I'm ambidextrous and can actually write well with both hands, and I do feel the seasonal differences over time. Try creatively writing with your non-dominant hand and the results will surprise you Trilby = creativity unleashed! ;)
http://www.nwitimes.com/niche/shore/health/using-your-other-hand-benefits-your-brain/article_6da931ea-b64f-5cc2-9583-e78f179c2425.html