As far as I remember, Riyadh is a hot and high altitude airport.
You are absolutely correct...RUH in the summertime is not for the unwary.
SO let's summerize it:
40 deg C on ~2000 feet MSL is "hot an high" airport ??
and should not be used by unwary....?
PS no1. Dubai with sooooo many flights per summer days, even if at ~MSL,
but >50 deg C.....is OK for "unwary pilots" ??
PS no2. In Narita on that day, shall we assume also "hot and high" airport and "unwary" pilots ?