Nature is catching up on the weeks it lost in march, and it is catching up very quickly. Everything happens at once, even chestnut trees already have begun to flower. And pear trees finally have joined in, again they're late but not by much, the first pear flowers I saw last year in the first days of april while it took them till mid-april this year.
Oh, and a PS: while prunus species are almost done with flowering, apple trees haven't yet begun.