Just as heads up for travellers: This weekend shows that winter conditions can also happen suddenly at mid / end of April in mid and southern Germany. The famous rule "winter tyres from O(ctober) to O(stern) [easter]" is again disproved this year by weeks.
Sources: map and picture of DWD (public German weather service) on X and article by second public German TV news.
Therefore please plan spring travels in Germany with caution and order winter tyres for rental cars.