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The Weather of June 2014

    With the monthly mean temperature reaching 29.0 degrees, June 2014 was the hottest June in Hong Kong since records began in 1884.  The monthly mean minimum temperature of 27.0 degrees and maximum temperature of 31.5 degrees were respectively one of the second and the third highest for June.  Such high temperatures were attained despite the facts that sunshine duration and rainfall for the month were not far from normal.  The total rainfall of the month was 436.6 millimetres, about 4 percent below the normal figures of 456.1 millimetres.  The accumulated rainfall since 1 January of 1503.4 millimetres was about 37 percent above the normal figure of 1096.9 millimetres for the same period.

    Under the dominance of an anticyclone aloft, the weather in Hong Kong was mainly fine and very hot for the first two days of the month.  Affected by a trough of low pressure, it turned cloudy with some showers and isolated thunderstorms on 3 June.  With the trough of low pressure pushed back towards the mainland areas of Guangdong, fine and hot weather returned on 4 June apart from a few morning showers.  However, the lingering presence of the trough continued to bring a mixture of sunshine and thundery showers to the territory in the next four days.

    With the setting in of a fresh easterly airstream on 9 June, showers and thunderstorms gradually eased off and there were sunny intervals during the days on 10 and 11 June.  Under the influence of a dry continental airstream, local weather remained mostly fine and dry for the ensuing three days.

    While Hong Kong experienced a very hot day on 14 June, a tropical depression formed over the northeastern part of the South China Sea and intensified into a tropical storm named Hagibis.  Tracking generally northwards, Hagibis made landfall near Shantou in the afternoon on 15 June and weakened into a tropical depression that night.  Affected by the rainbands of Hagibis, local weather was cloudy with some showers on 15 June. 

    A southwest monsoon then maintained generally hot weather with sunny periods and thundery showers over the next five days.  As another trough of low pressure lingered along the south China coast, the weather in Hong Kong became even more unsettled with occasional heavy showers and squally thunderstorms from 21 to 25 June.  The showers were particularly heavy on the morning of 22 June.  Rainfall exceeded 70 millimetres over widespread areas and more than 150 millimetres were recorded at Lamma Island, Cheung Chau, the eastern part of Lantau Island and the western part of Hong Kong Island.

    With an anticyclone aloft establishing over southern China, sunny and very hot weather returned from 26 to 28 June.  Temperatures recorded at the Hong Kong Observatory rose to a maximum of 33.7 degrees on 27 June, the highest of the month.   Affected by a broad trough of low pressure over the coast of Guangdong and the northern part of the South China Sea, there were sunny periods with a few showers and isolated thunderstorms on the last two days of the month.


    Two tropical cyclones occurred 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 1.5.  Monthly meteorological figures and departures from normal for June are tabulated in Table 2.


 

Warnings and Signals issued in June 2014

Table 1.1   Tropical Cyclone Warning Signals
Name of
Tropical Cyclone
Signal
Number
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
HAGIBIS 1 14 / 6 1740 15 / 6 1320


Table 1.2   Rainstorm Warning Signals
Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Amber 8 / 6 2135 8 / 6 2200
Red 8 / 6 2200 8 / 6 2310
Amber 8 / 6 2310 8 / 6 2345
Amber 21 / 6 0830 21 / 6 1050
Amber 22 / 6 0120 22 / 6 0205
Red 22 / 6 0205 22 / 6 0505
Amber 22 / 6 0505 22 / 6 0625


Table 1.3   Thunderstorm Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
3 / 6 1744 3 / 6 1845
5 / 6 0842 5 / 6 0945
5 / 6 1115 5 / 6 1640
6 / 6 0600 6 / 6 0830
6 / 6 0925 6 / 6 1430
7 / 6 1255 7 / 6 1400
8 / 6 1344 8 / 6 1515
8 / 6 1946 9 / 6 0345
16 / 6 0245 16 / 6 0600
17 / 6 0715 17 / 6 1015
17 / 6 1135 17 / 6 1345
18 / 6 0310 18 / 6 0845
19 / 6 0238 19 / 6 0845
19 / 6 0910 19 / 6 1130
20 / 6 0215 20 / 6 0515
20 / 6 0550 20 / 6 1430
20 / 6 1505 20 / 6 1615
20 / 6 1800 20 / 6 1900
20 / 6 2220 21 / 6 1200
21 / 6 1925 21 / 6 2230
21 / 6 2310 22 / 6 1000
23 / 6 0440 23 / 6 0800
23 / 6 0845 23 / 6 1200
23 / 6 2140 24 / 6 0300
24 / 6 0400 24 / 6 0730
24 / 6 0900 24 / 6 1430
25 / 6 0350 25 / 6 1530
25 / 6 1555 25 / 6 1700
29 / 6 2139 29 / 6 2315
30 / 6 1145 30 / 6 1630


Table 1.4   Fire Danger Warnings
Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Red 13 / 6 1145 13 / 6 2035


Table 1.5   Very Hot Weather Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
30 / 5 0645 2 / 6 1900
4 / 6 1015 4 / 6 1845
5 / 6 1020 5 / 6 1345
14 / 6 1220 14 / 6 1745
18 / 6 1300 18 / 6 1800
26 / 6 1330 28 / 6 1825


Table 2   Figures and Departures from Normal - June 2014
Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 31.5 degrees C 1.3 degrees above normal
Mean Air Temperature 29.0 degrees C 1.1 degrees above normal
Mean Daily Minimum Air Temperature 27.0 degrees C 0.8 degree above normal
Mean Dew Point Temperature 25.0 degrees C 0.4 degree above normal
Mean Relative Humidity 80 % 2 % below normal
Mean Cloud Amount 77 % normal
Total Rainfall 436.6 mm 19.5 mm below normal
Number of hours of Reduced VisibilityΔ 17 hours 2.6 hours below normal§
Total Bright Sunshine Duration 147.3 hours 1.2 hours above normal
Mean Daily Global Solar Radiation 15.78 Megajoule / square metre 1.59 Megajoule above normal
Total Evaporation 127.7 mm^ 10.6 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 2013

  ^  Total for 28 days

daily values of selected meteorological elements for HK for June 2014

The percentile map of mean temperature of June 2014

  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




Last revision date: <23 Mar 2015>