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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 20/Dec/2014
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     14.7 C
Minimum Air Temperature                     10.7 C
Grass Minimum Temperature                   11.5 C
Relative Humidity                        69 - 95 Percent
Rainfall                                    14.3 mm 
Total rainfall since 1st January          2625.5 mm
Against an average of                     2385.6 mm

Other Stations                Min                  Max
King's Park                  10.0 C               14.1 C
Wong Chuk Hang               10.3 C               15.0 C
Ta Kwu Ling                  10.1 C               11.9 C
Lau Fau Shan                  9.7 C               13.2 C
Sha Tin                      10.4 C               13.8 C
Tuen Mun                     10.2 C               13.4 C
Tseung Kwan O                 9.8 C               13.9 C
Sai Kung                     10.9 C               14.2 C
Cheung Chau                  10.0 C               14.4 C
Chek Lap Kok                 11.1 C               15.6 C
Tsing Yi                     10.3 C               14.4 C
Shek Kong                     9.9 C               12.6 C
Tsuen Wan Ho Koon             9.5 C               12.7 C
Tsuen Wan Shing Mun Valley    9.7 C               14.3 C
Hong Kong Park                9.9 C               14.6 C
Shau Kei Wan                  9.8 C               14.2 C
Kowloon City                  9.9 C               13.9 C
Happy Valley                 10.8 C               14.8 C
Wong Tai Sin                 10.5 C               14.6 C
Stanley                       9.6 C               15.3 C
Kwun Tong                     9.9 C               13.8 C
Sham Shui Po                 11.0 C               15.1 C
Kai Tak Runway Park          10.8 C               14.9 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.6,
the UV intensity was Low.
The maximum UV index for yesterday was 2.
Sea surface temperature (Waglan Island):        18.5 C 

Yesterday's (19 Dec 2014) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
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                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.15

Note
  1. From readings taken at various locations in Hong Kong during the period 1987-2013, 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 19 Dec
Last revision date: <20 Dec 2014>