RAINFALL Rainfall is the amount of the precipitation (rains, hill Etc) expressed in millimeters (mm) depth of the layer of the water that has fallen. Climatologically normal gathered from 1961-1995 at Ambulong Batangas being the nearest station showed that most number of rainfall occurred between May to December within the month of July having the most number of rainfall at 335.9 mm. RELATIVE HUMIDITY Relative humidity expressed percent, is the ratio of the amount of water vapor in the air to the maximum amount the air can hold at the given temperature. The average relative humidity I Calaca is 77%. September has the highest recorded relative humidity with 83%. The lowest recorded relative humidity occurred during the month of March with 71%. TEMPERATURE Annual average temperature is 27.5°C. May is the warmest month with mean temperature of 29°C. January is the coldest month with a mean temperature of 26°C. VAPOR PRESSURE Vapor pressure in Calaca has annual average of 27.7 mbs. The month of April recorded the lowest vapor pressure at 27.1 mbs while the highest recorded vapor pressure is during the month of June with 30.0 mbs. Mean Sea Level Pressure The mean sea level pressure is the force exerted by the weight of the atmosphere on a unit area at mean sea level. It is the atmospheric pressure at mean sea level. The average annual mean sea level pressure is1010.1 mbs. The lowest mbs and the highest recorded sea level temperature are 101.7 mbs, which is recorded during the month of January and February. Prevailing Winds The direction of prevailing wind is the most frequently observed during period while the average wind speed in the meter per second is the arithmetic average of the observed wind speed.
The prevailing wind during the month of January to April is the Northeast with a recorded speed of 2 mps. It shifted to Southwest in May to September with a speed of 1 mp during the month of May to June and speed of 2 mps from July to September. From October to December the prevailing winds returned to Northeast with a speed of 2mps. The annual average prevailing wind is northeast with 2 mps wind speed. Generally, Calaca belongs to Type I climate characterized by having two pronounced season: wet, from May to October; and dry, from November to April. Land Capability The coastal ecosystem has land capability class moderate soil condition limitations with shallow profile, low fertility, doughtiness, and slight salinity. Those adjacent to streams and rivers have low to medium fertility, susceptible to seasonal overflow, and have a slight soil condition limitation. The lowland ecosystem has a land capability class of slight soil condition limitation, with deep soil profile having loamy to clayey soil with none to slight flooding hazard and possible severe erosion in some areas. The upland ecosystems have moderate soil condition limitation with none to slight flooding hazard severe erosion. SOIL SUITABILITY The coastal ecosystem has the moderate to high suitability rating for residential and recreational use. Agriculture is not generally advisable in this ecosystem. The lowland ecosystem is moderately and high suitable for residential, recreational and light industry purposes. Wet diversified crops, pasture tree crops and industrial trees are fairly to moderately suitable in this area. The upland ecosystem has moderate to high suitability for residential and recreational use. Barangay Bambang, Bisaya, Tamayo and Cahil have poor to moderate suitability for residential and recreational uses. All these Barangays, however, have high suitability for forest use.
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