How Does Frost Form ?

This explains the different types quite well
http://www.bbc.co.uk/weather/features/37852657

 

Oh it's a video @HarryS ! I was all set to read your post. I'm currently Mutt and Jeff as my ears are plugged due to drops, so I'll have to come back to this.

 

All that so they can beg for free photos to keep their costs down

Very interesting, so, thank you for the link @HarryS

 

It's interesting to show how ground frost can form , when the air temperature is +2 +3 °c . So although a bit above freezing it can catch your bedding plants out if you are two early . Also if you are storing plants outside it's best to raise them up from ground level as a safeguard against frost - this wont help if temp plummets to -6°c !

 

Video watched and box ticked. I saw air frost on the way home yesterday hanging over fields, even though I had my camera with me I couldn't stop for a photo as the road was to busy.