The following year, he helped lead the Eagles to another division crown. On December 19, in the 1948 NFL Championship Game, he would partake in one of the most famous weather games, as snow rained down on Shibe Park that made running an even more important commodity, as each team combined for over 300 yards on the ground to just 42 passing. Facing the Cardinals once again, he went 2-of-12 for 7 yards and two interceptions while running for 50 yards on 11 carries. However, Steve Van Buren would win the game on a touchdown run early in the fourth quarter to give the Eagles the one and only score needed to win Philadelphia's first championship, with Thompson and Van Buren each getting credit from coach Greasy Neale for the win. In 1949, the Eagles were even better, losing just one game as Thompson and the team would make it to a third consecutive NFL Championship Game. Facing the upstart Los Angeles Rams in a slew of mud, he threw for 5-of-9 for 68 yards with one touchdown and one interception. His 31 yard touchdown to Pete Pihos in the second quarter was both the longest pass he threw all day and the winning score, as the Eagles shut out the Rams 14-0.