At first I thought it had snowed . . .
A closer look told me it was rime ice -- frozen fog -- turning the world beyond the window into a fairyland . . .
Everything had been transformed and I dashed about in my nightshirt and bedroom slippers to get pictures before the sun broke through the clouds and undid the magic spell . . .
I was charmed by the tiny hairs that formed on the rose leaves in a sheltered corner . . .
Frosting on the evergreens . . .
And the crabapple . . .
The azalea leaves look furry . . .
As it turned out, I could have taken the time to dress and not run around bare-legged in the chilly morning air . . .
The fog hid the sun and the rime ice persisted till a little after noon.
Wikipedia has more than you might have imagined possible on the subject of rime ice HERE and hoar frost (a different thing altogether) THERE.