Northern Thailand saw the mercury drop one to two degrees Celsius further yesterday, with frost a possibility on some mountain peaks.

Tourists are expected to be drawn by the cooler winter, with spending expected to top Bt1 billion in Thailand during the end-of-year high season.

Pensiri Trisat, a weather forecaster at the Northern Meteorological Centre, said that a high pressure system from China continued to move over Thailand and could bring down temperatures in the North by 1 or 2 degrees.

Read more: The Nation