I found this link to this clever and easy to use map routing website:
http://get-there-dry.com/
You just type in a start and finish destination (coordinates or type a place name), hit GO and it will tell you what the weather will be like during your jouney and more importantly where and when you'll encounter any. At the bottom of the route map you can adjust when you want to start your journey.
Nothing fancy but might be useful for our sort of thing, including rallies
http://get-there-dry.com/
You just type in a start and finish destination (coordinates or type a place name), hit GO and it will tell you what the weather will be like during your jouney and more importantly where and when you'll encounter any. At the bottom of the route map you can adjust when you want to start your journey.
Nothing fancy but might be useful for our sort of thing, including rallies