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CLIMATE


The climate in the municipality is classified as Type I where there are pronounced dry and wet seasons — dry between the later part of October and the month of April, and wet during the rest of the year.

Bontoc is annually visited by typhoons with the highest rainfall gauged during the months of July and September. The Department of Agriculture recorded the average annual rainfall in Bontoc at 180 mm. Average temperature reaches 19.4 degree Celsius with temperature at its highest in the months of May and June. 

Atmospheric Temperature

Bontoc has an average of 19.4 degree Celsius. The temperature is at its highest on the months of April to June. January to February usually is the coldest months where the temperature reaches less than 10 degree Celsius. Warmer months are experienced in the March and April while cooler temperature experienced from November to February.

Relative Humidity

During 1988 to 2000, the PAG-ASA recorded 83.90% for the month of December. This is the lowest humidity in the last 12 years while the highest humidity was recorded 91.79% in the month of August. For the last 12 years, Bontoc has an average humidity reaches 87.40%.

Cloudiness

The mean annual cloudiness is about 11oktas. An okta is the number of days in a month when the sky has at least 75% cloud cover. Month of April has the least while July has the most number of cloudy days.

Rainfall

Bontoc has an average rainfall of 326.76 mm. The highest rainfall is experienced in the months of July to October and the lowest rainfall is within the month of January.

Table 2.5 Climatological Data, Bontoc, Mountain Province.

Months

Annual Rainfall

mm

Temperature

ºC

Humidity

%

January

9.4

18.1

84.74

February

24.9

18.6

84.81

March

73.5

19.8

85.61

April

258.3

19.8

84.44

May

287.6

20.5

88.38

June

426.3

20.4

89.07

July

846.0

19.8

91.11

August

604.5

19.5

91.79

September

681.2

19.5

89.57

October

595.6

19.6

89.16

November

92.8

19.0

86.28

December

21.0

18.2

83.90

Total (average)

326.758

19.4

87.40

Source:   Pagasa, 2010

Natural Hazard/ Constraints

There are two potential natural hazards or physical constraints to the development of Bontoc. These are Erosion and Fault lines. Flood also is considered to be another natural hazard in the areas along the Chico River.

Erosion

All the 16 barangays except Poblacion are prone to erosion especially in those areas of more than 30% slope

Fault lines

There are several major faults that could affect the municipality, namely: Philippine fault – active fault where an earthquake with intensity 7.8 on the Richter scale occurred; the Digdig and Baguio faults are potential earthquake generators being attached as north lateral splices of the Philippine fault. Minor landscape deformations such as joints, fractures, shear and gorge zones are manifestations of past fault activities and intrusions. These major faults (lineaments) found by the Phivolcs in the municipality are presented in the Development Constraints Map. Fault 1 passes through the western flank while Fault 2 on the eastern flank.

Table 2.6       Major Fault lines

Name of Fault Line

Number of Splice(s)

Traversed Barangays

Digdig Fault

1

Gonogon, Balili, Bontoc Ili, Guina-ang; and Mainit

Source: Phivolcs, Quezon City