Rainbows appear when water droplets break sunlight into the seven colors of the light spectrum.
The sun is always behind you when you look at a rainbow, and the rain is always in front of you.
Most people believe that rainbows are only seven colors- red, orange, yellow, green, blue, indigo, and violet. Actually, this isn't true. There are continual colors of the rainbow, some of which even our eyes can't see.
What makes a double rainbow? Well, think about a normal rainbow. That's made by sunlight reflecting the colors of the light spectrum. Double rainbows are just like that, only the colors are reflected twice instead of once.
Rainbows occur more in summer than in winter (for most places) because in order to have a rainbow, there must be rain and sunshine, but in the winter, the water droplets are too cold and freeze, and the clouds usually block the sunshine.
Rainbows are so rarely seen at noon because rainbows are always opposite the sun, and so at noon, the rainbow would be below the viewer.
Did you know that, if the moon's light is bright enough, it can create a rainbow as well as the sun? Well, it can. This is called a lunar rainbow. It is made by the same process as a normal rainbow, only with the moon.
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