EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG, DECEMBER 2007
EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 2007
| Date DECEMBER |
Mean Pressure (hPa) |
Air Temperature | Mean Dew Point Temperature (deg. C) |
Mean Relative Humidity (%) |
Mean Amount of Cloud (%) |
Total Rainfall (mm) | ||
|---|---|---|---|---|---|---|---|---|
| Maximum (deg. C) |
Mean (deg. C) |
Minimum (deg. C) | ||||||
| 1 | 1022.2 | 21.3 | 18.4 | 16.1 | 13.4 | 73 | 50 | - |
| 2 | 1020.8 | 24.0 | 20.4 | 18.3 | 14.3 | 69 | 45 | - |
| 3 | 1021.9 | 23.2 | 20.0 | 17.9 | 12.0 | 61 | 20 | - |
| 4 | 1024.2 | 20.9 | 18.6 | 16.3 | 12.4 | 68 | 51 | - |
| 5 | 1024.3 | 20.4 | 18.7 | 17.3 | 12.4 | 67 | 85 | - |
| 6 | 1021.9 | 21.4 | 19.4 | 17.6 | 12.9 | 67 | 82 | - |
| 7 | 1020.4 | 22.3 | 19.2 | 17.4 | 12.0 | 64 | 52 | - |
| 8 | 1020.4 | 20.8 | 18.4 | 16.8 | 13.2 | 72 | 55 | - |
| 9 | 1018.5 | 22.0 | 19.1 | 17.6 | 14.4 | 74 | 81 | - |
| 10 | 1017.3 | 21.8 | 19.7 | 18.4 | 15.7 | 78 | 45 | - |
| 11 | 1015.3 | 24.2 | 21.1 | 18.7 | 15.4 | 70 | 45 | - |
| 12 | 1013.5 | 24.6 | 21.6 | 20.1 | 16.6 | 73 | 43 | - |
| 13 | 1014.0 | 24.2 | 21.4 | 19.3 | 16.4 | 74 | 31 | Trace |
| 14 | 1016.2 | 21.4 | 19.5 | 18.3 | 15.2 | 76 | 53 | Trace |
| 15 | 1018.0 | 21.9 | 19.3 | 17.8 | 15.3 | 78 | 43 | - |
| 16 | 1019.8 | 21.1 | 19.4 | 18.6 | 15.4 | 78 | 77 | - |
| 17 | 1018.7 | 24.7 | 21.2 | 18.9 | 15.4 | 70 | 73 | Trace |
| 18 | 1018.3 | 23.5 | 21.0 | 19.9 | 16.8 | 77 | 64 | - |
| 19 | 1018.5 | 20.1 | 19.6 | 19.1 | 16.4 | 82 | 88 | Trace |
| 20 | 1018.5 | 22.1 | 19.9 | 18.9 | 16.1 | 79 | 72 | - |
| 21 | 1016.7 | 23.4 | 21.2 | 19.4 | 17.6 | 80 | 56 | - |
| 22 | 1015.0 | 23.7 | 21.7 | 20.1 | 18.9 | 84 | 73 | Trace |
| 23 | 1015.3 | 20.8 | 20.1 | 18.6 | 18.1 | 88 | 92 | 1.1 |
| 24 | 1016.6 | 20.2 | 17.8 | 16.3 | 15.0 | 84 | 79 | 14.6 |
| 25 | 1018.6 | 19.4 | 17.3 | 16.0 | 12.3 | 72 | 73 | - |
| 26 | 1019.5 | 19.8 | 17.7 | 15.6 | 12.8 | 73 | 38 | Trace |
| 27 | 1016.9 | 20.6 | 18.2 | 16.5 | 13.6 | 74 | 18 | - |
| 28 | 1014.9 | 22.4 | 19.2 | 17.1 | 14.9 | 77 | 23 | - |
| 29 | 1016.1 | 20.7 | 18.1 | 15.6 | 11.5 | 66 | 57 | - |
| 30 | 1019.3 | 18.7 | 15.9 | 14.2 | 6.3 | 54 | 68 | - |
| 31 | 1022.6 | 16.7 | 14.0 | 12.0 | 1.0 | 41 | 23 | - |
| Mean/Total | 1018.5 | 21.7 | 19.3 | 17.6 | 14.0 | 72 | 57 | 15.7 |
| Normal* | 1020.2 | 20.5 | 17.6 | 15.4 | 11.2 | 68 | 49 | 27.3 |
| Station | Hong Kong Observatory | |||||||
| Date DECEMBER |
Number of hours of Reduced Visibility# (hours) |
Total Bright Sunshine (hours) |
Daily Global Solar Radiation (MJ/m2) |
Total Evaporation (mm) |
Prevailing Wind Direction (degrees) |
Mean Wind Speed (km/h) |
|---|---|---|---|---|---|---|
| 1 | 1 | 8.9 | 16.47 | 2.9 | 070 | 27.4 |
