Your experience has not encompassed enough of the earth to provide enough information. If the earth is flat, a drive from Washington to Baja gets you, what, 30% closer to the ice wall? At the same time, it gets you 50% closer to the sun (if not more than 50%).
That made me laugh. Thanks. Since the Earth is flat and only about 25,000 miles across, and the Sun is 93 million miles away the difference from any place on Earth to the sun is negligible, the angle being so tiny. So 50% is WAY off. As a percentage it would be closer to .00000000001%. I hope your facility with math is not representative of all Rounders.
BUT, you did chance on something that gives me a potential solution to the problem I posed. Indeed, I did not travel far enough 'South.' You see, there also is, at the very center of the Earth, an enormous mass of ice and frigid dirt called the Arctic. So, as I traveled away from that ice mass I got warmer. At the halfway point, what YOU call the 'equator,' I expect I would start to get colder as I approached the Ice Wall.