You may find several resoureces on the web where people tried to decode Bresser Weather station data with an RTL SDR Stick.

In my opinion running a Rasp Pi just for decoding some RF Weather data is a overkill of resources.

There ought to be a smarter solution!!!

The Bresser Weather Stations transmits trhe data in an FSK Modulation:

You may find detailed information about the proticol here: or here. I cant explain it better than they did.

Based on this idea I started to search for a decoder and foudn a CC1101 Chip. I call it the swiss army knife of RF Recivers.

With this Receiver and the Lib Radiolib you may decode a lot of stuff easily.

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This is how the game begun:

With some help of the Twitter community I finally got it to work: