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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 20/Apr/2018
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     26.3 C
Minimum Air Temperature                     21.4 C
Grass Minimum Temperature                   19.9 C
Relative Humidity                        65 - 84 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           108.9 mm
Against an average of                      273.5 mm

Other Stations                Min                  Max
King's Park                  20.4 C               25.8 C
Wong Chuk Hang               19.5 C               26.5 C
Ta Kwu Ling                  19.3 C               27.9 C
Lau Fau Shan                 18.7 C               28.4 C
Tai Po                       19.4 C               24.4 C
Sha Tin                      19.4 C               26.0 C
Tuen Mun                     19.9 C               26.7 C
Tseung Kwan O                18.4 C               24.8 C
Sai Kung                     19.4 C               24.2 C
Cheung Chau                  20.3 C               26.0 C
Chek Lap Kok                 21.2 C               28.4 C
Tsing Yi                     19.7 C               27.7 C
Shek Kong                    18.5 C               28.6 C
Tsuen Wan Ho Koon            17.7 C               27.0 C
Tsuen Wan Shing Mun Valley   18.7 C               27.2 C
Hong Kong Park               20.0 C               25.9 C
Shau Kei Wan                 20.1 C               24.1 C
Kowloon City                 20.0 C               26.4 C
Happy Valley                 20.1 C               27.3 C
Wong Tai Sin                 19.8 C               26.0 C
Stanley                      21.2 C               24.8 C
Kwun Tong                    20.2 C               25.2 C
Sham Shui Po                 20.3 C               26.6 C
Kai Tak Runway Park          21.3 C               24.3 C
Yuen Long Park               18.3 C               28.4 C
Tai Mei Tuk               19.8 C               27.0 C

Duration of sunshine (King's Park):              8.4 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 9.
Sea surface temperature (Waglan Island):        22.5 C 

Yesterday's (19 Apr 2018) 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                          0.09
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 in the past, the hourly mean ambient gamma radiation dose rate may vary between 0.06 and 0.3 microsievert per hour. (1 microsievert = 0.000001 sievert = 0.001 millisievert)
  2. Temporal variations are generally caused by changes in meteorological conditions such as rainfall, wind and barometric pressure.
  3. Spatial variations are generally caused by differences in the radioactive content of local rock and soil.
  4. The data displayed is provisional. Only limited data validation has been carried out.
Climatological Information for 19 Apr
Last revision date: <20 Apr 2018>