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Abstract: The Philippine archipelago has a warm climate with distinct wet and dry seasons and with high variations in rainfall throughout the 7,100 islands. The average annual rainfall varies from 375 to 1,000 mm. The average temperature is 27.05°C and average relative humidity of 85%. The present population is 4 3 million in a total land area of nearly 30 million hectares with almost half forest and some 35% cultivated. The average density of population is 123.1 per square kilometer in 1970. In the same year, Manila had a density of 34,750 persons per square kilometer, one of the highest in the world. At the present rate of increase at slightly lower than 3%, the population is expected to double every 23 years. About 80% of all Filipinos living in rural areas (The Philippine Atlas, 1975).
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