Midrasch zu Jechezkiel 34:26

Four quarters have been created in the world; the quarter facing the east, that facing the south, that facing the west and that facing the north. From the quarter facing the east the light goeth forth to the world. From the quarter facing south the dews of blessing and the rains of blessing go forth to the world. From the quarter facing west where are the treasuries of snow and the treasuries of hail, and thence come forth into the world cold and heat and rains. From the quarter facing north darkness goeth forth into the world. The quarter facing north He created, but He did not complete it, for He said, Anyone who says: I am a God, let him come and complete this quarter which I have left (incomplete) and all will know that he is a God.

The yoreh falls in Marcheshvan; the malkosh in Nissan. You say: The yoreh in Marcheshvan and the malkosh in Nissan. — But perhaps, the yoreh in Tishrei and the malkosh in Iyyar? It is, therefore, written "in its (proper) time" — the yoreh in Marcheshvan and the malkosh in Nissan. And thus is it written (Ezekiel) 34:26) "And I shall bring down the shower in its time; (showers of blessing shall they be.") But perhaps (it is called) "yoreh" (to shoot) in that it makes the fruits fall and floods the seeds and the silos! It is, therefore, written "and malkosh." Just as malkosh is for blessing, so, yoreh. — But perhaps, just as malkosh topples houses and uproots trees, and brings the cricket! It is, therefore, written "yoreh and malkosh." Just as yoreh is for blessing, so, malkosh, viz. (Yoel 2:23) "And, sons of Zion, be glad and rejoice in the L-rd your G-d. For He has given you the moreh in righteousness, and He has brought down for you rain — moreh and malkosh in the first (month)."