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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 17/Jul/2018
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     31.4 C
Minimum Air Temperature                     25.7 C
Grass Minimum Temperature                   24.0 C
Relative Humidity                        67 - 93 Percent
Rainfall                                     5.8 mm 
Total rainfall since 1st January           873.8 mm
Against an average of                     1276.0 mm

Other Stations                Min                  Max
King's Park                  25.4 C               30.7 C
Wong Chuk Hang               25.9 C               30.6 C
Ta Kwu Ling                  25.6 C               31.7 C
Lau Fau Shan                 24.5 C               31.0 C
Tai Po                       25.6 C               29.6 C
Sha Tin                      26.1 C               31.6 C
Tuen Mun                     26.4 C               31.6 C
Tseung Kwan O                25.2 C               30.6 C
Sai Kung                     26.1 C               30.0 C
Cheung Chau                  25.1 C               29.3 C
Chek Lap Kok                 26.7 C               32.4 C
Tsing Yi                     26.2 C               31.3 C
Shek Kong                    26.1 C               31.4 C
Tsuen Wan Ho Koon            24.8 C               29.6 C
Tsuen Wan Shing Mun Valley   25.3 C               30.5 C
Hong Kong Park               25.1 C               30.0 C
Shau Kei Wan                 25.2 C               30.1 C
Kowloon City                 25.0 C               30.7 C
Happy Valley                 26.4 C               32.1 C
Wong Tai Sin                 25.5 C               30.4 C
Stanley                      25.8 C               30.0 C
Kwun Tong                    25.6 C               29.9 C
Sham Shui Po                 25.8 C               32.4 C
Kai Tak Runway Park          26.1 C               30.1 C
Yuen Long Park               25.8 C               32.2 C
Tai Mei Tuk               25.4 C               30.5 C

Duration of sunshine (King's Park):              5.6 H
The mean UV index recorded at King's Park yesterday was 5,
the UV intensity was Moderate.
The maximum UV index for yesterday was 12.
Sea surface temperature (Waglan Island):        28.2 C 

Yesterday's (16 Jul 2018) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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                           0.08
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.08
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.13

  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 16 Jul
Last revision date: <17 Jul 2018>