I believe that the Sun is the major contributor to weather on this planet simply because the sun, as a star, generates the most energy in our solar system. This isn't an astonishing revelation but we really don't know enough about the sun.
The real reason I am posting this is because of the following graphic; this is just way too cool.
From the UK Daily Mail- The Sun - as you've never seen it before. And it's an interesting read also.