White camelia - browning flowers?

They go brown when they get frosted 

Browning is normally caused by morning sun shining on frost covered plants. If they are in pot's move them to where thay can thaw before the sun shines on them.

I grow camelia's and like everyone has said before it's more likely to be frost.

I'm not going to help much here but, we also have a white camelia with the same affliction.

It has always suffered in this way.
It is in an area shaded by pine & birch trees.
It is up against a fence.
It faces West.
It never has any direct sun (except in high summer, & then only late evening)
The only sun it does get is past midday ( I know frosts last all day sometimes)

I might post a pic tomorrow....if I can work out how