Agreement No. CE 45/2008 (CE) Liantang/Heung Yuen Wai Boundary Control Point and Associated Works 1st Quarterly Environmental Monitoring and Audit Summary Report –
Weather Condition Extracted from HKO
The weather of August 2013
The weather of August 2013 was rather gloomy, mainly due to a prolonged period of cloudy and rainy weather associated with tropical cyclones Utor and Trami in mid-August. The total duration of bright sunshine recorded in the month was 148.1 hours, the 10th lowest on record for the month of August and about 22 percent below the normal figure of 188.9 hours. The monthly total rainfall of 445.4 millimetres was slightly above the normal figure of 432.2 millimetres. The accumulated rainfall since 1 January was 2218.8 millimetres, about 16 percent above the normal figure of 1905.5 millimetres for the same period.
Due to the heavy rain episodes in the early part of the month and the rainfall associated with tropical cyclone Usagi in late September, it was wetter than usual in September 2013. The total rainfall of the month was
454.2 millimetres, about 39 percent above the normal figure of 327.6 millimetres. The accumulated rainfall since 1 January was 2673.0 millimetres, about 20 percent above the normal figure of 2233.1 millimetres for the same period. While the month was overall slightly cooler than normal, the approach of Usagi also brought very hot conditions and high temperatures on 20 and 21 September.
With the dominance of dry northeast monsoon for most of the time in the month, October 2013 was sunnier and drier than usual. The monthly total duration of bright sunshine was 247.3 hours, about 28 percent above the normal figure of 193.9 hours. The monthly mean relative humidity of 66 percent was the third lowest for October since 1961. Also, the monthly total rainfall was 2.9 millimetres, only about 3 percent of the normal figure of 100.9 millimetres. However, the accumulated rainfall since 1 January of 2675.9 millimetres was still about 15 percent above the normal figure of 2334.0 millimetres for the same period. The month was also slightly warmer than usual. The monthly mean temperature of 25.7 degrees was 0.2 degrees above the normal figure of 25.5 degrees.
Remark: The meteorological data during the Reporting Period is presented in the relevant monthly EM&A report.
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