Gangneung recorded its first tropical night of the season on May 31, marking the third-earliest occurrence in historical records [1, 2].
This early spike in nighttime temperatures signals an accelerated shift toward summer heat patterns in South Korea. The event highlights a volatile weather trend where seasonal benchmarks are being met weeks ahead of typical schedules.
A tropical night is defined as a period where the minimum temperature does not drop below 25 °C [1]. According to the Korea Meteorological Administration (KMA), Gangneung hit this threshold on the night of May 30 to 31, 2026 [1]. This arrival is 19 days earlier than the previous year [2].
Forecaster Seo Eun-jin of the KMA said the phenomenon was caused by warm, dry winds crossing the Taebaek Mountains [1, 2]. She said that this event ranks as the third-earliest on record, following only the occurrences in 2014 and 2019 [1].
The heat continued into the following day, with Gangneung recording a daytime high of 33.6 °C [1]. The rapid transition to high temperatures has caught the region by surprise, as the city experiences intense heat before the official start of the summer season.
YTN reporter Jung Hye-yoon said the clock of the seasons is moving forward by more than a month [1]. The sudden warmth is attributed to the specific topography of the region, which allowed high-temperature air to descend and settle over the city.
“The clock of the seasons is moving forward by more than a month.”
The recording of a tropical night in late May suggests a significant deviation from historical climate norms in the Gangwon region. By ranking as the third-earliest event on record, this heat pattern indicates that the geographical influence of the Taebaek Mountains is interacting with broader warming trends to trigger premature summer conditions. This may lead to increased energy demands for cooling and potential agricultural disruptions earlier in the year than previously anticipated.
