Your answer to this question will depend greatly on many different factors. As for me, I’m partial to Fall and Winter. The reasons this are simple, it’s cold outside. 😀 Staying indoors gives me ample time to write.
Also, in Fall, love to sit out on the deck and write. Because the air is crisp, the leaves are turning, and the animals are running wild.
Winter allows me to curl up next to the fire with my laptop and write all day long.