The kingdom of . 93° 68° December 81°.2 95° 69° 40 Kingdom of Siam The records of the rainfall also are scanty in Siamand with many breaks. From the existing recordsare derived the following figures, concerning theaverage monthly rainfall in Bangkok during the tenyears period, 1882-1891 : Average Rainfall in Bangkok January cm. For nine years only;consequently the an- February 3-76 cm March cm April , cm. V- nual average does not May cm. I agree with the sum of June cm. J the monthly averages. July cm. August 17-93 cm. September cm. October c
The kingdom of . 93° 68° December 81°.2 95° 69° 40 Kingdom of Siam The records of the rainfall also are scanty in Siamand with many breaks. From the existing recordsare derived the following figures, concerning theaverage monthly rainfall in Bangkok during the tenyears period, 1882-1891 : Average Rainfall in Bangkok January cm. For nine years only;consequently the an- February 3-76 cm March cm April , cm. V- nual average does not May cm. I agree with the sum of June cm. J the monthly averages. July cm. August 17-93 cm. September cm. October cm. November cm. December cm. Annual cm. The maximum annual rainfall recorded in Bang-kok is cm. in 1849; ^^^ minimum cm. in1884. During the last four years, in a great number ofplaces all over the country, regular rainfall observa-tions have been recorded. The average of all theserecords for the lower Menam plain is year. It is a matter of interest that, according to the. < 72 O o < O A General Description of Siam 41 results of these records, the amount of rain is muchsmaller in Lower Siam than in the upper Menambasin and than in the hill region between the Menamand the Mekong basins. Comparison of the figuresfor the average rainfall in the northern provinces ofSiam ( cm.) and in the eastern hill range(Muaklek cm. and Hinlap cm.) withthe figures for Lower Siam () show this factclearly. In the Malay Peninsula (average cm.) andin the southeastern provinces of the kingdom (aver-age cm.) the rainfall also appears to be muchgreater than in Lower Siam. These facts are well known by long experience,and, indeed, they can be explained very rationallyby the function of the high western hill ranges thatretain the humidity of the southwest monsoon;thus we find that the rainfall in Lower Burmah ismore than one hundred inches, that is, about twiceas great as in Lower Siam. The influence of thesehil
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