Ask yourself "How were my wiper blades working when it last rained". If you were not happy with your answer, you should have them inspected at your local Pro Oil located on 1009 Talbot St. and possibly replaced.
There have been many advancements in wiper blades. Most newer vehicles are equipped with a beam (high performance) blade. These blades provide a significant advantage over traditional blades, providing the ultimate vision possible. They give a better cleaning experience by utilizing infinite pressure points, less wind lift and a lower visible profile. The concealed parts safeguard the blade from damages of snow and rain and beam blades can be retrofitted for older vehicles giving everyone the safety they deserve.
How were my wiper blades working when it last rained? If you are not happy with your answer, you should have them inspected and possibly replaced. Since wiper blades are not used every day and are exposed to various weather conditions there is not a precise mileage or time interval for when to replace them.