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                     31.6 C
Minimum Air Temperature                     28.9 C
Grass Minimum Temperature                   28.0 C
Relative Humidity                        73 - 85 Percent
Rainfall                                     3.5 mm 
Total rainfall since 1st January          1905.1 mm
Against an average of                     1622.6 mm

Other Stations                Min                  Max
King's Park                  28.8 C               32.4 C
Wong Chuk Hang               27.7 C               31.6 C
Ta Kwu Ling                  26.4 C               33.8 C
Lau Fau Shan                 27.5 C               33.4 C
Sha Tin                      29.0 C               33.0 C
Tuen Mun                     28.2 C               33.2 C
Tseung Kwan O                28.1 C               33.4 C
Sai Kung                     27.9 C               33.1 C
Cheung Chau                  27.1 C               31.8 C
Chek Lap Kok                 29.7 C               33.7 C
Tsing Yi                     28.3 C               32.1 C
Shek Kong                    28.1 C               33.4 C
Tsuen Wan Ho Koon            27.3 C               30.5 C
Tsuen Wan Shing Mun Valley   28.3 C               32.1 C
Hong Kong Park               27.6 C               32.6 C
Shau Kei Wan                 28.8 C               31.7 C
Kowloon City                 28.4 C               32.9 C
Happy Valley                 28.3 C               32.0 C
Wong Tai Sin                 28.0 C               32.1 C
Stanley                      28.0 C               31.8 C
Kwun Tong                    27.6 C               32.0 C
Sham Shui Po                 28.2 C               32.5 C
Kai Tak Runway Park          27.4 C               32.0 C
Yuen Long Park               27.4 C               33.1 C
Tai Mei Tuk               28.0 C               33.0 C

Duration of sunshine (King's Park):              5.0 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 11.
Sea surface temperature (Waglan Island):        24.6 C 

Yesterday's (11 Aug 2017) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                             0.08
Kat O                               0.08
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.11
Sai Wan Ho                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.12
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

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.