How does the Humboldt Current affect Lima’s climate?

The Peru (Humboldt) Current is a primary factor in shaping Lima’s temperate, arid climate. By cooling the coastal air mass, the current stabilizes the atmosphere and prevents the formation of significant precipitation, contributing to the region's status as one of the world's driest areas.123

The current’s influence manifests in several ways:

• Temperature Regulation: The cold water keeps the city’s temperatures moderate year-round, preventing extreme heat despite Lima's tropical latitude.1
• Cloud Cover and Fog: The cooling of the air creates a persistent layer of stratus clouds and dense sea mist, known locally as garúa. This mist often blankets the city during the winter months (May to November), providing the only significant source of moisture, as annual rainfall rarely exceeds 2 inches (50 mm).14
• Atmospheric Inversion: The current causes air in contact with the water to cool more rapidly than the air above it, creating a temperature inversion that traps cool, cloudy conditions near the ground and prevents the sun from reaching the city for much of the year.4