I have the same issue hereā¦
Ive done that multiple times.
From what I understand there something wrong with the config and resources, no icon at all is shown in the dashboard even though managed to get the weather working.
I really followed the guide step by step, there sure is something very basic, that the guide does not mention that I am missing.
in case it got overlooked 
I did manage to get it work, but do to its re configured dashboard I get a lot of errors. I canāt get the weather icons appear at all, even when I start with blank dashboard. I did made the configuration references, but my knowledge is kind of limited, ill spend some time to read and start trial and error.