Weather Report > Yesterday's Weather and Radiation Level
Bulletin updated at 00:15 HKT 21/ Jan /2019

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 23.4°C
Minimum Air Temperature: 18.1°C
Grass Minimum Temperature: 16.3°C
Relative Humidity: 60 - 91%
Rainfall: 0.1 mm

Total rainfall since 1st January: 4.7 mm
Against an average of 14.3 mm

Other Stations Min Max
King's Park 16.3°C 24.9°C
Ta Kwu Ling 17.4°C 26.6°C
Wong Chuk Hang 18.0°C 25.4°C
Lau Fau Shan 17.2°C 23.9°C
Tai Po 17.0°C 22.8°C
Sha Tin 17.3°C 25.2°C
Tuen Mun 17.2°C 25.5°C
Tseung Kwan O 16.3°C 24.4°C
Sai Kung 17.3°C 23.2°C
Cheung Chau 17.2°C 24.2°C
Chek Lap Kok 19.1°C 24.5°C
Tsing Yi 17.9°C 25.8°C
Shek Kong 17.5°C 27.0°C
Tsuen Wan Ho Koon 16.8°C 25.6°C
Tsuen Wan Shing Mun Valley 17.7°C 26.0°C
Hong Kong Park 17.6°C 24.5°C
Shau Kei Wan 16.9°C 23.0°C
Kowloon City 17.6°C 25.6°C
Happy Valley 17.5°C 25.4°C
Wong Tai Sin 18.3°C 25.5°C
Stanley 17.3°C 23.3°C
Kwun Tong 17.6°C 23.8°C
Kai Tak Runway Park 18.0°C 23.4°C
Yuen Long Park 17.0°C 26.3°C
Duration of Sunshine (King's Park): 5.2 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 5.

Yesterday's (20 Jan) 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 0.15
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 0.09
Tsim Bei Tsui 0.13
Cape D'Aguilar0.13
Chek Lap Kok0.15


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.
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