The dark and cold of January is most difficult at the mornings and evenings. When dusk comes at late afternoon. At our house we have a recurring, never fruitful discussion about possibly going south for a vacation in January.
There is a good book, Frederick, by Leo Lionni, in which a lazy mouse, instead of gathering food, gathers summer memories. Then in the depth of winter he releases these memories to warm his friends. For some reason kids especially enjoy winter themed books.
I find that memories of hot summers don't do much for me this time of year, except increase the longing for winter to end. Better to accept the pleasures of winter: beautiful quiet snow, hot cocoa, soup and warm bread, clothes warm out of the dryer, candle light, reading books under covers or finding camaraderie in a warm watering hole: