why does my hair change to a lighter color in the summer?

Question: why does my hair change to a lighter color in the summer?
- Keywords:
  colour,
  hair,
  summer
Asked by Panic! at the disco to Deborah on 14 Jun 2016.
- Deborah Prunty answered on 14 Jun 2016:
  
  Sun light causes the colour in our hair to fade a little. As there is more sunshine in the summer it happens more, making it more noticeable.

Question: why does my hair change to a lighter color in the summer?