Not all of Siberia is equally harsh—southern and western areas are more moderate—but the core region experiences extreme conditions due to a combination of geographical and atmospheric factors:
Far from oceans, Siberia receives low solar radiation in winter and lacks maritime temperature moderation, creating a classic continental climate.
Massive cold air masses form over the Asian landmass in winter. With no major mountain barriers to block them, they sweep freely across Siberia.
Perennially frozen ground acts as a thermal insulator, preventing summer heat from penetrating deep and reinforcing year-round cold.
High latitudes mean extremely short winter days (or total darkness), drastically reducing solar heating.
A massive, persistent winter high-pressure system brings clear skies, calm winds, and radiative cooling—allowing temperatures to plummet.
Unlike western Europe (warmed by the Gulf Stream) or eastern Asia (Kuroshio Current), Siberia is shielded from oceanic heat transport.
Together, these factors create one of Earth's most extreme climate engines.