MADISON, Wis. (AP) — Wisconsin's existing home sales fell 11 percent in March compared to the same period a year ago. The chillier winter is a possible factor. The Wisconsin Realtors Association says the spring selling season got off to a slow start, but things might improve along with the weather. The association says median sales prices rose 2 percent to $136,500. The first three months of the year are traditionally slow for home sales, with about 18 percent of annual sales in the first quarter. Sales in the second quarter generally comprise 31 percent of the yearly total. Real estate agents say better weather helps home sales not only because more buyers come out but because the landscaping is fuller and greener, making the entire home more appealing.