In a small car with a superb A/c when I came through Lukeville AZ in 2010, the interior of the car was 107F. The outside temp was 122F+ unless of course a person doubts my Ashcroft lab mechamical thermometer. In your wildest dreams you cannot imagine the brutal effects of such a temp. Roll down the window and yell with pain. It's like holding your hand in front of a hair dryer. Under a shed roof pass through the Border Patrol had six of the largest swamp coolers I have ever seen.
A dial type thermometer read 117F.
Unless you have experienced temps like that my advice is to remain humble. It is frightening. When I passed by the hotel parking lot thermometer it read 101F one minute past midnight.