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MOnthly weather bulletin MAY 2008 1. SUMMARY Generally, most parts of the country received normal to much below normal rainfall. The temperature recorded was below than normal temperature. The country recorded slightly below normal amount of solar radiation and experienced lower rate of evaporation. 2. RAINFALL The month of May marks the end of the Inter Monsoon and the beginning of the Southwest Monsoon. Most of the central and northwestern regions of Peninsular Malaysia were dry and received below average to average rainfall amount. Most of the relatively drier areas had experienced periods of dry spells. The number of rain days for Peninsular Malaysia varied from 9 to 21 days whereas for East Coast Malaysia varied from 11 to 16 days. As for total monthly rainfall, Alor Setar recorded the highest total rainfall of 267.0 mm whereas Kluang recorded the lowest total rainfall of 51.2 mm. Over East Malaysia, Kuching recorded the highest total rainfall at 346.8 mm while Miri recorded the lowest total rainfall at 103.0 mm in Sarawak. In Sabah, Tawau recorded the highest total rainfall at 301.4 mm whereas Sandakan recorded the lowest total rainfall at 115.0 mm. For total daily rainfall, Alor Setar Station recorded the highest amount of 117.4 mm in Peninsular Malaysia on the 28th. In Sarawak, the highest amount was 102.6 mm, recorded in Bintulu on the 27th. In Sabah, the highest amount was 74.2 mm, recorded in Kudat on the 26th. Based on the classification scheme, there were 3 stations recorded much above average rainfall, 2 stations recorded above average, 15 stations recorded average rainfall, 7 stations recorded below average and 6 stations recorded much below average. 3. TEMPERATURE The mean temperature of the month over lowland areas varied from 26.2°C at Kuala Terengganu to 28.4°C at Petaling Jaya respectively. The largest positive deviation from normal was +0.7°C recorded at Malacca and the largest negative deviation was -1.7°C at Kuala Terengganu. The monthly mean minimum temperature over lowland areas ranged from 23.1°C at Senai and Sri Aman to 25.1°C at Bayan Lepas and Petaling Jaya. The lowest temperature of the month was 21.0°C recorded at Kuala Terengganu. The monthly mean maximum temperatures over lowland areas ranged from 30.3°C at Kuala Terengganu to 33.8°C at Muadzam Shah. The highest temperature was 36.4 ºC recorded at Kluang. Cameron Highlands, the only highland station, recorded temperature ranged between 14.5°C and 25.8°C. The mean temperature value of 18.1°C with deviation from normal was -0.7°C.4. SOLAR RADIATION The mean daily solar radiation varied from 12.54MJm-2 as recorded at Senai to 19.77MJm-2 at Kota Bharu. The largest positive deviation was recorded as +2.90MJm-2 at Miri and the negative deviation was recorded as -2.44MJm-2 at Senai. Cameron Highland recorded a mean daily solar radiation of 13.64MJm-2 with the deviation of -0.80MJm-2.5 . EVAPORATION Overall, the evaporation rate over the country was slightly below normal. The mean daily evaporation rates at the lowland areas varied from 2.9mm/day as recorded at Kluang to 5.1mm/day at Kudat and Kota Kinabalu. The largest positive deviation was +0.6mm/day at Sibu and the negative deviation was -1.2mm/day at Kuala Terengganu (Climat). The mean daily evaporation rate at Cameron Highlands was 2.2mm/day, with the deviation of +0.2mm/day.
Figures and tables:
Figure
1 : Rainfall Map for Peninsular Malaysia
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