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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 01/May/2016
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     23.4 C
Minimum Air Temperature                     20.8 C
Grass Minimum Temperature                   21.4 C
Relative Humidity                        72 - 92 Percent
Rainfall                                     1.5 mm 
Total rainfall since 1st January           651.8 mm
Against an average of                      336.1 mm

Other Stations                Min                  Max
King's Park                  19.8 C               23.9 C
Wong Chuk Hang               21.7 C               24.6 C
Ta Kwu Ling                  19.7 C               24.6 C
Lau Fau Shan                 19.7 C               26.7 C
Tai Po                       20.3 C               22.8 C
Sha Tin                      20.7 C               23.3 C
Tuen Mun                     21.0 C               25.0 C
Tseung Kwan O                19.9 C               22.4 C
Sai Kung                     20.7 C               23.0 C
Cheung Chau                  20.4 C               23.5 C
Chek Lap Kok                 20.7 C               26.5 C
Tsing Yi                     20.6 C               25.1 C
Shek Kong                    20.7 C               25.8 C
Tsuen Wan Ho Koon            19.9 C               24.6 C
Tsuen Wan Shing Mun Valley   20.7 C               25.1 C
Hong Kong Park               20.4 C               24.5 C
Shau Kei Wan                 20.1 C               22.4 C
Kowloon City                 20.1 C               23.4 C
Happy Valley                 21.4 C               24.5 C
Wong Tai Sin                 20.7 C               25.1 C
Stanley                      20.7 C               22.9 C
Kwun Tong                    20.0 C               22.9 C
Sham Shui Po                 20.8 C               25.6 C
Kai Tak Runway Park          20.9 C               23.1 C
Yuen Long Park               20.8 C               26.1 C

Duration of sunshine (King's Park):              0.3 H
The mean UV index recorded at King's Park yesterday was 2,
the UV intensity was Low.
The maximum UV index for yesterday was 5.
Sea surface temperature (Waglan Island):        22.2 C 

Yesterday's (30 Apr 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                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

  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 Apr
Last revision date: <01 May 2016>