The Definition of Insanity

 It's often said that the definition of insanity is doing the same thing over and over and expecting a different result.  I keep going to the weather web site and clicking on the forecast for Saturday expecting that miraculously it will change and the temperature will drop.  I do this over and over and over and it doesn't change.  It will be hot and humid.  Does this mean I'm insane?  Is there a difference between insanity and crazy?