What does “and it’s hard, it’s a hard, it’s a hard, it’s a hard, it’s a hard rain’s a-gonna fall” by bob dylan mean or represent?

I think it means that its about to pour down raining

This song could well be a conversation between God and Jesus, the 'blue-eyed son'. He is reporting on what mankind has proven himself to be all about. God has given mankind the intelligence, the hands and the free choice to live in paradise, and this is what he has done with it. In the process, God has also given mankind enough rope to hang himself good and proper, for all time. The last stanza is not meant as 'Jesus' going back to tell mankind about the error of its ways and try for better things: It is long, long past too late for that, and nothing can be done to forestall the inevitable anyway. No, the last stanza is about sending the Prophet of God down to tell mankind to prepare for the Holocaust; it is coming. It is here. This song is about the coming Apocalypse, and the hard rain is the terrible storm man has brought down upon himself with his wars, his inhumanity to all life, his pollution, his wasteful and profligate ways with fossil fuels and nuclear energy.

Hope this helped a bit! ;-)

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the dog listens to mr miller