Frost was reported at Phu Luang (4°C) and Doi Inthanon/Kew Mae Pan (0°C; grass -1.2°C) on Jan 9, drawing tourists to highland viewpoints

Tourists who flocked to Doi Inthanon early Monday morning were treated to a beautiful white frost that blanked the mountaintop, as a new high-pressure front from China caused the mercury to fall to zero degrees Celsius.