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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 22/Nov/2017

HKO Readings & Radiation level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     21.4 C
Minimum Air Temperature                     17.5 C
Grass Minimum Temperature                   18.8 C
Relative Humidity                        72 - 81 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2571.8 mm
Against an average of                     2364.2 mm

Other Stations                Min                  Max
King's Park                  16.8 C               21.5 C
Wong Chuk Hang               18.3 C               22.0 C
Ta Kwu Ling                  14.2 C               21.4 C
Tai Po                       14.8 C               20.6 C
Sha Tin                      15.7 C               21.3 C
Tuen Mun                     15.6 C               21.6 C
Tseung Kwan O                16.6 C               21.4 C
Sai Kung                     15.9 C               20.8 C
Cheung Chau                  16.5 C               22.0 C
Chek Lap Kok                 16.1 C               21.4 C
Tsing Yi                     17.5 C               22.1 C
Shek Kong                    15.0 C               21.7 C
Tsuen Wan Ho Koon            14.8 C               20.5 C
Tsuen Wan Shing Mun Valley   16.3 C               21.8 C
Hong Kong Park               18.0 C               21.2 C
Shau Kei Wan                 16.7 C               21.0 C
Kowloon City                 16.0 C               21.8 C
Happy Valley                 18.3 C               21.9 C
Wong Tai Sin                 15.9 C               21.7 C
Stanley                      17.5 C               21.9 C
Kwun Tong                    16.4 C               21.3 C
Sham Shui Po                 16.7 C               22.1 C
Kai Tak Runway Park          18.0 C               21.7 C
Yuen Long Park               15.0 C               21.5 C
Tai Mei Tuk               15.0 C                      

Duration of sunshine (King's Park):              0.6 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was LOW.
The maximum UV index for yesterday was 4.
Sea Surface Temperature (Waglan Island):        22.8 C
Yesterday's (21 Nov 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                         0.11
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   

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.

Yesterday's Radiation Level Yesterday's Radiation Level
Climatological Information for 21 Nov Climatological Information for 21 November
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