From experience I found that it helps if you place the compost pile in an
area where it doesn't get a lot of sun.

If there is too much sun, I found that the compost dries up fast, and if its
dry - it won't breakdown.

However, you could prevent that by placing a hessian sack or plastic sheet
over it- to prevent the water evaporation.

Also if you are using black compost bins in a very sunny spot, I found
that - too much sun- and the worms will die... horribly. In Summer, the
black bins overheat and the worms try and crawl out through the lid. Then
they get stuck there and perish- leaving a slimy mess when u open it.