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Bulletin updated at 00:15 HKT
22/ Apr /2019

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 30.1 C
Minimum Air Temperature: 23.2 C
Grass Minimum Temperature: 21.9 C
Relative Humidity: 77 - 97 percent
Rainfall: 0.3 mm

Total Rainfall since 1st January: 417.6 mm
Against an average of 283.2 mm

Other Stations
Min
Max
King's Park
23.0 C
30.1 C
Wong Chuk Hang
22.2 C
28.9 C
Ta Kwu Ling
23.0 C
29.3 C
Lau Fau Shan
21.9 C
29.8 C
Tai Po
22.3 C
29.0 C
Sha Tin
22.5 C
29.9 C
Tuen Mun
23.5 C
30.8 C
Tseung Kwan O
21.9 C
29.2 C
Sai Kung
22.3 C
27.6 C
Cheung Chau
22.2 C
28.7 C
Chek Lap Kok
24.9 C
30.3 C
Tsing Yi
22.8 C
29.5 C
Shek Kong
22.5 C
30.5 C
Tsuen Wan Ho Koon
22.2 C
26.8 C
Tsuen Wan Shing Mun Valley
22.2 C
28.8 C
Hong Kong Park
22.5 C
29.2 C
Shau Kei Wan
22.3 C
26.9 C
Kowloon City
22.8 C
29.7 C
Happy Valley
22.7 C
30.1 C
Wong Tai Sin
22.8 C
29.8 C
Stanley
22.7 C
28.2 C
Kwun Tong
23.0 C
29.8 C
Sham Shui Po
23.3 C
30.3 C

Duration of Sunshine (King's Park): 2.6 H
The mean UV Index recorded at King's Park yesterday was 3,
the UV intensity was Moderate
The maximum UV Index for yesterday was 6.
Yesterday's (21 Apr) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.09 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 (microsievert/hour)
King's Park
0.14
Ping Chau
0.09
Tap Mun
0.09
Kat O
0.10
Yuen Ng Fan
0.12
Tai Mei Tuk
0.11
Sha Tau Kok
0.10
Kwun Tong
0.12
Sai Wan Ho
0.09
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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