Ok Just for you I will give you the truth.
Yes there was rain before the flood of Noah.
Gen 2:5 And every plant of the field before it was in the earth, and every herb of the field before it grew: for the LORD God had not caused it to rain upon the earth, and there was not a man to till the ground.
The only time there was no man to till the ground was before day six through day seven. Once Adam was placed in the garden part of his job was to tend it and keep it. that would include tilling. but they sinned on the eighth day (me personal belief) and they were expelled and from that point on God says, Gen 3:17-19 ¶ And unto Adam he said, Because thou hast hearkened unto the voice of thy wife, and hast eaten of the tree, of which I commanded thee, saying, Thou shalt not eat of it: cursed is the ground for thy sake; in sorrow shalt thou eat of it all the days of thy life; Thorns also and thistles shall it bring forth to thee; and thou shalt eat the herb of the field; In the sweat of thy face shalt thou eat bread, till thou return unto the ground; for out of it wast thou taken: for dust thou art, and unto dust shalt thou return. the whole gist here is that as he sowed the ground it would bring forth thorns and thistles and that he would have to eat the herbs of the fields (not those in the garden).
And Cain was a farmer, Gen 4:2 And she again bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground. there it is a divine cross reference of the word till/tiller of the ground.
So in conclusion Adam and Cain were tillers of the ground and so it rained after the eighth day and had rained until the day of the great flood. because not caused it to rain upon the earth, and there was not a man to till the ground. it would seem that as long as there was not a man to till the ground God did not let it rain only a mist went up to water the ground.