Tierr@_de_N@die: Never, since the people of Kyoto have started to record the day in the year the cherry blossom was in full bloom, it has occurred so early. And as the chart shows the dates record started in the year 812.
Since the year 812 people in Japan have recorded the first day in the year the Cherry Blossom was in full bloom in Kyoto. Based on this record you can see some of the local climate effects.
Source (datgraver.com): Kyoto Cherry Blossom Full Flower dates