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The Weather of November 2010

     With prevalence of relatively weak but dry northeast monsoon, there was ample of sunshine in November 2010.  The total bright sunshine duration for the month was 212.5 hours, about 19 percent above normal.  The mean temperature of the month was 21.2 degrees, slightly lower than the normal figure of 21.4 degrees.

     There were only a few days with rain in the month with total rainfall of 42.2 millimetres which is slightly higher than normal.  The accumulated rainfall since 1 January was 2353.3 millimetres, close to the normal figure of 2348.2 millimetres for the same period.

     A dry northeast monsoon over southern China brought fine and dry weather to Hong Kong for the first three days of the month.  Affected by a broad cloud band over the coastal areas of Guangdong, the weather became rainy and cooler from 4 to 6 November.  The minimum temperature recorded at the Hong Kong Observatory on 5 November was 16.8 degrees, the lowest of the month.  With the dissipation of the cloud band, fine weather resumed locally with some haze on 7 November.  It remained fine and dry from 8 to 12 November. 

     Another broad cloud band associated with an area of low pressure over the central part of the South China Sea brought cloudy periods to the territory for the ensuing three days.  A replenishment of the northeast monsoon reached the south China coast on the morning of 16 November, bringing cooler condition with a few light rain patches to Hong Kong upon arrival.  The clouds soon dissipated and there were some sunny periods and haze in that afternoon.  

     Dominated by the northeast monsoon, local weather was mainly fine apart from some haze from 17 to 24 November.  Another replenishment of the northeast monsoon reached the south China coastal areas on the morning of 25 November, bringing cooler and dry weather to Hong Kong from 25 to 27 November.  It remained fine with some haze for the last three days of the month.

     There was no tropical cyclone over the South China Sea and the western North Pacific in the month. 

     Details of issuance and cancellation of various warnings/signals in the month are summarized in Tables 1.1 to 1.2.  Monthly meteorological figures and departures from normal for November are tabulated in Table 2.

Warnings and Signals issued in November 2010


Table 1.1   Strong Monsoon Signal

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
12 / 11 2015 13 / 11 0600


Table 1.2   Fire Danger Warnings

Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Red 27 / 10 0600 1 / 11 0915
Red 3 / 11 0630 3 / 11 1800
Yellow 7 / 11 1145 7 / 11 2045
Red 8 / 11 0930 9 / 11 1945
Red 11 / 11 1130 11 / 11 1945
Red 12 / 11 1130 12 / 11 1800
Yellow 13 / 11 0630 13 / 11 1800
Yellow 14 / 11 0600 14 / 11 1800
Yellow 20 / 11 0600 20 / 11 1800
Yellow 21 / 11 0600 21 / 11 1800
Red 25 / 11 0630 26 / 11 1800
Yellow 27 / 11 1130 27 / 11 1800
Yellow 28 / 11 0630 28 / 11 2000


Table 2   Figures and Departures from Normal - November 2010

Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 23.9 degrees C 0.1 degree below normal
Mean Air Temperature 21.2 degrees C 0.2 degree below normal
Mean Daily Minimum Air Temperature 19.2 degrees C 0.2 degree below normal
Mean Dew Point Temperature 16.1 degrees C 0.8 degree above normal
Mean Relative Humidity 74 % 4 % above normal
Mean Cloud Amount 51 % 2 % below normal
Total Rainfall 42.2 mm 7.1 mm above normal
Number of hours of Reduced VisibilityΔ 216 hours 63.9 hours above normal§
Total Bright Sunshine Duration 212.5 hours 34.3 hours above normal
Mean Daily Global Solar Radiation 13.70 Megajoule / square metre 1.06 Megajoule above normal
Total Evaporation 94.6 mm 17.9 mm below normal


  Remarks : All measurements were made at the Hong Kong Observatory except sunshine, solar radiation and evaporation which were recorded at King's Park Meteorological Station and visibility which was observed at the Hong Kong International Airport.
  Δ

The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.
Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10-minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.


  *   Departure from 1971 - 2000 climatological normal, except for number of hours of reduced visibility

  §   Departure from mean value between 1997 and 2009

daily values of selected meteorological elements for HK for November 2010

Extract of Meteorological Observations in Hong Kong for November 2010