WeatherSpark is a super-easy way to investigate the role weather plays in triggering your migraine episodes. Using current and historical data from a variety of national and international sources, WeatherSpark creates clear, detailed graphs based on the weather conditions you choose. Options include amount of sunshine, amount of cloud cover, precipitation type and amount, pressure, humidity, and more. For any of these factors, you can get data from specific days, months or years, or an average over multiple years. And, my favorite feature, three locations can be compared simultaneously.
Words are inadequate to describe the awesomeness of WeatherSpark. Get thee to the site and check out the beautiful graphs for yourself!