Weather Report > Yesterday's Weather and Radiation Level
Bulletin updated at 00:15 HKT 30/ May /2017

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 30.3°C
Minimum Air Temperature: 24.9°C
Grass Minimum Temperature: 25.3°C
Relative Humidity: 61 - 82%
Rainfall: 0 mm

Total rainfall since 1st January: 533.8 mm
Against an average of 611.5 mm

Other Stations Min Max
King's Park 24.3°C 29.6°C
Ta Kwu Ling 23.8°C 32.8°C
Wong Chuk Hang 24.4°C 28.9°C
Lau Fau Shan 23.5°C 32.4°C
Tai Po 24.5°C 29.2°C
Sha Tin 24.7°C 30.6°C
Tuen Mun 24.3°C 31.7°C
Tseung Kwan O 24.0°C 30.1°C
Sai Kung 24.9°C 29.8°C
Cheung Chau 24.2°C 28.5°C
Chek Lap Kok 25.5°C 31.4°C
Tsing Yi 25.2°C 30.9°C
Shek Kong 24.8°C 32.9°C
Tsuen Wan Ho Koon 23.3°C 30.0°C
Tsuen Wan Shing Mun Valley 24.6°C 31.1°C
Hong Kong Park 24.8°C 31.3°C
Shau Kei Wan 24.2°C 27.8°C
Kowloon City 24.3°C 29.7°C
Happy Valley 25.0°C 30.8°C
Wong Tai Sin 24.4°C 30.6°C
Stanley 24.6°C 28.2°C
Kwun Tong 24.3°C 29.0°C
Sham Shui Po 25.0°C 30.8°C
Kai Tak Runway Park 25.0°C 27.7°C
Yuen Long Park 24.2°C 33.1°C
Duration of Sunshine (King's Park): 10.5 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 10.

Yesterday's (29 May) 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
King's Park 0.14
Ping Chau 0.08
Tap Mun 0.08
Kat O 0.09
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 Kok0.14


1. From readings taken at various locations in Hong Kong during the period 1987-2016, the background ambient gamma radiation levels may vary between 0.06 and 0.30 microsievert per hour.
2. The extent of health effects to a person as a result of exposure to radiation is expressed by a physical quantity called equivalent dose, in unit of sievert. Protective action may be required if there is an increase in the ambient gamma dose rate above background such that the total additional dose is expected to exceed 5000 microsieverts in a relatively short period of time. For example, a dose of 5000 microsieverts may be reached when the ambient gamma dose rate is 1000 microsieverts per hour (several thousand times above background) and lasts for 5 hours.
3. The readings of ambient gamma radiation level from instrument are expressed in unit of gray, which is numerically equal to the gamma dose expressed in sievert.
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