Hong Kong Observatory - Yesterday's Weather and Radiation Level
  • Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 26.5°C
Minimum Air Temperature: 22.6°C
Grass Minimum Temperature: 23.8°C
Relative Humidity: 69 - 93%
Rainfall: 3.3 mm

Total rainfall since 1st January: 545.0 mm
Against an average of 533.2 mm
Bulletin updated at 00:15 HKT 22/ May /2019
Other Stations Min Max
King's Park 21.9°C 25.9°C
Ta Kwu Ling 21.6°C 27.4°C
Wong Chuk Hang 22.0°C 26.5°C
Lau Fau Shan 21.8°C 28.1°C
Tai Po 21.6°C 25.4°C
Sha Tin 22.7°C 26.6°C
Tuen Mun 22.5°C 27.0°C
Tseung Kwan O 21.5°C 25.6°C
Sai Kung 22.5°C 26.1°C
Cheung Chau 21.8°C 26.4°C
Chek Lap Kok 23.3°C 28.2°C
Tsing Yi 22.5°C 27.2°C
Shek Kong 21.9°C 27.3°C
Tsuen Wan Ho Koon 21.3°C 25.4°C
Tsuen Wan Shing Mun Valley 22.2°C 26.3°C
Hong Kong Park 21.6°C 26.1°C
Shau Kei Wan 21.3°C 25.2°C
Kowloon City 22.0°C 26.8°C
Happy Valley 22.1°C 27.0°C
Wong Tai Sin 22.4°C 26.6°C
Stanley 21.6°C 25.9°C
Kwun Tong 22.3°C 25.8°C
Sham Shui Po 22.6°C 27.1°C
Kai Tak Runway Park 22.4°C 26.2°C
Yuen Long Park 22.2°C 28.1°C
Tai Mei Tuk 20.8°C 27.8°C
Duration of Sunshine (King's Park): 0.2 H

The mean UV Index recorded at King's Park yesterday was 2, the UV intensity was low.

The maximum UV Index for yesterday was 4.

Yesterday's (21 May) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.09 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
King's Park 0.14
Ping Chau 0.09
Tap Mun 0.09
Kat O 0.11
Yuen Ng Fan 0.12
Tai Mei Tuk 0.11
Sha Tau Kok 0.10
Kwun Tong 0.13
Sai Wan Ho 0.09
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.