We had 0 degree night and I have what Wayne described in orchid book frost blotches on mostly new leafs.
I'm sure there would be no visual damage as per Waynes experience in that book. Interesting is that I have water my orchids yesterday midday. So I have frost on and under Speciosum leafs but no damage. Only few blotches as seen on photo.
I hope attached photos will go through as I send with mobile phone.