The City of Winchester has a faboulous site full of great information. On that site, it states the Average Annual Snowfall is 26.2 inches. To visit that page, which is full of statistics, please cut and past the following link: http://www.winchesterva.gov/econ/whywinc.php
Over the past couple winters, we have had very little snow. Last year we had more ice then snow. In years past we have had 2 - 4 inches at a time, 3-4 times a year. Once in a while we get 6", but not that often.