cold

How does hoar frost form?

Under clear, cold nights in winter, a hoar frost can form.

A hoar frost forms in a similar process to that of dew; the difference being that ice crystals are deposited, as opposed to water, because the temperature of the surface is below freezing.

Hoar frosts most commonly attach themselves to the branches of trees, leaves and grasses, but can also be seen on objects such as gates and flowerpots. Sometimes the deposits can be so thick that it may even look like a dusting of snow has fallen, creating a typical winter wonderland day.  

Cold snap wreaks havoc on African penguin population

The cold snap that hit South Africa in June, leading to incessant moaning from English football commentators who had failed to pack appropriately for the World Cup, had a far more malign impact on the nation's wildlife than it did on its showpiece sporting event. Around 600 African penguins, already an endangered species, were killed by the icy temperatures, heavy rain and significant wind chill over a two day period in mid-June on Bird Island, Algoa Bay in Eastern Cape province. The victims were mainly young chicks whose downy feathers provide scant protection against the elements.