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At sea level, the temperature can vary from 20°C to 31°C. However, the climate is not as hot as it might seems; indeed, the heat of the sun is outweighed by the sudden gusts of wind which blow over the island.

Forever veiled by clouds, "Green Mountain" possesses a true microclimate. The surrounding temperature is 6°C less than that which prevails at sea level while the degree of humidity can easily reach the 100%.

Rain falls all year round with slightly more significant downpours in the period of January to April.

It is in December, the hottest period of the year, that we can observe the arrival of turtles and the occurrence of the "swell" phenomenon which is aptly described as the breaking and collapsing of huge rollers on beaches in a thundering crash. This particular occurrence always arouses the same question in our minds: how can we be having such heavy and swelling waves especially when the wind has not gained high speed?

To better understand this phenomenon, we should distinguish between the sea waves and the swell waves. Sea waves, which are generated by winds, are natives of the surrounding area while the stormy waves, which originate from the Atlantic Ocean, are formed in remote zones 3’000 km far and managed to make the trip to the coasts of Ascension. The hurricanes in the surroundings of the Falkland Islands can generate huge waves that will reach Ascension four to six days later. During the winter season in the Northern Hemisphere, hurricanes or tropical depressions of the North-Atlantic Ocean produce gigantic waves that can easily voyage across the Equator and thus develop into the most spectacular rollers. Although the sea appears to be calm, the swell gives no warning before taking over the smooth waters. Therefore, it is important to maximize caution while swimming and to avoid beaches that are not sheltered by coral reefs.

Here, the days are short and brief; the sun rises at 6h30 and sets at 18h00. The blend of heat and humidity dissipates daylight and provides an excellent explanation for the "foggy" landscapes.

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