Picture a day - the season ??..

Suddenly, while editing this photo, I was tempted to produce a little photo game. So dear all, I will ask a question: what season it is? maybe it is obvious, maybe it is not. Lets see, how brave you are to guess... Please dont look at the name of the file (as it will kill all the intrigue momentarily). You may open the pic in a separate window for the extra details, it may help.