| 2 | 9 | 8.2 | 15.48 | 3.6 | 020 | 17.3 |
| 3 | 22 | 9.3 | 14.52 | 3.3 | 350 | 22.2 |
| 4 | 24 | 8.7 | 14.02 | 3.1 | 060 | 31.7 |
| 5 | 24 | 0.5 | 6.92 | 2.9 | 060 | 28.6 |
| 6 | 24 | 4.6 | 11.62 | 2.8 | 030 | 14.3 |
| 7 | 24 | 8.0 | 13.14 | 2.9 | 070 | 18.5 |
| 8 | 24 | 8.9 | 14.98 | 3.0 | 060 | 33.7 |
| 9 | 24 | 3.9 | 11.12 | 2.3 | 060 | 25.7 |
| 10 | 1 | 9.0 | 15.69 | 2.9 | 060 | 21.8 |
| 11 | 2 | 7.3 | 14.51 | 3.0 | 010 | 14.1 |
| 12 | 7 | 8.2 | 14.02 | 2.2 | 040 | 9.1 |
| 13 | 21 | 7.7 | 12.46 | 3.4 | 360 | 10.7 |
| 14 | 23 | 7.9 | 13.89 | 2.8 | 070 | 25.1 |
| 15 | 24 | 8.6 | 14.40 | 3.0 | 070 | 29.0 |
| 16 | 24 | 5.7 | 11.31 | 2.5 | 060 | 32.9 |
| 17 | 19 | 1.5 | 7.54 | 1.9 | 050 | 14.2 |
| 18 | 20 | 4.3 | 10.10 | 1.9 | 070 | 15.9 |
| 19 | 22 | - | 1.41 | 1.2 | 010 | 15.7 |
| 20 | 20 | 4.4 | 10.42 | 2.4 | 070 | 25.0 |
| 21 | 2 | 9.0 | 15.45 | 1.7 | 040 | 17.5 |
| 22 | 7 | 0.6 | 6.54 | 1.6 | 070 | 13.1 |
| 23 | 2 | - | 2.44 | 3.2 | 060 | 32.2 |
| 24 | 5 | 0.7 | 7.03 | 2.7 | 350 | 25.2 |
| 25 | 9 | 2.2 | 7.28 | 1.8 | 350 | 23.3 |
| 26 | 8 | 9.4 | 16.08 | 3.1 | 070 | 27.9 |
| 27 | 4 | 9.4 | 15.49 | 2.8 | 070 | 22.0 |
| 28 | 15 | 8.6 | 15.25 | 2.7 | 070 | 16.6 |
| 29 | 9 | 4.3 | 11.33 | 3.9 | 350 | 26.7 |
| 30 | 0 | 3.8 | 11.10 | 4.2 | 350 | 32.5 |
| 31 | 0 | 9.2 | 15.41 | 4.1 | 350 | 31.8 |
| Mean/Total | 420 | 182.8 | 11.85 | 85.8 | 060 | 22.6 |
| Normal* | 230.4§ | 181.5 | 12.03 | 111.5 | 080 | 25.5 |
| Station | Hong Kong International Airport |
King's Park | Waglan Island^ | |||
The minimum pressure recorded at the Hong Kong Observatory was 1011.1 hectopascals at 1600 HKT on 12 December.
The maximum air temperature recorded at the Hong Kong Observatory was 24.7 degrees C at 1433 HKT on 17 December.
The minimum air temperature recorded at the Hong Kong Observatory was 12.0 degrees C at 0728 HKT on 31 December.
The maximum gust peak speed recorded at Waglan Island was 56 kilometres per hour from 070 degrees at 0144 HKT on 27 December.
The maximum instantaneous rate of rainfall recorded at King's Park was 7 millimetres per hour at 0142 HKT on 24 December.
# Reduced visibility refers to visibility below 8 kilometres when there is no fog, mist, or precipitation.
- 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 Parkd 2007 displayed in this web page before 13 June 2008 have been revised on 13 June 2008 using the new calibration factors.
^ In case the data are not available from Waglan Island, observations of Cheung Chau or other nearby weather stations will be incorporated in computing the Prevailing Wind Direction and Mean Wind Speed.
* 1961-1990 Climatological Normal, unless otherwise specified
§ 1997-2006 Mean value