Yep, my concern too would be high-ambient, for air-cooled. Getting some heat into it, this time of year, Not a Bad Thing....these are basic lawn mower engines, splash lube, no oil filter, so clearly not suited for long oil intervals.
We have more bad weather coming or I might change the oil tomorrow, otherwise will wait til after next run.
I think I'd be more concerned if it was 95 out vs 28.
easy to use suction oil changer, only takes about a quart
Long enough run; you'd have a low-oil shutdown on it, but sounds like you are not using any
Good luck d, and hopefully they are back up before 6. Crazy CO story you related !
Rgds, D.