Photo from http://www.freenaturepictures.com/

I love this article at wikipedia about rainbows it’s really informative and lovely photos. 

 WHEN IS THE BEST TIME TO SEE A RAINBOW?

The rainbow effect can be observed whenever there are water drops in the air and sunlight shining from behind the observer at a low altitude or angle. The most spectacular rainbow displays when half of the sky is still dark with draining clouds and the observer is at a spot with clear sky overhead. The rainbow effect is also commonly seen near waterfalls or fountains. Rainbow fringes can sometimes be seen at the edges of backlit clouds and as vertical bands in distant rain or virga. The effect can also be artificially created by dispersing water droplets into the air during a sunny day. I found this information on this site.

Read more about Rainbows and find answers to the questions below, Click Here for answers.

What is a Rainbow?

Where is the sun when you see a rainbow?

What make makes the bow? 

What makes the colors in the rainbow?

What makes a double rainbow?

What are supernumerary arcs?

What does a rainbow look like through dark glasses?

Other questions about rainbows?

What are reflection rainbows?

What is a lunar rainbow?

Rainbows and Proverbs

Experiments