vietnam, with heavy falls expected over coastal and central Vietnam this week. Image: Forecast rainfall accumulations in the three-day period to Thursday, December 4, 2025, across Vietnam. Source: Weatherzone. Further east in the Pacific is an area of convection that could become more organised as the week goes on. Parts of the Philippines could become impacted late this week and into early next week if the system develops, with Vietnam potentially receiving another round of heavy rainfall next week if the system continues to track westwards.
01 Dec 2025, 7:22AM UTC
Perth sizzles with 39°C, Melbourne shivers with 16°C
West Coast 39°C, Melbourne 16°C. It sounds like a progress score in an AFL or basketball match, but those were the maximum temperatures experienced on a day of huge weather contrasts between the southern tip of Australia's east and west coasts on the first day of summer. Melbourne’s maximum to 3pm Monday was actually 16.1°C, which made it the coldest summer day in four years. The chill in Australia’s southeast was caused by a cold front which injected polar air across much of Victoria and southern NSW. Snow fell heavily at times in the high country with the mercury remaining below zero through daylight hours at Mt Hotham (Vic) and Thredbo (NSW). On the opposite side of the country, air circulating anti-clockwise around a high pressure system caused a large pool of hot air to be pushed towards western and northwestern Australia. The heat across the country’s SW corner was widespread on Monday. Albany Airport – just over 400km SE of Perth in the relatively cool South Coastal forecast district – reached 36.1°C. Geraldton – just over 400km NW of Perth, endured a sizzling 42.2°C start to the 2025/26 summer. Perth itself had a maximum of exactly 39°C to 3pm Monday, while some suburbs topped 40°C. Image: Synoptic chart for Monday, December 1, 2025 showing air circulating anti-clockwise around the high, bringing very cool air to the southeast and hot air to the southwest. As Weatherzone meteorologist Ben Domensino wrote on Monday afternoon, the hot air that is baking WA on Monday will spread east during the week as the high pressure system drifts over southeastern Australia and eventually off the country’s east coast. Melbourne should warm up to as much as 33°C on Thursday, while Perth’s maximums will drop into the 20s for the rest of the week as winds shift to a southwesterly direction.