In fact, Lake Como always tends to be clement, despite being framed by snow-capped mountains, despite being so close to Switzerland. Palm trees and tropical plants thrive in its shielded climate, where the lake is so deep that it never freezes.

Lake Como almost never freezes due to its incredible depth and the high thermal mass of its water, combined with a relatively mild Mediterranean microclimate. As one of the deepest lakes in Europe (reaching 410 meters or 1,345 feet), the lake contains a massive volume of water that acts as a giant heat reservoir. During the summer, the deep water absorbs a significant amount of solar energy, and because water is most dense at 4∘C (39∘F), the cooling process in winter is extremely slow. As the surface water cools, it sinks, and warmer water from the depths rises to replace it in a constant cycle of convection. This prevents the surface temperature from reaching the freezing point of 0∘C (32∘F), even when the air temperature drops below zero. Additionally, the surrounding Alps protect the lake from the coldest northern winds, and the heat released by the water during the winter keeps the surrounding air significantly warmer than in nearby inland areas. Only in extremely shallow, sheltered coves during exceptionally rare "century freezes" would any ice be seen on this legendary Italian lake.