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Relative humidity usually follows a diurnal cycle
with a maximum around dawn and a minimum during the mid-afternoon.
Relative humidity varies between 70% and 80%, which makes the climate
humid in general, but pleasant.
Annual average evaporation varies from 1805 millimetres
along the north coast at Laga to 607 millimetres at Fatu-Bessi,
located at1120 metres. Evaporation is at a minimum during the first
half of the year, rising to a peak around September.
Due to the constancy of the temperatures along the
year, it has been hard to draw a useful climatic classification.
Most authors prefer a classification based on rainfall, such as
Schmidt and Ferguson which defines the number of dry months (rainfall
bellow 60mm) and wet months (rainfall above 100mm) and uses these
to determine a total of eight types of climate (from A- humid area
to H- dry area).
Climate data are available until 1975 from 35 climate
stations and 25 rainfall stations. Here we present the original
data in various formats and also many studies and maps produced
by various authors over the years. Edgar Sousa's fameous "r" has served
as the base for many studies. Other important documents reproduced
here are Keefer's "", Silver´s
""and many maps produced by GERTIL and
ALGIS. Luis Esteves presents some unpublished data.
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