After four snowfalls in Autumn, accompanied by very rigid temperatures (up to -5°C.) and after the rain which has characterized the Christmas holidays, at the Grotta del Vento the epiphany has brought a glimpse of Summer, or at least a warm Spring. The air current, which normally in Winter gets sucked from the touristic entrance to rise up towards the openings situated in the top part of the Pania Secca has inverted its flow.
As in Summer, although less strong, a discrete air current can be felt by the visitors who walk through the first part of the underground route. A sign that the outside temperature (meant as the average between that of the touristic entrance and the openings higher up) is higher that average annual temperature, which determines the internal temperature of the cave, it has a rigorous stable temperature in any period of +10,7°C.
This inversion of flow, very unusual for this time of year, does not however have any importance to predict any meteorological events in the near future. The wind only has to change, that the mistral wind comes or the north wind, and everything goes back to normal, with a wind blowing in that is stronger the lower the outside temperature is. Until well into Spring, when after a few attempts the wind blowing out that characterizes the Summer season becomes stable again