This day is an important day in the Farmers Almanac. It is called a Lostag in German. (I couldn't find a direct translations of this word). It is a specific Calendar day, in this case 27th of June, that farmers have used to predict the coming weather. Kind of like Groundhogs Day. It is said that what ever the weather is on Siebenschläfertag, it will stay for the next seven weeks!!
NO!!! It was pouring down rain yesterday!! SO seven more weeks of rain!!! I really hope this isn't true.
In researching this day I found this cute guy.
der Siebenschläfer - the edible dormouse, Glis glis