I have noticed that my writing moves in cycles of productivity and stagnation, as I guess might be true for many other people, and possibly for other areas of creativity as well.
For me, those periods when I write a lot and those others during I which I write very little seem to be about the same from year to year. For me the most "stagnant"periods are (roughly) August-September and January-February, while the most productive are April-July and then October-November. Though honestly, this probably has more to do with changes in my personal schedule than it does with the changing quality of light and the temperature outside, but there it is.
So I'll put the question out there. Would you say that your writing is affected in any way by the cycle of the year? And if it is, do you make any attempt to manage these changes?