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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 27/May/2015
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     28.7 C
Minimum Air Temperature                     24.6 C
Grass Minimum Temperature                   24.8 C
Relative Humidity                        86 - 98 Percent
Rainfall                                    64.6 mm 
Total rainfall since 1st January           669.1 mm
Against an average of                      570.3 mm

Other Stations                Min                  Max
King's Park                  23.7 C               28.2 C
Wong Chuk Hang               24.0 C               28.4 C
Ta Kwu Ling                  24.9 C               28.1 C
Lau Fau Shan                 25.6 C               28.7 C
Tai Po                       24.6 C               27.0 C
Sha Tin                      24.1 C               27.2 C
Tuen Mun                     25.5 C               30.0 C
Tseung Kwan O                24.6 C               28.0 C
Sai Kung                     24.4 C               27.7 C
Cheung Chau                  23.1 C               27.7 C
Chek Lap Kok                 25.6 C               31.2 C
Tsing Yi                     24.1 C               28.0 C
Shek Kong                    25.4 C               29.3 C
Tsuen Wan Ho Koon            23.9 C               27.0 C
Tsuen Wan Shing Mun Valley   24.1 C               27.6 C
Shau Kei Wan                 24.0 C               28.9 C
Kowloon City                 23.9 C               28.9 C
Happy Valley                 24.8 C               29.1 C
Wong Tai Sin                 24.1 C               28.9 C
Stanley                      23.5 C               29.2 C
Kwun Tong                    24.3 C               29.1 C
Sham Shui Po                 24.1 C               29.1 C
Kai Tak Runway Park          24.5 C               29.3 C
Yuen Long Park               26.0 C               29.2 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.5,
the UV intensity was Low.
The maximum UV index for yesterday was 2.

Yesterday's (26 May 2015) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 to
0.14 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                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
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                        0.14

  1. From readings taken at various locations in Hong Kong during the period 1987-2014, 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 26 May
Last revision date: <27 May 2015>