Frosty fence with robin
Spiky hoarfrost, or air hoar, has made this wire fence look much more beautiful than usual on this freezing morning. Hoarfrost forms in a similar way to dew, but when the temperature of the surface is below freezing. Additional water can condense on to the hoarfrost to lengthen the spikes.
Michelle Cain (distributed via imaggeo.egu.eu)