Kyoto's mountain cherries reached full bloom on April 13, 1099 — day 103 of the year. Of the 838 years on record, the 324th earliest. From 812 to 1850 the average was April 15 (day 105.2). The 30 years to 1099 averaged day 103.9. 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