I have to agree with Coral. Weather is too finicky. Plus, its hard to tell if perceived weather data is already factored into the price or not. In fact, that goes for ALL fundamental information. I can't tell you how many times I have seen the market move opposite of the fundamental news, because it was expected, and already over factored in. The charts however, show all the data just by where the price is alone.
Coral and I may have differing methodologies (He likes to predict, I prefer to wait untill the wave forms and ride it as it happens), but we both agree technical analysis beats the fundamentals.