Kyoto's mountain cherries reached full bloom on May 4, 1323 — day 124 of the year. Of the 838 years on record, the latest. From 812 to 1850 the average was April 15 (day 105.2). The 30 years to 1323 averaged day 103.8. Before modern weather records, the date comes from diaries and chronicles of flower-viewing parties at the imperial court, temples and shrines, gathered by Yasuyuki Aono. Data: Aono and Kazui (2008), Aono and Saito (2010), Katata (2026), via Our World in Data (CC BY 4.0). https://ourworldindata.org/grapher/date-of-the-peak-cherry-tree-blossom-in-kyoto