Skip to main content
Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
red dot
Print Version
Back
Print Version PDF Version

The Weather of June 2012

     June 2012 was drier than usual, especially in the first half of the month.  This was mainly attributed to the predominance of the ridge of high pressure and the lack of active trough of low pressure over the south China coastal areas during the early part of the month.  The total rainfall of the month was 261.5 millimetres, about 43 percent below the normal figure of 456.1 millimetres.  The accumulated rainfall since 1 January was 927.8 millimetres, a deficit of 15 percent comparing to the normal figure of 1096.8 millimetres for the same period.  The month was also slightly warmer than usual with the mean temperature of 28.1 degrees, 0.2 degrees above the normal figure of 27.9 degrees.

     Under the influence of a ridge of high pressure, the weather in Hong Kong was generally fine apart from a few showers for the first four days in the month.  It remained fine and hot with moderate easterly winds from 5 to 7 June.  As winds turned southerly, it became very hot apart from a few showers on 8 June.  

     With the establishment of the fresh to strong southwest monsoon, the weather gradually became cloudy with showers and a few squally thunderstorms for the next three days.  Meanwhile, a trough of low pressure over inland Guangdong moved southwards and lingered over the coast on 12 and 13 June, bringing a few thundery showers to the territory on these two days.  With the trough of low pressure moving into the northern part of the South China Sea, local weather improved and there were sunny periods on 14 and 15 June.  

     The trough of low pressure deepened over the northern part of the South China Sea and brought more than 50 millimetres of rainfall over most parts of the territory on 16 June.  An area of low pressure developed over the sea to the east of Hainan Island and intensified into a tropical depression on 17 June.  While moving eastwards across the northern part of the South China Sea, it further intensified into a tropical storm, named Talim, in the next morning and finally became a severe tropical storm that night.  Affected by the passage of Talim to the south, there were some squally showers and occasional strong winds offshore and on high ground in Hong Kong on 17 and 18 June. 
 
     With Talim gradually moving away, local weather improved with sunny periods on 19 June.  The sun rays in concert with the departing rain clouds also gave rise to a prominent double rainbow over Hong Kong later in that afternoon.  While Talim continued to track northeast towards the Taiwan Strait, local winds turned northerly on 20 June.  The northerly continental airstream brought very hot weather to Hong Kong on that day.  Affected by the active southwest monsoon, local weather turned cloudy with showers and a few squally thunderstorms on the next two days.  As the moisture associated the active southwest monsoon moved inland, there were sunny intervals and a few showers from 23 to 26 June.  Affected by a ridge of high pressure extending westwards from the Pacific, the weather became generally fine and hot on 27 and 28 June.  

     Meanwhile, Tropical Storm Doksuri over the seas east of the Philippines moved across the Luzon Strait on 28 June and edged towards the coast of Guangdong the next day.  Under the influence of the subsidence air ahead of Doksuri, it was very hot on 29 June.  The temperature recorded at the Observatory soared to a maximum of 33.3 degrees in that afternoon, the highest of the month.  As Doksuri came close to the Pearl River Estuary, local winds strengthened with squally showers that evening.   Gale force winds were recorded in some parts of Hong Kong at night on 29 June and on the early morning of 30 June.  

     Doksuri made landfall to the west of the Pearl River Estuary and weakened over the inland area of western Guangdong on the morning of 30 June.  Locally, winds subsided gradually but, due to the remnant rainbands of Doksuri on that day, there were still scattered showers and a few squally thunderstorms in Hong Kong.

A double rainbow appeared over Hong Kong in the afternoon on 19 June 2012
A double rainbow appeared over Hong Kong in the afternoon on 19 June 2012

    Four tropical cyclones occurred over the western North Pacific and the South China Sea in the month.

    Details of issuance and cancellation of various warnings/signals in the month are summarized in Tables 1.1 to 1.6.  Monthly meteorological figures and departures from normal for June are tabulated in Table 2.

Warnings and Signals issued in June 2012

Table 1.1   Tropical Cyclone Warning Signals
Name of
Tropical Cyclone
Signal
Number
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
TALIM 1 17 / 6 1620 18 / 6 2240
3 18 / 6 2240 19 / 6 1020
1 19 / 6 1020 19 / 6 2040
DOKSURI 1 28 / 6 2140 29 / 6 1620
3 29 / 6 1620 29 / 6 2305
8 NE 29 / 6 2305 30 / 6 0040
8 SE 30 / 6 0040 30 / 6 0325
3 30 / 6 0325 30 / 6 0640
1 30 / 6 0640 30 / 6 0815


Table 1.2   Strong Monsoon Signal
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
31 / 5 2120 1 / 6 0940
11 / 6 1245 11 / 6 1720
22 / 6 1240 22 / 6 2115
25 / 6 1120 25 / 6 1615


Table 1.3   Rainstorm Warning Signals
Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Amber 13 / 6 1515 13 / 6 1640


Table 1.4   Thunderstorm Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
2 / 6 1915 2 / 6 2030
9 / 6 0345 9 / 6 0515
9 / 6 1000 9 / 6 1130
10 / 6 0540 10 / 6 1215
11 / 6 1430 11 / 6 1630
11 / 6 1745 11 / 6 1845
12 / 6 0330 12 / 6 0530
12 / 6 1745 13 / 6 0020
13 / 6 0345 13 / 6 0545
13 / 6 1430 13 / 6 1730
16 / 6 0915 16 / 6 1015
16 / 6 1145 16 / 6 1445
21 / 6 0040 21 / 6 0545
21 / 6 0750 21 / 6 1000
21 / 6 1040 21 / 6 2100
21 / 6 2330 22 / 6 0930
22 / 6 1305 22 / 6 1430
22 / 6 2210 22 / 6 2330
23 / 6 2115 23 / 6 2315
29 / 6 1535 29 / 6 1745
30 / 6 0350 30 / 6 0845


Table 1.5   Very Hot Weather Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
8 / 6 1235 9 / 6 1620
20 / 6 0845 20 / 6 2300
28 / 6 1000 29 / 6 1745


Table 1.6   Special Announcement on Flooding
in the Northern New Territories
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
12 / 6 2030 12 / 6 2245


Table 2   Figures and Departures from Normal - June 2012
Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 30.5 degrees C 0.3 degree above normal
Mean Air Temperature 28.1 degrees C 0.2 degree above normal
Mean Daily Minimum Air Temperature 26.4 degrees C 0.2 degree above normal
Mean Dew Point Temperature 25.0 degrees C 0.4 degree above normal
Mean Relative Humidity 83 % 1 % above normal
Mean Cloud Amount 78 % 1 % above normal
Total Rainfall 261.5 mm 194.6 mm below normal
Number of hours of Reduced VisibilityΔ 27 hours 6.7 hours above normal§
Total Bright Sunshine Duration 126.0 hours 20.1 hours below normal
Mean Daily Global Solar Radiation 14.10 Megajoule / square metre 0.09 Megajoule below normal
Total Evaporation 113.5 mm 3.6 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 1981 - 2010 climatological normal, except for number of hours of reduced visibility

  §   Departure from mean value between 1997 and 2011

daily values of selected meteorological elements for HK for June 2012


Rainfall Map For June 2012 (isohyets are in millimetres)

 
Last revision date: <31 Dec 2012>