Normally, summers are supposed to be hotter than winters because the axis of the Earth is tilted toward the Sun during the hot season. This mean that the north receive more energy from the Sun, days are longer and thus, it's hotter.
But I was wondering if some characteristics could make one area colder in summer (July in the north January in the south) than it is in winter compared to the rest of the same hemisphere.
- As a reference, I used July and January as the hottest months for the north and south hemisphere respectively.
- It can be anywhere on the planet.
- The area must be large enough, not just a mountain. It should be at least the size of a small country like Belgium.
- Ideally, I would prefer to avoid explanations that have their origin in space such as solar eclipses (anyway, I don't think it would work)
- The difference in temperature needs not to be large, 5 degrees will do.