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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 10/Oct/2015
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     29.4 C
Minimum Air Temperature                     24.8 C
Grass Minimum Temperature                   23.6 C
Relative Humidity                        60 - 78 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1771.9 mm
Against an average of                     2270.3 mm

Other Stations                Min                  Max
King's Park                  24.3 C               30.1 C
Wong Chuk Hang               24.7 C               29.7 C
Ta Kwu Ling                  23.0 C               31.1 C
Lau Fau Shan                 23.3 C               29.6 C
Tai Po                       23.2 C               28.9 C
Sha Tin                      24.6 C               29.7 C
Tuen Mun                     24.2 C               30.6 C
Tseung Kwan O                22.2 C               30.6 C
Sai Kung                     24.6 C               28.8 C
Cheung Chau                  23.8 C               30.6 C
Chek Lap Kok                 25.5 C               30.0 C
Tsing Yi                     23.0 C               30.6 C
Shek Kong                    23.5 C               30.8 C
Tsuen Wan Ho Koon            22.6 C               28.8 C
Tsuen Wan Shing Mun Valley   22.3 C               31.1 C
Hong Kong Park               24.8 C               30.5 C
Shau Kei Wan                 24.2 C               29.9 C
Kowloon City                 24.0 C               30.6 C
Happy Valley                 24.8 C               31.0 C
Wong Tai Sin                 24.5 C               31.6 C
Stanley                      24.4 C               29.7 C
Kwun Tong                    23.9 C               29.4 C
Sham Shui Po                 24.8 C               31.3 C
Kai Tak Runway Park          25.1 C               31.7 C
Yuen Long Park               23.8 C               31.7 C

Duration of sunshine (King's Park):              7.1 H
The mean UV index recorded at King's Park yesterday was 3,
the UV intensity was Moderate.
The maximum UV index for yesterday was 8.
Sea surface temperature (Waglan Island):        27.7 C 

Yesterday's (09 Oct 2015) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.15 microsievert per hour.  These are within the normal
range of fluctuation of the background radiation level in
Hong Kong (see Note). The average dose rates measured at the
radiation monitoring stations over various parts of the
territory were as follows :

Station                     Yesterday's average
Ping Chau                           0.08
Tap Mun                             0.08
Kat O                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

  1. From readings taken at various locations in Hong Kong during the period 1987-2014, the background ambient gamma radiation levels may vary between 0.06 and 0.30 microsievert per hour.
  2. The extent of health effects to a person as a result of exposure to radiation is expressed by a physical quantity called equivalent dose, in unit of sievert. Protective action may be required if there is an increase in the ambient gamma dose rate above background such that the total additional dose is expected to exceed 5000 microsieverts in a relatively short period of time. For example, a dose of 5000 microsieverts may be reached when the ambient gamma dose rate is 1000 microsieverts per hour (several thousand times above background) and lasts for 5 hours.
  3. The readings of ambient gamma radiation level from instrument are expressed in unit of gray, which is numerically equal to the gamma dose expressed in sievert.
Climatological Information for 09 Oct
Last revision date: <10 Oct 2015>