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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 14/Dec/2017
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     19.0 C
Minimum Air Temperature                     17.9 C
Grass Minimum Temperature                   17.2 C
Relative Humidity                        74 - 83 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2381.4 mm

Other Stations                Min                  Max
King's Park                  17.5 C               19.3 C
Wong Chuk Hang               17.9 C               19.7 C
Ta Kwu Ling                  17.7 C               20.5 C
Lau Fau Shan                 17.0 C               21.7 C
Tai Po                       18.0 C               19.1 C
Sha Tin                      18.0 C               19.8 C
Tuen Mun                     17.7 C               20.5 C
Tseung Kwan O                17.6 C               18.8 C
Sai Kung                     18.1 C               19.2 C
Cheung Chau                  17.6 C               18.7 C
Chek Lap Kok                 18.6 C               21.4 C
Tsing Yi                     18.2 C               20.2 C
Shek Kong                    18.3 C               20.4 C
Tsuen Wan Ho Koon            16.7 C               19.0 C
Tsuen Wan Shing Mun Valley   17.8 C               19.3 C
Hong Kong Park               18.0 C               19.2 C
Shau Kei Wan                 17.3 C               18.7 C
Kowloon City                 17.4 C               19.3 C
Happy Valley                 18.1 C               19.6 C
Wong Tai Sin                 17.5 C               19.1 C
Stanley                      17.7 C               18.9 C
Kwun Tong                    17.3 C               18.6 C
Sham Shui Po                 18.3 C               20.7 C
Kai Tak Runway Park          18.3 C               19.4 C
Yuen Long Park               17.7 C               20.7 C
Tai Mei Tuk               17.5 C               19.7 C

Duration of sunshine (King's Park):              0.2 H
The mean UV index recorded at King's Park yesterday was 0.9,
the UV intensity was Low.
The maximum UV index for yesterday was 3.
Sea surface temperature (Waglan Island):        20.2 C 

Yesterday's (13 Dec 2017) 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                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.15
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 1987-2016, 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 13 Dec
Last revision date: <14 Dec 2017>