Agree ref KWI - when we have an aircraft restricted to max OAT of 50 deg C, it's a bit restrictive. Flew a "patrol" over the city the other night - at 2100-local the OAT on the deck was 37, but at 1000 feet it was 47. No aircon when we're using the camera or FLIR, which makes life fun.
Used to operate AB205s in Oman. On the border, where we'd spend a fortnight flying up and down helping those poor Saudi-based oil companies back to their own side of the line after friendly discussions about navigational difficulties, the OAT was usually around 55 in the shade. Between sorties, we once put a min-max thermometer under my flying helmet and left them on the cockpit seat. Temperature mid-afternoon inside the bonedome reached 88 deg C.