How often are you supposed to change windshield wiper blades?

My step-dad just changed mine and I'm amazed at how much nicer they are. Just curious how often you're really supposed to change them.How often are you supposed to change windshield wiper blades?
Dear Wipers-



Just change them annually. I normally do it at the first of September in my area, that is about when out rain season starts.



If you are living in a place like the PNW, (Pacific North West), Portland, Oregon or Seattle, Washington; I would say change those wiper blades out as soon as they start streaking the window.



As for the person who told you to use Rain-X, I agree with her. That is an excellent product. I have been using it for years. I have yet to find a better product of its type. With new wiper blades and the Rain-X, you will be good to go!How often are you supposed to change windshield wiper blades?
yes they work much better huh lol...my dad always told me to change them at the start of every school year...so that they are a fresh pair for the winter...also have you heard of (Rain X ) you wipe it on then wait a few min. then wipe it off it helps repel the water...good luck...How often are you supposed to change windshield wiper blades?
you should every 3 months.How often are you supposed to change windshield wiper blades?
When they aren't cleaning your windshield, make noice when they move. or are falling off.How often are you supposed to change windshield wiper blades?
when you wash your windshield and it doesn't clean the surface that when you change it and it also depend on how many time you wash your windshield using your wiper blades. so if you don't use it often i will say may be every 1 year.How often are you supposed to change windshield wiper blades?
every six months. Normally fall and spring.