This is one weird year.
The weather pattern so far where I live.
Winter-like Day (No snow) - Winter-like Day (No snow) - Spring-like Day - Summer-like day - Summer-like day - Summer-like day - Summer-like day - Summer-like day - Summer-like day - Winter-like Day (snow)
My guess on what's happening in the Touhouverse:
Letty calmly let Lily announce the coming of Spring, Lily got too excited, and then Letty came back to pwn the fairy.