I just realized, that
pd.merge(df1, df2, how='outer', left_index=True, right_index=True)
does not seem to work for multiple, i.e. 5 DataFrames?
All the 5 data frames have the same index called "time". Also, all have the same column named "temperature".
Can this be done?
Hint: I experimented with join. but wasn't happy with the result.