This
data comes from a La
Crosse Technology WS2300 weather station which is outside about
10meters from the house. It sends data to a base station in my bedroom
every 8 seconds.
This is then sent to the TheGeekBox
server where Weather
Display records the data and outputs it as images which can
be seen here. Solar data is recorded by a different sensor from HobbyBoards
however where it placed at the moment (see the picture below) the
results are abit hit and miss. Any more questions? Then feel free to email me: 
Station:

Solar (the windows look rather out of shape that's down to
these
photos being taken with the camera on my phone rather than a failing in
the window frames :):
The base station (another phone photo):