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Climate
Type
The Hernandez type of
classification under PAGASA defines the climate of the
province as generally arid (Type E) wherein there are more dry
than wet months. At most, there are only 4 ½ wet months in
a year with Q ranges from 1.00 to 1.67, where Q is the ratio
of the number of dry months to the number of wet months.
However, the southernmost
portion of the province (part of the municipality of
Cervantes) was observed to be humid (Type B), where rain is
evenly distributed throughout the year with at most 3 dry
months and the eastern part of Sugpon is dry (type D) with
rain not sufficiently distributed with at most 6 dry months.
Temperature
The mean annual air temperature
in the province is 27°C.
April and May were observed to be the hottest months with
temperatures of 28.3°C
and 28.7°C,
respectively, while the coldest month is January with a
temperature of 25.4°C.
Rainfall
The total
annual rainfall in Ilocos Sur is 2,552 millimeters, with a
monthly average of 213 millimeters. Maximum rainfall is
observed during the month of August with a mean rainfall of
710 millimeters, with rainfall means of 3 and 6 millimeters,
respectively.
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