Many people believe in the myth that the Spring is the best time to sell...Perhaps more people are shopping in the spring, there is more selection, and patio and outdoor space shows better when flowers are in bloom. In a buyers market, there might be some benefit in listing when your home is looking its best. But now that we are in a sellers market, the weather doesn't significantly if at all effect the price. The current market is up higher than it was last spring because of demand and lack of inentory, so seasons don't really come into play. Serious buyers are always looking, they don't go away because leaves are off the trees and the temperature is colder.
Happy home selling!