Altitude
varies from sea level to 2,815m (9,606ft) at Mt. Pulong on Luzon
and 2,954m (9,692ft) at the highest point, Mt Apo on Mindanao.
At higher altitude it is always cooler. As further north from
the equator a place is located, as cooler it is in the months
of November to February. However, in April and May, northern portions
of The Country often experience higher temperatures than southern
parts.
It is often
a little cooler outside the big cities as Manila or Cebu because
concrete, asphalt and the lack of trees combine to soak up, retain
and reflect the heat.
Four types
of tropical and maritime climates are found: a dry and a rainy
season; no dry season; not very pronounced seasons; annd an even
distribution of rain throughout the year.
Generally,
along the east of the archipelago and to the east of mountain
ranges, there is more rain than on west sides. The southern Visayas
and Mindanao are a little more equatorial and rains may, but don't
have to, occur year round. Anywhere in The Country , rain is more
probable in the afternoons than in the mornings.
The primary
winds are the monsoons which blow from the southeast May through
October and from the northwest from November to April, and the
trade winds which blow from the northwest. Neither the northwest
monsoon nor the trade winds carry much rain to the western parts
of the northern islands.
The Filipinos
especially in the northwest part of The Country including Manila
divide their year into three seasons: winter from December through
February with dry, cool weather, summer from March through May
with dry, hot weather, and the rainy season from June through
November with thunderstorms and typhoons.
However, sometimes
there are anomalies in the weather pattern. For example, in 1985,
June had almost continuous rainfall in most of Luzon, and after
that, no more; in 1986 there was a typhoon as late as the end
of December; and in 1987, November and December had more rain
than the supposed rainy season in the months before.
Barometric
pressure in central Luzon including Manila is usually between
1000 to 1005mb (29.53 to 29.68in) November through May and 995
to 1000mb (29.38 to 29.53in) June through October. The rate at
which the barometric pressure rises or falls is a better forecaster
of short term weather than the media. A rapidly falling reading
indicates a coming storm or typhoon while a rapidly rising one
shows the storm has passed or fair weather is in store. It does
not forecast brief showers. During the rainy season, it is advisable
to carry an umbrella at least in late afternoons.
The minimum
annual rainfall varies throughout The Country from 965mm (38in)
to 4,064mm (1,600in). The monsoon rains are pulled in by hurricanes
or, as they are called in the Pacific, Typhoons.
Typhoons (the
native term is bagyo) are common from June to October and they
generally affect a wide area, sometimes half of the archipelago.
They all come from the Pacific ocean in the east and contain winds
of 120km/hr (74mi/hr) or more moving in a circle and an almost
windless "eye of the typhoon" moving to the west or northwest
with 17 to 25km/hr (10 to 15mi/hr).
Typhoons are
given feminine names. They follow the the Filipino alphabet of
19 letters which is about the average number of cyclones entering
the Philippine area of responsibility, i.e. the area near The
Country for which the Philippine Atmospheric, Geophysical, and
Astronomical Services Administration (PAGASA) is responsible for
tracking and reporting. It doesn't mean that PAGASA is responsible
for the typhoon. If a particular typhoon causes destruction of
one billion pesos or the death of 300 or more people then that
name is removed from the list of names that PAGASA uses, otherwise
the same name may occur in subsequent years. Some storms whose
names have been removed in the past 10 years are Aring (1980);
Nitang and Undang (1984); Herming and Sisang (1987); and Unsang
and Yoning (1988).
There are
several intensities of typhoons, which are usually announced in
advance in the newspapers, on radio and TV. Signal 1 is the weakest.
When signal 2 has been announced, elementary and high schools
and some offices and shops are closed, still depending on the
flood conditions. During a signal 3, all schools, government offices
and most private offices are closed.
But even with
signal 1, things start going haywire. There are traffic jams because
of the floods, and employees in many businesses come late.
The actual
typhoon generally takes only 1 day. But often the day before and
the day after also are rainy and windy. It is easy to determine
whether the eye of a typhoon is passing because there is neither
rain nor wind but is sunny and calm.
Some areas
of Metro Manila become almost inaccessible after several hours
of heavy rain. This is negligible in Ermita, Malate and Makati,
but Tondo, Sampaloc, parts of Quezon City, and outskirts of the
metropolis like Valenzuela and Taguig are always strongly affected.
Every year
typhoons cause hundreds of people to die, not to mention large
economic losses The Country suffers each time the weather gets
severe. The worst typhoons in the last few years were: Sisang,
November 26, 1987, which killed more than 650 people in the Bicol
region of south Luzon and rendered more than 500,000 homeless;
Gading, July 6-10, 1985 with almost 100 dead; and Undang, which
left almost 900 dead when it swept over the Visayas November 3,
1984.
The weather
predictions of PAGASA, are generally reliable. Sometimes the forecast
goes wrong, but one has to admit that the weather itself at times
does not behave as it should. It has been known for a typhoon
to swing back on itself and to return.
The rainy
season is not necessarily a bad time to visit the city since the
sky is cloudy, shielding one from the burning heat of the sun,
and the temperature is comfortable with a soft breeze. Moreover,
aside from times of typhoons it often rains only for two or three
hours, usually in the afternoon.
The mean annual
temperature is 26.5C (80F). Temperatures are measured in the Philippines
in degrees Celsius.