It's a weird question, but we all have different body types and different situations under which we can write best. I have a hard time writing or focusing on anything when I'm cold. I reallyreallyreally hate being cold.
Being hot can be problematic too, but I don't think it's such an impediment to my writing.
Or maybe I'm just all focused on the cold because it's December and it's the midwest and it's freeeezing in my bedroom.
Anyhow. I think temperature is relevant to the creative process. What do you think?