In my area there are fewer homes on the market during the winter and fewer buyers. It could be a great time to find the right house. If you are the seller the best time to place it on the market would be Early March around here- but people often need to sell when they need to sell. A house put on the market in December 2014 may sell a lot better than one put on the market in March 2015 if interest rates go up in response to the Fed Reserve stopping the Bond buy back.

It is better in the spring and summer near the end of the school term.

No. Spring is the peak time for housing sales.

no - house sales decrease in winter