"Ask the Lord for rain in the springtime; it is the Lord who makes the storm clouds. He gives showers of rain to men and plants of the field to everyone." -Zechariah 10:1
I really like this verse and the perspective it gives on who is in control of nature. In Biblical times, rain was a hugely important part of their agrarian society. When it didn't rain, that meant the crops weren't going to grow and with no crops you were in a tight spot.
The rain is something that isn't within our ability to control but definitely within God's. It doesn't do to worry about that which we can't control. By remembering that He is in control of the rain, we keep in mind the One who provides for us in all things whether physically, financially, emotionally, or in some other area. The peace that comes from this trust goes a far piece down the road.