Some times in winter we get hoar frost. I was not sure why more so on some days and not on others so I looked it up. Courtesy of Weather Online an explanation was given.
Under clear frosty nights in winter soft ice crystals might form on vegetation or any object that has been chilled below freezing point by radiation cooling. This deposit of ice crystals is known as hoar frost and may sometimes be so thick that it might look like snow. The interlocking ice crystals become attached to branches of trees, leafs, hedgerows and grass blades and are one of the most prominent features of a typical 'winter wonderland' day. However, the fine 'feathers', 'needles' and 'spines' might also be found on any other object that is exposed to supersaturated air below freezing temperature.
Hoar frost must not be confused with rime, which derives from freezing fog or glaze which forms as a continuos thick layer of ice, rather than individual frozen droplets.
So I took some photos to show you the Hoar Frost and thought to day was a good to day show them!