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  • The Weather of February 2017

  • 2 March 2017

    February 2017 was brighter than usual, with the duration of sunshine in the month more than 40 percent above normal. The month was also relatively mild with a mean temperature of 17.0 degrees, 0.2 degree above the normal of 16.8 degrees. The monthly total rainfall was 19.9 millimetres, less than half of the normal of 54.4 millimetres. The accumulated rainfall of 27.7 millimetres in the first two months of the year was about 65 percent below the normal of 78.9 millimetres for the same period.

    The month had a mild start with sunny periods on the first day. A freshening easterly airstream brought cloudier conditions and slightly cooler weather over the next couple of days. With the northeast monsoon moderating and humid maritime air moving in towards the coast of Guangdong, the weather was a mixture of sunshine, haze, mist and some rain patches on 4 and 5 February. Easterly winds strengthened on 6 February and once again brought cloudier and slightly cooler weather to Hong Kong over the next couple of days.

    With a cold front moving across the coastal areas of Guangdong on the night of 8 February, local winds strengthened from the north and temperatures fell significantly overnight. Under the influence of an intense winter monsoon following the passage of the cold front, the weather became cold and dry in the next three days. After a chilly morning on 11 February, the lingering clouds were finally cleared away and a spell of sunny weather lasted for more than a week till 18 February. With plenty of sunshine and the northeast monsoon subsiding, the weather became rather warm on 16 – 18 February as daytime temperatures climbed to the mid-twenties.

    Affected by a moist maritime airstream, the weather turned generally cloudy with a few rain patches and relatively low visibility on 19 February. Warm conditions returned the next day as the clouds thinned out and temperatures at the Hong Kong Observatory rose to a maximum of 25.5 degrees, the highest of the month. The maritime airstream also brought foggy weather to Hong Kong on the morning of 21 February with visibility at Waglan Island falling below 200 metres. With the setting in of a fresh to strong easterly airstream that day, the weather turned cooler and cloudy with rain patches, and a few thunderstorms also affected Hong Kong on the morning of 22 February.

    Following the passage of a cold front early on 23 February, an intense northeast monsoon brought overcast sky, light rain patches and cold mornings that persisted for the next three days. Temperatures at the Hong Kong Observatory fell to a minimum of 10.6 degrees on the morning of 26 February, the lowest of the month. Under the influence of a dry continental airstream, there were sunny periods with cool mornings towards the end 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 1.4.  Monthly meteorological figures and departures from normal for February are tabulated in Table 2.
 

Warnings and Signals issued in February 2017

Table 1.1   Strong Monsoon Signal
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
6 / 2 1615 7 / 2 1645
8 / 2 1945 9 / 2 1145
21 / 2 0945 22 / 2 0245


Table 1.2   Thunderstorm Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
22 / 2 0045 22 / 2 0415


Table 1.3   Fire Danger Warnings
Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Red 9 / 2 0745 12 / 2 0600
Yellow 12 / 2 0600 12 / 2 2300
Red 13 / 2 1130 13 / 2 1930
Red 14 / 2 0745 14 / 2 2245
Red 15 / 2 0745 15 / 2 2145
Yellow 18 / 2 0600 18 / 2 1800
Yellow 19 / 2 0600 19 / 2 1145
Yellow 26 / 2 1130 26 / 2 1800
Red 27 / 2 1300 27 / 2 2245


Table 1.4   Cold Weather Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
8 / 2 1620 12 / 2 1010
23 / 2 1620 27 / 2 0715


Table 2   Figures and Departures from Normal - February 2017
Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 20.0 degrees C 1.1 degrees above normal
Mean Air Temperature 17.0 degrees C 0.2 degree above normal
Mean Daily Minimum Air Temperature 14.9 degrees C 0.1 degree below normal
Mean Dew Point Temperature 12.2 degrees C 0.8 degree below normal
Mean Relative Humidity 75 % 5 % below normal
Mean Cloud Amount 65 % 9 % below normal
Total Rainfall 19.9 mm 34.5 mm below normal
Number of hours of Reduced VisibilityΔ 34 hours 102.2 hours below normal§
Total Bright Sunshine Duration 139.9 hours 45.7 hours above normal
Mean Daily Global Solar Radiation 13.31 Megajoule / square metre 3.92 Megajoule above normal
Total Evaporation 68.5 mm 8.6 mm above 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 1981 - 2010 climatological normal, except for number of hours of reduced visibility

  §   Departure from mean value between 1997 and 2016

daily values of selected meteorological elements for HK for February 2017

The percentile map of mean temperature of February 2017

  Remarks : Extremely high: above 95th percentile
Above normal: between 75th and 95th percentile
Normal: between 25th and 75th percentile
Below normal: between 5th and 25th percentile
Extremely low: below 5th percentile
Percentile and 5-day running average values are
computed based on the data from 1981 to 2010




Rainfall Map For February 2017 (isohyets are in millimetres)

Extract of Meteorological Observations in Hong Kong for February 2017