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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 09/Dec/2016
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     21.7 C
Minimum Air Temperature                     17.1 C
Grass Minimum Temperature                   15.4 C
Relative Humidity                        54 - 71 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          3020.2 mm
Against an average of                     2377.0 mm

Other Stations                Min                  Max
King's Park                  16.6 C               22.6 C
Wong Chuk Hang               14.4 C               22.5 C
Ta Kwu Ling                  10.7 C               23.0 C
Lau Fau Shan                 13.7 C               22.1 C
Tai Po                       13.5 C               22.0 C
Sha Tin                      14.4 C               22.3 C
Tuen Mun                     15.4 C               24.3 C
Tseung Kwan O                14.2 C               23.1 C
Sai Kung                     16.1 C               20.9 C
Cheung Chau                  15.0 C               21.2 C
Chek Lap Kok                 17.1 C               22.5 C
Shek Kong                    13.0 C               23.7 C
Tsuen Wan Ho Koon            13.6 C               23.0 C
Tsuen Wan Shing Mun Valley   13.0 C               24.6 C
Hong Kong Park               16.7 C               22.9 C
Shau Kei Wan                 15.8 C               22.0 C
Kowloon City                 15.8 C               24.1 C
Happy Valley                 16.1 C               23.0 C
Wong Tai Sin                 16.2 C               24.0 C
Stanley                      16.9 C               21.7 C
Kwun Tong                    16.0 C               22.3 C
Sham Shui Po                 15.5 C               23.9 C
Kai Tak Runway Park          16.7 C               22.2 C
Yuen Long Park               14.8 C               24.5 C

Duration of sunshine (King's Park):              9.3 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
Sea surface temperature (Waglan Island):        22.9 C 

Yesterday's (08 Dec 2016) 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
                            (microsievert/hour)
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                          0.10
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note
  1. From readings taken at various locations in Hong Kong during the period 1987-2015, 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 08 Dec
Last revision date: <09 Dec 2016>