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Climate

Although the islands are located on the equator, the Humboldt Current brings cold water to them, causing frequent drizzles during most of the year. The weather is regularly influenced by the El Niño events, which occur every 3 to 7 years and bring warmer sea surface temperatures, a rise in sea level, greater wave action, and a depletion of nutrients in the water. This cycle can greatly affect the precipitation from one year to another. At Charles Darwin Station, the precipitation during the month of March in the particularly wet year of 1969 was 249.0 mm (9.80 in), but during March 1970 the next year it was only 1.2 mm (0.047 in).

There is also a large range in precipitation from one place to another and across the islands' two main seasons. The archipelago is mainly characterized by a mixture of a tropical savanna climate and a semi-arid climate, transitioning to a tropical rainforest climate in the northwest. During the rainy season known as the garúa from June to November, the temperature near the sea is around 22 °C (72 °F), a steady cool wind blows from south and southeast, frequent drizzles (garúas) for days, and dense fog conceals the islands. During the warm season from December to May, the average sea and air temperatures rise to around 25 °C (77 °F), there is no wind at all, and the sun shines apart from sporadic strong downpours. Weather also changes as altitude increases on the larger islands. Temperature decreases gradually with altitude, while precipitation increases due to the condensation of moisture from clouds on the slopes. This pattern of generally wet highlands and drier lowlands affects the plant life on the larger islands. The vegetation in the highlands tends to be green and lush, with tropical woodland in places. The lowland areas tend to have arid and semi-arid vegetation, with many thorny shrubs and cacti and areas of barren volcanic rock.

Some islands also fall within the rain shadow of others during some seasons. During March 1969, the precipitation over Charles Darwin Station on the southern coast of Santa Cruz was 249.0 mm (9.80 in), while on nearby Baltra Island the precipitation during the same month was only 137.6 mm (5.42 in). This is because Baltra is located behind Santa Cruz when the prevailing winds are southerly, causing more moisture to fall on the Santa Cruz highlands.

The following table for the especially wet year of 1969 shows the variation of precipitation in different places of Santa Cruz Island: