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Bulletin updated at 00:15 HKT
21/ Feb /2018

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 25.0 C
Minimum Air Temperature: 18.8 C
Grass Minimum Temperature: 18.0 C
Relative Humidity: 75 - 92 percent
Rainfall: Trace

Total Rainfall since 1st January: 62.2 mm
Against an average of 64.3 mm

Other Stations
King's Park
18.2 C
26.3 C
Wong Chuk Hang
18.1 C
24.5 C
Ta Kwu Ling
17.1 C
27.7 C
Lau Fau Shan
18.4 C
23.2 C
Tai Po
17.9 C
24.4 C
Tuen Mun
19.5 C
26.5 C
Tseung Kwan O
17.4 C
24.8 C
Sai Kung
17.7 C
22.7 C
Cheung Chau
18.4 C
23.1 C
Chek Lap Kok
19.3 C
25.4 C
Tsing Yi
19.0 C
25.3 C
Shek Kong
18.3 C
27.1 C
Tsuen Wan Ho Koon
18.3 C
24.8 C
Tsuen Wan Shing Mun Valley
18.3 C
26.6 C
Hong Kong Park
18.7 C
24.2 C
Shau Kei Wan
17.1 C
24.2 C
Kowloon City
18.6 C
25.9 C
Happy Valley
18.4 C
26.0 C
Wong Tai Sin
19.1 C
26.5 C
17.5 C
22.3 C
Kwun Tong
18.1 C
25.6 C
Sham Shui Po
19.6 C
25.1 C

Duration of Sunshine (King's Park): 1.5 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 6.
Sea surface temperature (Waglan Island):17.1 C

Yesterday's (20 Feb) 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 :

Yesterday's average (microsievert/hour)
King's Park
Ping Chau
Tap Mun
Kat O
Yuen Ng Fan
Tai Mei Tuk
Sha Tau Kok
Kwun Tong
Sai Wan Ho
Tsim Bei Tsui

  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.