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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 23/Jan/2017
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     19.8 C
Minimum Air Temperature                     13.6 C
Grass Minimum Temperature                   12.6 C
Relative Humidity                        44 - 75 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January             3.4 mm
Against an average of                       14.8 mm

Other Stations                Min                  Max
King's Park                  12.8 C               20.3 C
Ta Kwu Ling                   7.2 C               21.3 C
Lau Fau Shan                 10.5 C               20.1 C
Tai Po                       10.7 C               19.8 C
Sha Tin                      12.5 C               19.9 C
Tuen Mun                     12.7 C               21.6 C
Tseung Kwan O                11.3 C               21.2 C
Sai Kung                     12.3 C               18.2 C
Cheung Chau                  12.2 C               18.6 C
Chek Lap Kok                 13.9 C               19.7 C
Tsing Yi                     13.4 C               21.1 C
Shek Kong                    10.3 C               22.1 C
Tsuen Wan Ho Koon            10.4 C               20.6 C
Tsuen Wan Shing Mun Valley   11.0 C               21.7 C
Hong Kong Park               13.1 C               20.5 C
Shau Kei Wan                 12.7 C               19.5 C
Kowloon City                 12.2 C               21.8 C
Happy Valley                 12.5 C               20.8 C
Wong Tai Sin                 12.6 C               21.5 C
Stanley                      13.3 C               18.8 C
Kwun Tong                    12.6 C               20.1 C
Sham Shui Po                 12.8 C               21.8 C
Kai Tak Runway Park          14.1 C               20.0 C
Yuen Long Park               12.0 C               22.6 C
Tai Mei Tuk               12.0 C               20.1 C

Duration of sunshine (King's Park):              9.8 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 6.
Sea surface temperature (Waglan Island):        19.5 C 

Yesterday's (22 Jan 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                      0.14
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.
Climatological Information for 22 Jan
Last revision date: <23 Jan 2017>