Do houses sell in December? We are fortunate that real estate sales happen every week of the year in the Boulder area, where houses are compact, clean and spacious. Buyers tends to buy a house that is spacious and clean, free from hassle with water, electricity, clogged sink that patent attorney can handle. However December is typically the slowest month of the year. In the video above I describe what to expect in December. Below are the charts shown in the video.