precipitation, how much rainfalls or doesn t fall, a drought, perhaps. or soil moisture, as well. so the recipe for just vibrant, beautiful colors, no matter where you are watching us from, the green or white mountains or the achlations, what we need is a wet growing season so rain when we should have. it. but then a dry autumn, sunny days and cool, clear, frostless nights. so it s got to be cool, but not cold. we can t have it go below 32 degrees. so what happens, this is the sienls of it, how it changes. during the course of the warm growing season, the leaves produce chlorophyll to help plants create energy from light. now, that green pigment is dom nant. that s all you see. it hides the colors beneath it. what happens is we see that green chlorophyll stop being produce an the leave s green color fades. what happens is it fades and shows us the color underneath. chlorophyll, which is green,