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Contrast this, where relative humidity will almost never fall below 75 pct, with the south coast, at sea level, just a few kilometers away, where 27° C summer temperatures seldom come along with relative humidity above 65 pct.

In most of the Azores Islands, like in Hawaii windward coasts, relative humidity rises even more dramatically than mountains rise above sea level.

How dramatically? It will depend first of all on windward or leeward exposure, even if this factor is less important than in Hawaii, which has the same predominant winds all year long. In the case of the Azores, also on southeastern or northwestern coordinates.
From Santa Maria leeward south and east coasts, with about 500 mm precipitation at sea level, to Flores windward west coast, the only one in Europe recording more than 2,000 mm at sea level, and where relative humidity rises 20 pct per 100 meters altitude, reaching saturation as low as at an altitude of 300 meters.

Relative Humidity, the most important factor that protected most of the Azores from human settlements. Beyond the ultimate climate border.

More
- Mildest climates in the world - south coast of Sao Miguel
- The ultimate climate paradox / border