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If you want it and we don't have it, please Tell Us About It! We'd be happy to add a link to your favorite weather source.
The National Ocianic Atmospheric Administration or NOAA has an Aviation Weather Center where you can find just about any piece of aviation weather information you could want including:
A great source for hour by hour data is US Air Net. On this site you can find sky condition, wind velocity and direction, ceiling, temperature, dew point, and precipitation on an hour by hour basis. Great for preliminary flight planning.