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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 10/Feb/2016
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     21.2 C
Minimum Air Temperature                     12.7 C
Grass Minimum Temperature                   10.0 C
Relative Humidity                        42 - 66 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           278.2 mm
Against an average of                       41.5 mm

Other Stations                Min                  Max
King's Park                  11.7 C               22.8 C
Wong Chuk Hang               13.0 C               22.8 C
Ta Kwu Ling                   4.0 C               23.5 C
Lau Fau Shan                  8.6 C               21.4 C
Tai Po                        8.2 C               21.6 C
Sha Tin                       6.5 C               22.0 C
Tuen Mun                     10.0 C               24.3 C
Tseung Kwan O                 8.5 C               22.4 C
Sai Kung                      9.1 C               19.2 C
Cheung Chau                  11.9 C               22.5 C
Chek Lap Kok                 12.3 C               22.1 C
Tsing Yi                     10.2 C               23.7 C
Shek Kong                     6.0 C               24.5 C
Tsuen Wan Ho Koon             9.4 C               23.7 C
Tsuen Wan Shing Mun Valley    7.8 C               24.6 C
Hong Kong Park               12.2 C               23.0 C
Shau Kei Wan                 13.0 C               20.4 C
Kowloon City                 12.6 C               23.5 C
Happy Valley                 10.1 C               22.8 C
Wong Tai Sin                 13.2 C               24.5 C
Stanley                      12.9 C               21.2 C
Kwun Tong                    12.9 C               21.2 C
Sham Shui Po                 11.0 C               23.3 C
Kai Tak Runway Park          13.4 C               21.2 C
Yuen Long Park                6.8 C               24.6 C

Duration of sunshine (King's Park):              10.2 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 7.
Sea surface temperature (Waglan Island):        15.0 C 

Yesterday's (09 Feb 2016) 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                         0.13
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note
  1. From readings taken at various locations in Hong Kong during the period 1987-2015, 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 09 Feb
Last revision date: <10 Feb 2016>