Can't find guide
I'm new to Windy (mainly Meteoblue user beforehand) and still discovering new functions. I haven't found a guidebook or 'key' (stuck on 's' sign, guessed others were rain and snow. Don't know how to make best use of bottom and sidebar either. My first impressions are very favourable, great work.
There is no real guide to explain how to use this App.
You can get information via this link
A member created a user guide some time ago
But it has not been updated since that time.
If you have special questions, you can ask them here.