Please explain"with hey,ho, the wind and the rain" I assume it means the strength of natures forces?
Kind of. The clown is pointing out that in life there are unpleasent things that happen all the time. It may be out of one's control. For him it was the wind and the rain everyday, hence why it was repeated in every verse of his song. According to Feste, one has to let things be and they have a way of working itself out.