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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 18/Dec/2017

HKO Readings & Radiation level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     14.0 C
Minimum Air Temperature                     10.8 C
Grass Minimum Temperature                   10.8 C
Relative Humidity                        59 - 68 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January          2572.1 mm
Against an average of                     2384.1 mm

Other Stations                Min                  Max
King's Park                   9.9 C               13.5 C
Wong Chuk Hang               11.0 C               14.8 C
Ta Kwu Ling                   8.5 C               12.9 C
Lau Fau Shan                  8.9 C               12.5 C
Tai Po                        9.4 C               13.2 C
Sha Tin                      10.1 C               14.0 C
Tuen Mun                      9.9 C               13.3 C
Tseung Kwan O                 9.8 C               14.7 C
Sai Kung                      9.9 C               12.8 C
Cheung Chau                   9.9 C               15.6 C
Chek Lap Kok                 10.6 C               14.0 C
Tsing Yi                     10.2 C               14.1 C
Shek Kong                     9.4 C               13.5 C
Tsuen Wan Ho Koon             8.1 C               12.4 C
Tsuen Wan Shing Mun Valley    8.9 C               15.2 C
Hong Kong Park               10.8 C               15.1 C
Shau Kei Wan                 10.0 C               14.7 C
Kowloon City                  9.5 C               13.2 C
Happy Valley                 11.2 C               15.7 C
Wong Tai Sin                  9.5 C               13.7 C
Stanley                      10.9 C               14.9 C
Kwun Tong                     9.5 C               14.6 C
Sham Shui Po                 10.5 C               14.3 C
Kai Tak Runway Park          11.1 C               14.6 C
Yuen Long Park                9.1 C               13.7 C
Tai Mei Tuk                9.1 C                      

Duration of sunshine (King's Park):              0.2 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 3.
Sea Surface Temperature (Waglan Island):        18.9 C
Yesterday's (17 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                          0.10
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 17 Dec Climatological Information for 17 December
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