Here is a graphic showing a breakdown of the plots.

Surface Data Plot

The surface data plot gives the following information:

Data Description
temperature (F) plotted upper left
present weather symbol plotted center left (see below)
dewpoint (F) plotted lower left
pressure (.1 mb-coded) plotted upper right as last 3 digits (987=998.7mb, 024=1002.4mb)
cloud cover center circle. white fill indicates % cloud coverage (see below)
winds wind barb (see below)

Weather Symbols