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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 31/Jul/2016
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     33.5 C
Minimum Air Temperature                     28.7 C
Grass Minimum Temperature                   27.2 C
Relative Humidity                        59 - 89 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1407.5 mm
Against an average of                     1464.7 mm

Other Stations                Min                  Max
King's Park                  28.3 C               33.2 C
Wong Chuk Hang               27.5 C               35.2 C
Ta Kwu Ling                  23.3 C               35.8 C
Lau Fau Shan                 24.6 C               34.3 C
Tai Po                       23.4 C               34.2 C
Sha Tin                      25.0 C               36.4 C
Tuen Mun                     27.4 C               36.0 C
Tseung Kwan O                25.9 C               36.4 C
Sai Kung                     27.4 C               35.5 C
Cheung Chau                  26.9 C               33.6 C
Chek Lap Kok                 28.8 C               36.7 C
Tsing Yi                     25.4 C               33.7 C
Shek Kong                    24.6 C               35.8 C
Tsuen Wan Ho Koon            23.4 C               32.7 C
Tsuen Wan Shing Mun Valley   24.8 C               33.8 C
Hong Kong Park               28.3 C               35.7 C
Shau Kei Wan                 26.9 C               36.0 C
Kowloon City                 27.2 C               35.7 C
Happy Valley                 28.6 C               36.5 C
Wong Tai Sin                 27.4 C               35.4 C
Stanley                      27.7 C               34.2 C
Kwun Tong                    28.8 C               35.4 C
Sham Shui Po                 26.4 C               35.0 C
Kai Tak Runway Park          27.0 C               34.3 C
Yuen Long Park               25.1 C               36.3 C

Duration of sunshine (King's Park):              6.3 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 9.
Sea surface temperature (Waglan Island):        25.3 C 

Yesterday's (30 Jul 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
Ping Chau                           0.08
Tap Mun                             0.09
Kat O                               0.09
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                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

  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 30 Jul
Last revision date: <31 Jul 2016>