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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 21/Apr/2019
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     26.2 C
Minimum Air Temperature                     21.9 C
Grass Minimum Temperature                   21.3 C
Relative Humidity                        94 - 97 Percent
Rainfall                                    43.6 mm 
Total rainfall since 1st January           417.3 mm
Against an average of                      277.4 mm

Other Stations                Min                  Max
King's Park                  21.3 C               25.7 C
Wong Chuk Hang               21.5 C               26.6 C
Ta Kwu Ling                  21.8 C               25.0 C
Lau Fau Shan                 20.8 C               26.6 C
Tai Po                       21.3 C               23.5 C
Sha Tin                      22.0 C               25.5 C
Tuen Mun                     21.4 C               25.9 C
Tseung Kwan O                21.1 C               24.8 C
Sai Kung                     21.7 C               24.2 C
Cheung Chau                  21.4 C               26.7 C
Chek Lap Kok                 22.1 C               28.8 C
Tsing Yi                     21.7 C               26.2 C
Shek Kong                    21.7 C               28.4 C
Tsuen Wan Shing Mun Valley   21.5 C               26.7 C
Hong Kong Park               21.3 C               25.7 C
Shau Kei Wan                 21.0 C               25.2 C
Kowloon City                 21.8 C               25.4 C
Happy Valley                 21.6 C               27.2 C
Wong Tai Sin                 22.0 C               25.8 C
Stanley                      21.5 C               25.7 C
Kwun Tong                    21.6 C               25.6 C
Sham Shui Po                 22.0 C               26.9 C
Kai Tak Runway Park          21.5 C               25.9 C
Yuen Long Park               21.6 C               27.6 C
Tai Mei Tuk               21.0 C               24.2 C

Duration of sunshine (King's Park):              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 (20 Apr 2019) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                           0.09
Tap Mun                             0.09
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.10
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 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 20 Apr
Last revision date: <21 Apr 2019>