I combined both of them and finally the E Paper is working. Well, it is not the best resolution, but its fine.
Can I add a white space or (small tab) in case of a temperature with only one digit before the comma?
The picture shows exact 10,0 Degrees, I know that.
I do not want to have a leading zero, so this layout should only be applied for temperatures between 0.0-9.9 °C (negative temperature have two digits before the decimal point)
Furthermore temperatures below - 9,9°C are not existant (at the moment) 