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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 22/Feb/2018
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     19.4 C
Minimum Air Temperature                     16.7 C
Grass Minimum Temperature                   16.6 C
Relative Humidity                        76 - 90 Percent
Rainfall                                      trace 
Total rainfall since 1st January            62.2 mm
Against an average of                       65.6 mm

Other Stations                Min                  Max
King's Park                  16.1 C               19.3 C
Wong Chuk Hang               16.6 C               20.7 C
Ta Kwu Ling                  15.5 C               19.9 C
Lau Fau Shan                 15.8 C               20.4 C
Tai Po                       16.1 C               18.7 C
Sha Tin                      15.9 C               19.5 C
Tuen Mun                     16.9 C               20.1 C
Tseung Kwan O                15.3 C               18.2 C
Sai Kung                     15.9 C               18.7 C
Cheung Chau                  15.9 C               19.9 C
Chek Lap Kok                 17.1 C               21.9 C
Tsing Yi                     16.6 C               20.9 C
Shek Kong                    16.6 C               21.9 C
Tsuen Wan Ho Koon            15.5 C               20.3 C
Tsuen Wan Shing Mun Valley   16.2 C               20.6 C
Hong Kong Park               16.5 C               19.1 C
Shau Kei Wan                 15.3 C               18.1 C
Kowloon City                 15.7 C               20.3 C
Happy Valley                 16.6 C               19.8 C
Wong Tai Sin                 15.8 C               20.4 C
Stanley                      15.7 C               18.4 C
Kwun Tong                    15.4 C               18.6 C
Sham Shui Po                 16.9 C               20.9 C
Kai Tak Runway Park          16.4 C               19.0 C
Yuen Long Park               16.9 C               21.8 C
Tai Mei Tuk               15.3 C               19.9 C

Duration of sunshine (King's Park):              0 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was Low.
The maximum UV index for yesterday was 3.
Sea surface temperature (Waglan Island):        16.3 C 

Yesterday's (21 Feb 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                               0.11
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                        0.15

  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 21 Feb
Last revision date: <22 Feb 2018>