Variability of Rainfall and Temperature in Ilocos Norte, Philippines

Nathaniel  R. Alibuyog,; Evangeline  S. Galacgac,; Charito  G. Acosta,

Variability of Rainfall and Temperature in Ilocos Norte, Philippines

Evangeline S. Galacgac | Charito G. Acosta | Nathaniel R. Alibuyog

Abstract:

Rainfall and temperature variability in the Philippines had been holistically studied, but the extent of this phenomenon has not been explored in specific localities. As such, available daily data on rainfall and air temperature for the past 35 years (1976-2010) were taken from the MMSU-PAGASA Agrometeorological Station in Batac City, Ilocos Norte, and the cyclone data in the last 30 years from the Synoptic Station in Laoag City, Ilocos Norte were analyzed. Results of the analysis could provide local decision-makers with the needed information and tools to manage or mitigate the risks brought about by changes in weather. It was found that annual temperature increased from 27.1° C to 27.3°C, which deviated from the normal-base period. Moreover, the annual rainfall trend varied, but the monthly pattern significantly changed, and the maximum rainfall slightly changed. On the other hand, the number and intensity of tropical cyclone increased annually and deviated from the normal. Likewise, monthly trend and intensity remarkably changed. Based on these results, appropriate cropping calendars suitable to a given agro-ecological zone were developed.

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