S. Korea records highest number of July tropical nights

South Korea saw yet another hot summer night on Wednesday into Thursday, marking a record-breaking number of tropical nights in July, as a prolonged heat wave continues to grip the country.

The number of tropical nights this month reached 22, surpassing the 21 recorded in 1994.

It's also the longest streak in 117 years, since data was first compiled in 1907.

A tropical night occurs when nighttime temperatures remain above 25 degrees Celsius between 6 PM and 9 AM the following day.

With heatwave warnings in place in most parts of the country, the daytime temperature in Seoul is expected to reach 36 degrees today.