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MOnthly weather bulletin DECEMBER 2007 1. SUMMARY The Northeast Monsoon that started in November had its peak in December. Most places in the country were wet and received average to much above average amount of rainfall. The recorded temperature, solar radiation and evaporation were recorded average for most places in the whole country. 2. RAINFALL Climatologically, December was usually wet as compared to the other month. Most parts of the country received average to much above average amount of rainfall, however in Kota Bharu, Labuan and Kota Kinabalu received below average rainfall amount.
Temporally, more rain was distributed during the first two decade of the month for Peninsular Malaysia, whereas over East Malaysia, the rain was evenly distributed. Spatially, more rainfall were received over eastern of Peninsular Malaysia. Over East Malaysia, western Sarawak and northern Sabah received more rainfall than the other places. Cold surge from Asian continent coupled with high moistures content of easterly wind from Western Pacific had caused heavy precipitations over Johor, Melaka, Negeri Sembilan, Selangor, Pahang, Kelantan and Terengganu. It was noted that Kuala Krai, Muadzam Shah and Temerloh had recorded it highest monthly rainfall on record for the month of December of 1111.2mm, 1095.4mm and 441.4mm of rainfall amount respectively. Muadzam Shah, Sandakan and Kuching had recorded it highest daily rainfall on record for the month of December of 342.3mm on 10th, 103.4mm on 21st and 139.0mm on 31st December respectively. The number of rain days varied from 11 days in Pulau Langkawi to 29 days in Kudat. Kuala Krai recorded the highest monthly rainfall of 1111.2mm while Pulau Langkawi recorded the lowest monthly rainfall of 54.0mm.3. TEMPERATURE Generally, the country recorded normal temperature. The monthly mean temperature of lowland areas varied from 24.7°C as recorded at Kuala Krai to 27.7°C as recorded at Pulau Langkawi. The largest positive deviation from normal was 0.8°C as recorded at Butterworth and the largest negative deviation was -0.8°C as recorded at Kota Bharu. The monthly mean minimum temperature of lowland areas ranged from 22.2°C at kuala Krai to 25.4°C at Labuan. The lowest temperature of 18.5°C was recorded at Kuala Krai. The monthly mean maximum temperatures of lowland areas ranged from 28.8°C at Kuala Terengganu(Climat) to 31.9°C at Ipoh. The highest temperature of 34.7°C was recorded at Ipoh. Cameron Highlands, the highland station, recorded temperature had ranged between 10.9°C and 23.3°C, with the mean value of 17.3°C.4. SOLAR RADIATION During this December, most places in the country received normal solar radiation. The mean daily solar radiation varied from 11.51MJm-2 recorded at Senai to 16.54MJm-2 at Bayan Lepas. The largest positive and negative deviations from the mean were recorded at 3.32MJm-2 and –2.54MJm-2 in Kota Bharu and Senai respectively. Cameron Highland recorded the mean daily solar radiation at 12.84MJm-2 with the deviation of 0.37MJm-2.
5 . EVAPORATION Overall, the evaporation rate over the country was normal. The mean daily evaporation rates in lowland areas varied from 2.2 mm/day in Kuala Terengganu(Climat) to 4.4 mm/day in Sandakan. The largest positive deviation was +0.7mm/day at Kuantan and Sandakan and the largest negative deviation was -1.1mm/day at Pulau Langkawi. The rate in Cameron Highlands was 1.6mm/day with a deviation of +0.0mm/day.
Figures and tables:
Figure
1 : Rainfall Map for Peninsular Malaysia
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