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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 24/Apr/2018
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     30.2 C
Minimum Air Temperature                     24.3 C
Grass Minimum Temperature                   22.9 C
Relative Humidity                        64 - 91 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           108.9 mm
Against an average of                      297.0 mm

Other Stations                Min                  Max
King's Park                  23.6 C               30.1 C
Wong Chuk Hang               23.7 C               28.2 C
Ta Kwu Ling                  22.6 C               30.7 C
Lau Fau Shan                 22.7 C               29.6 C
Tai Po                       23.3 C               29.8 C
Sha Tin                      23.6 C               30.7 C
Tuen Mun                     23.8 C               30.2 C
Tseung Kwan O                22.7 C               29.4 C
Sai Kung                     23.6 C               27.3 C
Cheung Chau                  23.0 C               29.5 C
Chek Lap Kok                 24.7 C               30.4 C
Tsing Yi                     23.7 C               29.6 C
Shek Kong                    23.5 C               31.4 C
Tsuen Wan Ho Koon            22.8 C               28.3 C
Tsuen Wan Shing Mun Valley   23.1 C               29.3 C
Hong Kong Park               24.0 C               29.0 C
Shau Kei Wan                 23.1 C               29.3 C
Kowloon City                 23.6 C               30.8 C
Happy Valley                 24.1 C               30.0 C
Wong Tai Sin                 23.6 C               29.4 C
Stanley                      23.3 C               28.1 C
Kwun Tong                    23.5 C               30.4 C
Sham Shui Po                 24.2 C               28.8 C
Kai Tak Runway Park          24.0 C               29.3 C
Yuen Long Park               23.2 C               30.8 C
Tai Mei Tuk               23.3 C               32.0 C

Duration of sunshine (King's Park):              7.1 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 8.
Sea surface temperature (Waglan Island):        23.8 C 

Yesterday's (23 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                             0.08
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                         0.15
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 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 23 Apr
Last revision date: <24 Apr 2018>