If I may add to Varsha's excellent answer -
I would say that 'il fait beau' is how the weather looks to you, sunny, blue skies etc..
'Il fait bon' is how it feels to you, temperature etc ...
Hope this helps!
If you look at the end of the lesson , the difference between the two is quite imminent.
1.Il fait beau- used when one has to describe how the weather looks (nice)
2.Il fait bon - used when one has to say how the weather is/feels (according to your opinion) as neither too hot nor too cold.
The latter is used in the sense "It is warm"
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