Why Continental Interiors Have Extreme Temperature Swings

Continental interiors (e.g., Siberia, Canadian Shield, Central Asia, US Great Plains) experience extreme seasonal and diurnal temperature variations due to:

1. Continentality (Distance from Ocean) – Water has high heat capacity; it moderates coastal temps. Land heats/cools rapidly. Far from oceans → no maritime buffer.
2. Absence of Large Water Bodies – No lakes/seas to store/release heat. Exception: Great Lakes moderate nearby areas.
3. Dominance of Continental Air Masses – cP (cold, dry) in winter; cT (hot, dry) in summer. Little maritime (mP/mT) influence.
4. Radiational Cooling/Heating – Clear skies, dry air → rapid daytime heating, nighttime heat loss. Snow cover amplifies winter cooling (albedo + insulation).
5. Elevation – Many interiors are high plateaus (Tibet, Mongolia, Colorado) → lower pressure, thinner air → greater diurnal swing.
6. Prevailing Winds – Westerlies bring maritime air to west coasts; interiors receive air that has traversed land, losing moisture/moderation.
7. Sparse Vegetation – Deserts/grasslands lack transpirational cooling; bare soil heats intensely.

Result

• Annual range: >60°C (e.g., Verkhoyansk: -68°C to +37°C).
• Diurnal range: 20–30°C common in deserts.

Coastal zones enjoy maritime moderation; interiors endure the full force of solar geometry and atmospheric physics.