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World's Mildest Climates - Mild Oceanic Islands - True Luxury
2006-06-27
Measuring the mildest climate
Sum of HDD and CDD and Eternal Spring
Energy requirements for heating and cooling, measured in heating and cooling degree days, HDD and CDD. For european races the magic words are eternal spring, the magic daily average temperature is 18° (65°F).
The most rapid way to check how close a climate is from eternal spring is, is to add both. The lowest sums of heating and cooling degree days in the world is the way to locate the world's mildest climates. Allowing a departure of 3°C from the usual 18° C (65 F) base, this results in a 15°C to 21°C comfort range, used as base for HDD and CDD
Types of Mildest Climates
Mildest Littoral Climates vs. Eternal spring of Tropical Highlands
Eternal spring can be found only in the tropical highlands. And the price to pay is always some combination of high daily amplitude ranges and extremely high relative humidity, close to saturation.
The closer a station is to the littoral the smaller the thermal amplitude range will be: daily, monthly, yearly. And along the same coast, the closest to sea level the station is, the lower the relative humidity will be.
Spring and mild summer or eternal mild summer
In the littoral, the closest to eternal spring you can get is:
- a combination of spring and mild summer, found first of all in some coasts of some oceanic islands in the mild subtropics.
- eternal mild summer, found first of all in windward coasts of some oceanic islands at the end of the tropics.
Mild Oceanic Islands - true luxury
Mild Tropical Oceanic islands - at the border of the tropics
There are tens of thousands of islands in the tropics, all with rather similar temperature patterns. But which exactly are those oceanic islands of eternal mild summer, at the border between tropics and subtropics?
The answer is: very few. Only the windward coasts of the Hawaii islands and to a less extent the southern tip of New Caledonia, including the Isle of Pines.
Mild Subtropical Oceanic islands
There are tens of thousands of islands in the tropics, all with similar temperature patterns. But which exactly are those subtropical oceanic islands combining spring and mild summers?
The answer is: very few.
The list matches the few oceanic islands geographically located in the subtropics, between latitudes at the lower thirties and the tropics, that are not not affected by any unfavorable combination of factors, extended with the Azores islands, which are located between 37° and 40°.
World's Mildest Climates
This list of the Mild Subtropical Oceanic islands actually equals the top of the list of the world's mildest climates.
The littoral WMO stations with the lowest sum of heating and cooling degree days in the world, using a 3°C departure from the usual 18° C (65 F) base, i.e. using the 15°C to 21°C range as base for HDD and CDD, are: Lord Howe Island, Norfolk Island (Australia); Porto Santo Island and Funchal, Madeira Island; Santa Maria Island, Azores Islands, in the North Atlantic (Portugal) and Las Palmas, Canary Islands.
Besides other stations in the Azores and Canary Islands, we find only two more islands, Rapa (Austral Islands, France) and Easter Island (Chile) in the South Pacific, and the first eternal mild summer Hawaiian stations until we see the first littoral station which is no more located in an island, Mossel Bay, South Africa.
After the subtropical oceanic islands, Hawaii and South Africa's Garden Route, come the mildest stations in the southern californian coast and southwestern Iberian coast from Malaga, Spain (Costa del Sol) to Lagos, Portugal (Algarve). and finally the mildest mediterranean island station.
Ilena Lo
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