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The Weather of June 2007

    June 2007 was warmer than usual. The mean temperature of 28.4 degrees was 0.6 degree above normal. It was also slightly wetter with a monthly rainfall amount of 490.1 millimetres, about 30 percent above normal. The accumulated rainfall since the beginning of the year was 968 millimetres, about 2 percent below normal for the same period.

    Under the influence of a southwesterly airstream, it was mainly fine and hot apart from a few showers on the first five days of the month.

    A trough of low pressure over southern China moved towards the coast on 13 June and marked the start of an episode of unsettled weather for the next nine days. Severe gusts with speed reaching 129 kilometres per hour were recorded at the Hong Kong International Airport on the morning of 8 June when squally thunderstorms affected the territory. A helicopter of the Government Flying Service that parked on the apron was toppled in the gusty winds. On 10 June, a squall line swept across Hong Kong from northwest to southeast in the early morning, bringing severe gusts and heavy showers. Peak gusts over 120 kilometres per hour were recorded at Tai O. Heavy rain during the day brought over 100 millimetres of rainfall to most parts of the territory. There were seven reports of flooding and about 100 reports of fallen trees.

    Showers subsided gradually on 16 and 17 June when the trough of low pressure dissipated. A ridge of high pressure established over the southern China on 18 June. Apart from a few showers, it was fine and hot in the ensuing eight days. With abundant sunshine, the maximum temperature rose to 33.5 degrees on 22 and again on 213 June, the highest in the month.

    The weather became rainy with thunderstorms on 27 and 28 June when Hong Kong came under the influence of an active southerly airstream. A trough of low pressure developed over the south China coastal areas and brought scattered showers to the territory on the last two 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 1.5.  Monthly meteorological figures and departures from normal for June are tabulated in Table 2.


 

Warnings and Signals issued in June 2007


Table 1.1   Strong Monsoon Signal

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
10 / 6 1350 10 / 6 1550


Table 1.2   Rainstorm Warning Signals

Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Amber 10 / 6 0245 10 / 6 0325
Red 10 / 6 0325 10 / 6 0455
Amber 10 / 6 0455 10 / 6 0830
Amber 28 / 6 0900 28 / 6 1030
Amber 29 / 6 0540 29 / 6 0625


Table 1.3   Thunderstorm Warning

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
1 / 6 0105 1 / 6 0445
1 / 6 0730 1 / 6 0830
2 / 6 0136 2 / 6 0545
2 / 6 0710 2 / 6 0815
2 / 6 1340 2 / 6 1545
4 / 6 0940 4 / 6 1145
5 / 6 0840 5 / 6 0945
6 / 6 0940 6 / 6 1145
6 / 6 1500 6 / 6 1600
6 / 6 1640 6 / 6 1715
6 / 6 2320 7 / 6 1500
8 / 6 0745 8 / 6 1215
8 / 6 1500 8 / 6 1700
9 / 6 1500 9 / 6 1800
10 / 6 0150 10 / 6 1600
11 / 6 1320 11 / 6 1730
12 / 6 1135 12 / 6 1600
12 / 6 1930 12 / 6 2130
13 / 6 0200 13 / 6 0600
13 / 6 1020 13 / 6 1330
13 / 6 1900 13 / 6 2200
14 / 6 0300 14 / 6 0515
14 / 6 0630 14 / 6 0830
14 / 6 1230 14 / 6 1330
14 / 6 1745 14 / 6 1945
17 / 6 0445 17 / 6 0745
17 / 6 0830 17 / 6 1130
19 / 6 1230 19 / 6 1330
20 / 6 1245 20 / 6 1500
21 / 6 1235 21 / 6 1415
22 / 6 1605 22 / 6 1745
24 / 6 1015 24 / 6 1300
25 / 6 0725 25 / 6 1330
26 / 6 1110 26 / 6 1500
26 / 6 1800 26 / 6 2000
26 / 6 2030 26 / 6 2230
27 / 6 0315 27 / 6 1415
27 / 6 2120 28 / 6 1430
29 / 6 0315 29 / 6 0715
29 / 6 1025 29 / 6 1525
29 / 6 1930 29 / 6 2130
30 / 6 0030 30 / 6 0745
30 / 6 1030 30 / 6 1200
30 / 6 1235 30 / 6 1545
30 / 6 2030 30 / 6 2200
30 / 6 2250 1 / 7 0030


Table 1.4   Very Hot Weather Warning

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
1 / 6 1435 2 / 6 1630
3 / 6 0745 3 / 6 1620
21 / 6 0955 21 / 6 1345


Table 1.5   Special Announcement on Flooding
in the Northern New Territories

Beginning Time Ending Time
Day/Month HKT Day/Month HKT
10 / 6 0315 10 / 6 0815


Table 2   Figures and Departures from Normal - June 2007

Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 31.2 degrees C 0.9 degree above normal
Mean Air Temperature 28.4 degrees C 0.6 degree above normal
Mean Daily Minimum Air Temperature 26.3 degrees C 0.4 degree above normal
Mean Dew Point Temperature 25.2 degrees C 0.8 degree above normal
Mean Relative Humidity 83 % 1 % above normal
Mean Cloud Amount 78 % 3 % above normal
Total Rainfall 490.1 mm 114.1 mm above normal
Number of hours of Reduced VisibilityΔ 16 hours 7.6 hours below normal§
Total Bright Sunshine Duration 154.7 hours 6.4 hours below normal
Mean Daily Global Solar Radiation 16.25 Megajoule / square metre 0.30 Megajoule below normal
Total Evaporation 126.8 mm 17.1 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.


 

The calibration factors of the pyranometer at King's Park in 2006 and 2007 have been re-computed based on the results of a regional instrument comparison in Asia in 2007. The readings of total global solar radiation at King's Park in 2006 and 2007 displayed in this web page before 13 June 2008 have been revised on 13 June 2008 using the new calibration factors.

  *   Departure from 1961-1990 climatological normal, except for number of hours of reduced visibility.
  §   Departure from mean value between 1997 and 2006.


daily values of selected meteorological elements for HK for June 2007

Extract of Meteorological Observations in Hong Kong for June 2007