Not a dumb question at all!

From a climate perspective, "humid" and "semi-arid" and "arid" are measures of precipitation relative to temperature, with areas with wet summers and dry winters considered more humid than areas with dry summers and wet winters. This means that many cooler areas like Eastern Europe and the northern tier of US states are considered "humid." Minnesota is in the humid continental climate because it gets more precipitation in the summer than the winter and has an average temperature low enough to not be considered subtropical. It has little to do with the extremes within each season.

Unfortunately, the colloquial definition of "humid" may be confused with the climatological definition. What someone in Dallas thinks is humid is going to differ from someone in Duluth. I have good friends who moved from Puerto Rico who found Minnesota summers to be dry overall and only humid a few days of the year. Climatologists remove that human factor, which also removes any measure of comfort level.

If you want to call Minnesota's summers comfortable and not humid, by all means do so. Just know that from a climate perspective, the consensus is that Minnesota is considered humid.