Yesterday's Weather and Radiation Level

HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
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Hong Kong Observatory
Maximum Air Temperature                     20.3 C
Minimum Air Temperature                     15.5 C
Grass Minimum Temperature                   15.7 C
Relative Humidity                        56 - 71 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2571.8 mm
Against an average of                     2365.1 mm

Other Stations                Min                  Max
King's Park                  14.7 C               20.9 C
Wong Chuk Hang               16.0 C               22.0 C
Ta Kwu Ling                  13.7 C               20.6 C
Lau Fau Shan                 13.9 C               20.1 C
Tai Po                       13.8 C               20.4 C
Sha Tin                      14.6 C               20.9 C
Tuen Mun                     14.8 C               21.9 C
Tseung Kwan O                14.4 C               21.7 C
Sai Kung                     14.7 C               19.6 C
Cheung Chau                  14.3 C               21.3 C
Chek Lap Kok                 15.3 C               21.5 C
Tsing Yi                     15.0 C               21.7 C
Shek Kong                    14.1 C               21.0 C
Tsuen Wan Ho Koon            13.1 C               19.4 C
Tsuen Wan Shing Mun Valley   13.3 C               21.6 C
Hong Kong Park               15.7 C               21.3 C
Shau Kei Wan                 15.0 C               22.1 C
Kowloon City                 14.2 C               20.5 C
Happy Valley                 15.9 C               22.0 C
Wong Tai Sin                 14.2 C               22.0 C
Stanley                      15.9 C               20.9 C
Kwun Tong                    14.9 C               21.4 C
Sham Shui Po                 14.9 C               22.5 C
Kai Tak Runway Park          15.2 C               21.5 C
Yuen Long Park               14.2 C               21.5 C
Tai Mei Tuk               13.8 C               20.8 C

Duration of sunshine (King's Park):              5.4 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):        22.4 C 

Yesterday's (23 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
                            (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

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.
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.
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.