That's not very useful limit. First, the hottest temperature recorded was probably in some place like Death Valley, so the humidity was probably very low. Thus

That's not very useful limit. First, the hottest temperature recorded was probably in some place like Death Valley, so the humidity was probably very low. Thus there isn't nearly as much water is the air as indicated by the saturation pressure. Second, if you somehow did manage to have hot air fully saturated with water mix with very cold air, the hot air has much higher heat capacity (due to all the water in it). One cubic meter of -83C air has a mass of roughly 1kg, so a heat capacity of 1kJ/K. The heat of vaporization of water is about 2000kJ/kg, so by the time you'd condensed about 70g of that water, the cool air would have heated up to +55C (and that ignores the heat capacity of the hot air and the water). So it's pretty safe to say, yes it's a limit but not a very useful limit as it is so far above what's physically possible.