Cave Air Dynamics
A difference in air temperature and/or density between openings or even portions of an opening can lead to observable airflow.
These air density differences are usually small and tend to be seasonal and/or diurnal in nature.
Low to moderate levels of air flow can occur in response to daily and seasonal temperature fluctuations, depending on cave size and geometry.
Cold air can be trapped in low spots and lead to ice accumulations where a single entrance is present and the interior recesses are significantly below the opening.