If both your next door neighbours put identical houses up for sale at the same time, it may be a bad idea for you to do the same. So once again, try to follow the markets and read the signs. Following the news on this site should keep you in the picture. In terms of the four seasons, autumn generally sees the housing market slow down. The reason for this is that winter tends not to be such a popular time for buyers, with the Christmas period a time when few people like to be moving house.
Most buyers tend to prefer to wait until the new year.
Having said that, some properties have certain characteristics that are best seen at certain time of year. The sun may set beautifully giving rise to a fantastic view from one of the rooms for only a few months of the year or you may have a fantastic view during the winter months, which is obscured by greenery during the summer. At the end of the day, much depends on your property. If it is in a sought after location, you should have no problem selling at a reasonable asking price regardless of the time of year or market conditions. Then again, if there are strong reasons that may put buyers off from acquiring your property, these are likely to be valid objections regardless of whether demand has gone through the roof in the market as a whole.