Last year the cherry blossoms festivals were moved up due to warmer winter weather and various cities kept them scheduled for the same time this year. However, this year the weather was colder this spring and thus the trees are blossoming at its normal time:
Local governments, renowned for hosting iconic flower festivals every spring, find themselves grappling with flowerless venues this year.
The delayed blooming of seasonal flowers, primarily attributed to climate change, has resulted in a significant setback, leaving these venues bereft of their usual vibrant displays.
The Jinhae Gunhangje Festival, Korea’s largest cherry blossom festival that is held in the southern port city of Changwon, South Gyeongsang Province, kicked off on Saturday. However, as of Sunday, the city’s flowering rate stood at only 15 percent, with the full bloom phase anticipated to occur later next week, according to the city government. (…….)
Even a month ago, many anticipated the flowers to bloom earlier than usual, again, as abnormally high temperatures were recorded last winter. The country’s average temperature last month was 4.1 degrees Celsius, registered as the highest in February since 1973.
But the weather changed suddenly in March, with abnormal subzero temperatures and lower precipitation levels, failing to offer the necessary and sufficient conditions for the spring flowers to bloom.
Korea Times
You can read more at the link, but this sounds less like climate change and more like the weather.