=======+===========+===========+===========+=====+==============+===== Month | Mean | Mean | Mean |Rela-| Rainfall | Num- |Temperature| Maximum | Minimum | tive| | ber | |Temperature|Temperature| Hu- | | of +----+------+----+------+----+------+midi-+-----+--------+Rainy | F. | ~C.~ | F. | ~C.~ | F. | ~C.~ | ty | Ins.| ~Mm.~ | Days -------+----+------+----+------+----+------+-----+-----+--------+----- January|76·1|~24·5~|87·7|~30·9~|69·4|~20·7~| 75 | 0·09| ~2·4~| 2 Februa-| | | | | | | | | | ry |79·1|~26·2~|88·6|~31·5~|74·1|~23·4~| 78 | 0·56| ~14·2~| 7 March |82·5|~28·1~|93·0|~33·9~|74·5|~23·6~| 74 | 0·83| ~21·4~| 1 April |83·4|~28·5~|94·1|~34·5~|79·0|~26·1~| 75 | 2·42| ~51·1~| 10 May |82·3|~27·9~|89·7|~32·0~|76·8|~24·8~| 78 |10·54| ~268·0~| 20 June |82·3|~27·9~|89·4|~31·8~|78·1|~25·7~| 78 | 7·72| ~195·7~| 16 July |81·4|~27·4~|88·1|~31·2~|76·2|~24·5~| 78 | 8·02| ~204·0~| 26 August |81·4|~27·4~|89·0|~31·7~|76·2|~24·5~| 79 | 5·65| ~143·5~| 17 Septem-| | | | | | | | | | ber |80·3|~26·8~|88·6|~31·5~|76·7|~24·8~| 82 |11·30| ~287·0~| 22 October|80·1|~26·7~|87·3|~30·7~|75·1|~24·0~| 82 | 7·46| ~189·3~| 14 Novem- | | | | | | | | | | ber |76·8|~24·9~|83·7|~28·8~|70·3|~21·3~| 77 | 2·36| ~59·8~| 6 Decem- | | | | | | | | | | ber |74·8|~23·8~|81·6|~27·6~|63·3|~17·4~| 74 | 0·09| ~2·4~| 2 -------+----+------+----+------+----+------+-----+-----+--------+----- Year |80·1|~26·6~|88·4|~31·3~|74·1|~23·4~| 77 |67·04|~1703~ | 143 =======+====+======+====+======+====+======+=====+=====+========+===== Some authorities make the rainfall of Bangkok considerably less, but Campbell’s observations extended over several years and may perhaps be preferred. The delta of the Menam River is annually flooded between June and November, and the spring levels are close to the surface all the year round. North of the delta of the Menam is the Korat Plateau, some 700 feet above the sea-level, a wilderness of shadeless bush, interspersed with salt marshes. One of the main drawbacks of the country is the scarcity of potable water, the supplies both in the Menam delta and on the Korat being almost always brackish and a nearly certain cause of digestive disturbance for Europeans, who thus have to rely greatly on aerated waters imported from the Straits. Upper Siam, on the other hand, enjoys a dry climate with cool nights, but speaking generally the climate is an exceptionally trying one for European residents.