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MOnthly weather bulletin AUGUST 2007 1. SUMMARY In this month, generally most places in Malaysia received average amount of rainfall and recorded above average temperatures, solar radiation and rates of evaporation. 2. RAINFALL Climatologically, August corresponds to the tail end of the generally dry Southwest Monsoon. Most places in Peninsular Malaysia experienced dry spell during the first ten days of the month. This was due to the deepening of the elongated monsoon trough over the western Pacific. Thus, most of the countries over northern Asia received more rainfall while the southern Asia experienced dry condition. However, by the end of the month, the monsoon trough had weaken thus enhancing the convective activities over Peninsular Malaysia, Sumatera and Kalimantan. As a result, more rainfall was recorded during this period. The total amount of rainfall recorded was average to much above average. Over East Malaysia, Sabah and Sarawak received average to much above average amounts of rainfall. However, most places experienced dry spell during the first half of the month. As for total monthly rainfall, Pulau Langkawi recorded the highest total rainfall of 387.0 mm where as Kuala Terengganu recorded the lowest total rainfall of 47.0 mm. Over East Malaysia, Kota Kinabalu recorded the highest total rainfall of 318.8 mm while Miri recorded the lowest total rainfall of 102.2 mm. Based on the classification scheme, there were 2 stations recorded very much above average rainfall, 3 stations recorded above average and 24 stations recorded average rainfall. The number of rain days for Peninsular Malaysia varied from 8 to 19 days while East Malaysia recorded 11 to 19 days. 3. TEMPERATURE The monthly mean temperature of lowland areas varied from 25.8°C in Senai to 28.2°C in Labuan. The largest positive deviation from normal (+0.6°C) was recorded in Mersing. The monthly mean minimum temperature of lowland areas ranged from 22.6°C in Kuala Krai to 25.2°C in Labuan. The lowest temperature of 21.1°C was recorded in Kudat. The monthly mean maximum temperature of lowland areas ranged from 30.4°C in Senai to 33.1°C in Temerloh and Kuantan. The highest temperature was 35.4°C, recorded in Sibu and Bintulu. Temperature in Cameron Highlands ranged from 15.1°C to 22.3°C with a mean of 17.7°C. 4. SOLAR RADIATION In general, the country received more solar radiation during this month. The mean daily solar radiation varied from 11.95 MJm-2 in Senai to 20.13 MJm-2 in Kota Bharu. The largest positive and negative deviations were recorded in Subang (+3.38 MJm-2) and Senai (-2.40 MJm-2) respectively. 5. EVAPORATION The country experienced higher rates of evaporation due to the increase of solar radiation. The mean daily evaporation rates in lowland areas varied from 2.9 mm/day in Kluang to 4.8 mm/day in Sandakan. The largest positive and negative deviations from average were +0.8 mm/day in Kuching and -0.6 mm/day in Pulau Langkawi. The rate of evaporation in Cameron Highlands was 2.2 mm/day with a deviation of +0.3 mm/day.
Figure
1 : Rainfall Map for Peninsular Malaysia
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