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MONTHLY WEATHER BULLETIN

AUGUST 2017

 

Introduction

The country was in second phase of Southwest Monsoon.  Most places were wet during this month.  The amount of rainfall, temperature and solar radiation recorded were above average values throughout Malaysia. However, the rate of evaporation was below than average in most places.

Besides the early morning ‘Sumatras' and local topography effect, two typhoons over South China Sea and Philippines Sea, namely "Phakar and "Mawar" had influenced the weather pattern of the country.

 

Rainfall

Most places in Peninsular Malaysia were wet during this month, particularly Prai, Pulau Langkawi, Alor Setar and Melaka which recorded more than 400mm of rain.   Prai and Gong Kedak marked a new highest monthly rainfall for the month of August with a total of 461.8mm and 397.8mm respectively.  A new daily highest rainfall was recorded at Prai on 13 August with a total of 176.2mm, Petaling Jaya with an amount of 111.0mm on 25 August and Melaka on 10 August with 151.8mm of rain.  However Sitiawan and Butterworth had much below average rainfall during this August.

Over Sabah and Sarawak, most places recorded above average amounts of rainfall.  Kapit and Labuan break the record for the highest monthly rainfall amount for August with a total of 516.0mm and 929.8mm respectively.  

Temporally, more rainfall was distributed during the first half of the month. Spatially, rainfall was not evenly distributed.  Some places received a lot of rain particularly over northern part while a few places in coastal of Perak and Pahang had less rainfall.  Cameron Highlands recorded 26 days of rain, the highest number of rain days in Peninsular Malaysia while Kota Bharu and Kuala Terengganu recorded on 15 days of rain, the lowest of rain days for the month.  Over Sabah and Sarawak, the highest and lowest rain days was in Ranau (26 days) and Kudat (15 days). 

 

Temperature

Most places recorded higher than average temperature.  Over the lowland areas, Kapit had the highest maximum temperature of 35.6°C.  While Ranau recorded the lowest minimum temperature of 18.9°C. The only highland station at Cameron Highlands had temperature ranging from 14.5°C and 24.6°C.

 

Solar Radiation

Over the lowland areas, the mean daily solar radiation ranging from 7.73 MJm-2 at Kudat to 25.28 MJm-2 at Tawau.  The mean solar radiation recorded at Cameron Highlands was 14.07 MJm-2.  The highest positive deviation of +8.75 MJm-² was recorded at Subang while the lowest deviation of -1.66 MJm-² was recorded at Senai.

 

Evaporation

The daily mean evaporation rates for lowland areas ranged from 2.7 mm/day at Batu Pahat and 5.16 mm/day at Kudat.  The highest positive deviation of +1.5 mm/day was at Chuping and lowest negative deviation was -0.9 mm/day recorded at Kota Kinabalu.  Meanwhile, the rate of evaporation at Cameron Highlands was 1.79 mm/day with deviation of -0.1 mm/day.

 

Figures :

FIGURE 1   : Rainfall Map for Malaysia

FIGURE 2a : Mean Monthly Temperature

FIGURE 2b : Mean Monthly Maximum Temperature

FIGURE 2c : Mean Monthly Minimum Temperature