I think it would be important to get thermometer readings rather than rely on 'feel.'
Could the temperature spike ten degrees in the noon sun? Sure, it's possible. But when it stops and there's no breeze, is that what happens, or what it 'feels' like it happens?
Human beings are a poor judge of absolute temperatures. Just look WDW when it's 65 degrees. The Floridians are wearing jackets and the Northerners are in shorts and Ts.
Same when a breeze stops. The breeze was evaporating sweat. When the breeze stops, evaporation rate slows down and it 'feels' warmer. That happens sitting outdoors in shade or sun. But, it's the same temperature with or without the breeze.
So, when the breeze within the gondola stops, and it 'feels' warmer, is that because the breeze has stopped or because the temperature spiked?