Idaho tops the Perfect Weather Index for the first time this year on Tuesday. As we move toward summer, the best weather is shifting north as heat and humidity lowers the PWI across the southern tier states. Even in Idaho tomorrow, much of the perfect weather will be at higher elevations in places like Stanley, ID. Also 10s across parts of Montana including Billings and Bozeman. Worst weather tomorrow in Minnesota, unless you count Alaska which looks unusually poor.