Summer is hotter than winter, right? Ever wonder why summer is warmer than winter, and why Phoenix is hotter than Fargo? The answer to both of these questions, of course, has to do with how much heat is coming into the atmosphere, and how much is going out.
The sun’s rays are much more directly overhead in the summer because our side of the Earth is pointed towards the sun and less directly overhead in the winter. Likewise, the sun’s rays in Phoenix are more direct over a longer part of the year, so it is warmer than Fargo.