I had noticed reading through some forums that some people were using polarized filters with their weather camera.  I noticed right away on my weather camera that the image seemed washed out.  So, I decided to research a polarized filter.

The first option I found was a sheet of polarized film.  This seemed like a good solution except for the price.

I settled on a standard 35mm filter.  I was able to position it right in front of the web camera and the window glass.

The pictures did start to show more contrast which was nice.