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MOnthly weather bulletin SEPTEMBER 2008 1. SUMMARY Generally, most places in the country received average to above average rainfall amount during this month. The temperature and evaporation rates were recorded above average while the amount of solar radiation were recorded below average for most places in the country. 2. RAINFALL Climatologically, September correspond to the end of southwest monsoon. In general, most places were wet and received normal to much above normal rainfall. Spatially, northern regions received more rainfall in Peninsular Malaysia. Over East Malaysia, central Sarawak and western Sabah received more rainfall than the rest. Temporally, more rainfall was distributed during the first half of the month. It was noted that Bintulu had recorded it highest monthly rainfall for the month of September this year of 549.6mm while Muadzam Shah recorded the lowest monthly rainfall of 52.6mm. Bayan Lepas had recorded it highest daily rainfall for the month of 160.8mm on 29th September . The number of rain days varied from 10 days in Kudat to 20 days in Bayan Lepas and Chuping. 3. TEMPERATURE Generally, the country recorded above normal temperature. The monthly mean temperature of lowland areas varied from 26.0°C as recorded at Muadzam Shah to 27.6°C as recorded at Melaka. The largest positive deviation from normal was 0.9°C as recorded at Melaka and the largest negative deviation was -0.8°C as recorded at Kuala Terengganu. The monthly mean minimum temperature of lowland areas ranged from 22.7°C at Kuala Krai to 24.6°C at Labuan. The lowest temperature of 20.6°C was recorded at Bintulu. The monthly mean maximum temperatures of lowland areas ranged from 30.3°C at Pulau Langkawi to 33.4°C at Kuantan. The highest temperature of 35.8°C was recorded at Sri Aman. Cameron Highlands, the highland station, recorded temperature had ranged between 13.6°C and 24.4°C, with the mean value of 17.4°C.4. SOLAR RADIATION During this month, most of the places in the country received below normal amount of solar radiation. The mean solar radiation varied from 13.70MJm-2 in Senai to 18.81MJm-2 in Kuantan. The largest positive and negative deviations were recorded at +2.71MJm-2 in Subang and at -2.26MJm-2 in Kuala Krai. Cameron Highlands recorded the amount of mean daily solar radiation at 10.56MJm-2 with the deviation of -2.88MJm-2 5 . EVAPORATION The evaporation rate over the country was above normal. The mean daily evaporation rates at the lowland areas varied from 3.0mm/day as recorded at Kuala Krai to 5.0mm/day at Sandakan. Meanwhile, the largest positive deviation was +0.8mm/day at Kluang and the negative deviation was -0.6mm/day at Miri. The mean daily evaporation rate at Cameron Highlands was 2.6mm/day, with the deviation of 0.8mm/day.
Figures :
Figure
1 : Rainfall Map for Peninsular Malaysia
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