The 10 days of cherry blossom time were fabulous, most of the time not even a little cloud on the sky.. But 2 days after cherry blossoms it started raining very hard, so I don't think so, that would destroy the vibes.
I don't think so, I pretty much played on all of the days of the cherry blossoms and it didn't rain once and the weather is consistent in ACNL no matter the year so I don't think it does, no.