This is the time of year to watch for patterns in frost. Viewing is best around sunrise following a clear night.
The patterns of frost, dew, and snow melt have been discussed other years (e.g., IR snow melt) and so explanations will not be repeated.
These are footprints on a sandy beach. The frost-covered ridges are colder than the valley floors.
The frost-covered lawn surrounding a small tree is colder than that under the tree.
