Weather Report > Yesterday's Weather and Radiation Level
Bulletin updated at 00:15 HKT 23/ May /2018

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 34.8°C
Minimum Air Temperature: 27.9°C
Grass Minimum Temperature: 26.0°C
Relative Humidity: 55 - 81%
Rainfall: 0 mm

Total rainfall since 1st January: 170.7 mm
Against an average of 540.5 mm

Other Stations Min Max
King's Park 27.1°C 33.2°C
Ta Kwu Ling 24.1°C 34.3°C
Wong Chuk Hang 26.0°C 32.0°C
Lau Fau Shan 26.5°C 32.9°C
Tai Po 26.3°C 33.2°C
Sha Tin 26.2°C 33.7°C
Tuen Mun 26.6°C 35.2°C
Tseung Kwan O 25.2°C 32.8°C
Sai Kung 26.4°C 32.5°C
Cheung Chau 26.4°C 33.2°C
Chek Lap Kok 28.0°C 35.2°C
Tsing Yi 26.9°C 33.3°C
Shek Kong 26.1°C 35.4°C
Tsuen Wan Ho Koon 25.6°C 32.5°C
Tsuen Wan Shing Mun Valley 27.0°C 32.8°C
Shau Kei Wan 26.2°C 32.6°C
Kowloon City 27.3°C 34.1°C
Happy Valley 26.7°C 34.0°C
Wong Tai Sin 27.4°C 33.5°C
Stanley 26.6°C 32.6°C
Kwun Tong 27.4°C 33.5°C
Sham Shui Po 27.3°C 32.6°C
Kai Tak Runway Park 27.0°C 31.5°C
Yuen Long Park 25.9°C 34.1°C
Duration of Sunshine (King's Park): 8.3 H

The mean UV Index recorded at King's Park yesterday was 4, the UV intensity was moderate.

The maximum UV Index for yesterday was 8.

Sea surface temperature (Waglan Island): 26.2°C

Yesterday's (22 May) 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
King's Park 0.15
Ping Chau 0.09
Tap Mun 0.08
Kat O 0.10
Yuen Ng Fan 0.12
Tai Mei Tuk 0.12
Sha Tau Kok 0.10
Kwun Tong 0.10
Sai Wan Ho 0.08
Tsim Bei Tsui 0.13
Cape D'Aguilar0.13
Chek Lap Kok0.14


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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