The National Center for Hydro-Meteorological Forecasting said June cold fronts, once a near-annual feature of northern Vietnam, have grown steadily rarer over the past four decades. The agency logged 25 of them between 1979 and 2025, about 0.53 a year.
Since 1991 that count fell to just seven across 35 years. From 2014 through 2025, not a single one was recorded.
Nguyen Van Huong, who heads the center's weather forecasting division, attributed the disappearance to climate change and global warming.
The returning front will reach the northern mountains on the afternoon and evening of June 8 before spreading across the northeast, parts of the northwest and north-central Vietnam.
Combined with a high-level wind convergence zone, the system will dump widespread moderate to very heavy rain from the evening of June 8 through June 9.
