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V, 4*2*4*3(!fevember f 1983)4*2®4®3 Temperature differenceBecause the Bong Kong climate varies from theBritish climate t temperature differences have been thoughtto vary similarly y and in oilier to quantify the variations fa temperature measuring system has "been installed at TexacoBoad Hyover in Tsuen Wan* Alt hough sufficient resultsare not yet available for proper analysis, preliminaryindications are that f contrary to expectations! the recommendationsof clause 5*4»5 of BS 5400 i Part 2 are broadly applicable to EbngKbng f ajnd they should accordingly be used* ELgtxre 4«2»1 shows theranges of temperature difference experienced at Texaco Jtead in aspell of warm weather and a spell of cool weather 9 and illustrateshow the results correspond cjuite closely with the recommendationsof Hgure 9 of BS 5400 s Part 2 for Group 4 superstructures.4*2®4®4 Surface temperaturesDuring the period from February 1979 "to Januarythe Boyal Observatory recorded the surface temperatures of aplain concrete slab and an asphalt-surfaced slab t togetherwith the corresponding values of air temperature and globalsolar radiation* The monthly mean values recorded then aregiven in Table 4®2«6 t together with the extreme values*