As fishing season starts on April 1st here, I can recall weather extremes on this very date in various years.
I recall it being 14 degrees one year and in the 70s another year on April 1st.
So whatever weather you are experiencing in early April .... it ain’t unusual.
Somehow you have the idea that unusual equals "never happened before in the history of the world".
It does not.
By now the threat of ice storms should have passed and it should not be snowing in my area. That would be common April weather.