Apolgies from a newbie if this turns out to be an old chestnut.
I have noticed this before in general - but in particular up here
(N.Yorks) in the last few days.I imagine there is a scientific name
for the phenomenon - which I hope someone will tell me.But more
generally I am hoping that someone will explain how/why it happens.
Layman's observations as follows.When I get up and take dogs out just
before dawn (c 7am now) I notice just traces of frost but nothing much
An hour later after it is light- I notice the frost is much more
intense - white over - and ice on the roads.
I would be most grateful for an explanation of why this happens and
what it is called.Many thanks.

Hawkeye