Even looking at only residential use, typically associated with heating, no clear relationship is apparent. A much larger driver of demand than weather is the continued retirement of aged, coal-fired power plants and the construction of new, natural gas-fired generation for residential, commercial, and industrial consumption.
In the wise words of Outkast, try as we might, “you can’t predict the weather, Ms. Jackson”. And despite changes in weather patterns, as a general rule, people are going to need heating in the winter and cooling in the summer, which is good news for MLPs who transport energy all over our great nation. So, as our resident astrophysicist and fellow lover of holiday music would tell us, Keep Calm and MLP On.