Thursday, 13 December 2012

Hoar Frost - 5 things

-5 and we have a winter wonderland of hoar frost. Yesterday was the first day this winter I was actually cold whilst mucking out the horses. It's going to be a long hard winter. Anyway facts about hoar frost:

Hoar frost is also called radiation frost or hoarfrost or pruina.
Hoar frost  forms on cold clear nights when heat losses into the open skies cause objects to become colder than the surrounding air.
Hoar frost is white ice crystals deposited on the ground or on objects such as the plum trees pictured above.
The word hoar  comes from the old english adjective for showing signs of old age.
 Hoar frost also occurs in man made environments eg. freezers and cold stores.

Update: Mrs Fox has published some glorious hoar frost photographs on her blog Mrs Fox's do go and take a look.


  1. We haven't had hoar frost in Worcester -just ordinary frost but two years ago when we had that very cold and snowy December I managed to get some photos of the most beautiful hoar frost. I saw a speeded up film of it forming the other day on a David Attenborough programme and it was just spectacular -wonder if I can find it on youtube?

  2. It really was cold wasn't it?

    While walking the dogs I took pictures, they're here;

    And then had to go home and do the washing up in really hot water to get my fingers working again.