This is miyazaki rain, which means that every frame was hand-drawn
This gif is from the upcoming Shinkai Makoto film Kotonoha no Niwa. It is a slightly slowed down version of the 2-second clip you can see around 0:49 of the official trailer. Shinkai Makoto is not, and has never been, affiliated with Miyazaki Hayao.
Can people on tumblr fucking learn to source their claims? Or at least start getting it into your heads that nothing should be believed unless it has a credible source of scholarly or reliable origins.