Kyoto's mountain cherries reached full bloom on March 27, 1409 — day 86 of the year. The earliest on record at the time — before it, 961's March 28. Of the 838 years on record, the 3rd earliest. From 812 to 1850 the average was April 15 (day 105.2). The 30 years to 1409 averaged day 101.9. 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