[Gaz64]

Rick,

Fairly typical of carburettors that breath only from one location.

The car makers did it better with thermostatically controlled air inlet, (a mix of cold outside air and heated air from the exhaust manifold).
The carburettor was calibrated for a higher than average ambient temperature.
Any carbed car especially race cars benefit from as cold an air temp as possible, then the carb is calibrated for that temperature.
Either side of that temp, the calibration will be rich or lean. Racers use a density meter to jet their carbs at the track from previous data collected.
Cold air is more dense, so more oxygen is available for combustion, more oxygen means more fuel needed to be correct A/F=more power.