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Bulletin updated at 00:15 HKT
22/ May /2018

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 34.7 C
Minimum Air Temperature: 28.1 C
Grass Minimum Temperature: 26.0 C
Relative Humidity: 56 - 85 percent
Rainfall: 0 mm

Total Rainfall since 1st January: 170.7 mm
Against an average of 533.2 mm

Other Stations
Min
Max
King's Park
27.3 C
33.4 C
Wong Chuk Hang
26.2 C
31.4 C
Ta Kwu Ling
24.0 C
34.6 C
Lau Fau Shan
26.3 C
33.6 C
Tai Po
25.8 C
33.8 C
Sha Tin
26.4 C
35.4 C
Tuen Mun
26.0 C
34.3 C
Tseung Kwan O
25.7 C
33.3 C
Sai Kung
26.5 C
31.7 C
Cheung Chau
26.1 C
33.9 C
Chek Lap Kok
28.1 C
34.8 C
Tsing Yi
26.8 C
33.0 C
Shek Kong
26.2 C
35.2 C
Tsuen Wan Ho Koon
25.5 C
31.9 C
Tsuen Wan Shing Mun Valley
26.3 C
32.5 C
Hong Kong Park
27.2 C
32.7 C
Shau Kei Wan
26.7 C
32.5 C
Kowloon City
27.4 C
35.4 C
Happy Valley
27.1 C
33.9 C
Wong Tai Sin
26.7 C
34.0 C
Stanley
26.6 C
32.5 C
Kwun Tong
27.5 C
34.3 C
Sham Shui Po
27.2 C
33.2 C

Duration of Sunshine (King's Park): 9.4 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.
Sea surface temperature (Waglan Island):26.5 C

Yesterday's (21 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 (microsievert/hour)
King's Park
0.15
Ping Chau
0.09
Tap Mun
0.09
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

Note
  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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