Mau Son and Yen Tu mountains in the northern provinces of Lang Son and Quang Ninh have been covered in layers of ice and frost as temperatures dropped below 0.
Most places of northern Vietnam saw temperatures below 10 degrees Tuesday morning. Other places with low temperatures include Vinh Phuc's Tam Dao at 1 degree, Ha Giang's Dong Van at 2 degrees, and Lao Cai's Sa Pa at 3 degrees.
Ice and frost have appeared on the peak of Phia Oac in Cao Bang since Monday afternoon.
The ongoing cold wave, where average daytime temperatures stay below 15 degrees in the plains, would last until Jan. 25 for northern and north-central Vietnam, according to the National Center for Hydro-Meteorological Forecasting.