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Bulletin updated at 00:15 HKT
25/ Jul /2017

Yesterday's Weather and Radiation Level

Hong Kong Observatory:
Maximum Air Temperature: 31.2 C
Minimum Air Temperature: 25.8 C
Grass Minimum Temperature: 25.1 C
Relative Humidity: 77 - 98 percent
Rainfall: 3.3 mm

Total Rainfall since 1st January: 1759.8 mm
Against an average of 1398.6 mm

Other Stations
Min
Max
King's Park
25.5 C
30.9 C
Wong Chuk Hang
25.6 C
31.0 C
Ta Kwu Ling
25.3 C
31.5 C
Lau Fau Shan
24.9 C
29.7 C
Tai Po
25.3 C
28.8 C
Sha Tin
25.9 C
31.5 C
Tuen Mun
25.4 C
30.7 C
Tseung Kwan O
25.1 C
30.3 C
Sai Kung
25.6 C
30.4 C
Cheung Chau
25.2 C
29.6 C
Chek Lap Kok
26.2 C
32.6 C
Tsing Yi
25.4 C
31.9 C
Shek Kong
25.4 C
31.2 C
Tsuen Wan Ho Koon
24.7 C
30.3 C
Tsuen Wan Shing Mun Valley
25.1 C
30.7 C
Hong Kong Park
25.3 C
30.8 C
Shau Kei Wan
25.3 C
30.1 C
Kowloon City
25.5 C
31.0 C
Happy Valley
25.6 C
32.1 C
Wong Tai Sin
25.2 C
31.6 C
Stanley
25.3 C
31.0 C
Kwun Tong
25.8 C
30.1 C
Sham Shui Po
25.8 C
31.9 C

Duration of Sunshine (King's Park): 4.6 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 11.
Sea surface temperature (Waglan Island):// C

Yesterday's (24 Jul) average ambient gamma radiation dose rate taken outdoors in Hong Kong ranged from 0.07 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
0.07
Tap Mun
0.08
Kat O
0.08
Yuen Ng Fan
0.11
Tai Mei Tuk
0.11
Sha Tau Kok
0.10
Kwun Tong
0.11
Sai Wan Ho
0.09
Tsim Bei Tsui
0.12

Note
  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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