Kyoto's mountain cherries reached full bloom on April 1, 1413 — day 91 of the year. Of the 838 years on record, the 15th earliest. From 812 to 1850 the average was April 15 (day 105.2). The 30 years to 1413 averaged day 100.1. 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