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Yesterday's Weather and Radiation Level

Bulletin issued at 09:10 HKT 29/Jul/2015
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     32.9 C
Minimum Air Temperature                     27.5 C
Grass Minimum Temperature                   25.8 C
Relative Humidity                        61 - 87 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          1372.5 mm
Against an average of                     1439.0 mm

Other Stations                Min                  Max
King's Park                  26.7 C               32.5 C
Wong Chuk Hang               26.2 C               31.1 C
Ta Kwu Ling                  24.2 C               33.5 C
Lau Fau Shan                 26.1 C               32.7 C
Tai Po                       25.5 C               32.0 C
Sha Tin                      25.4 C               32.6 C
Tuen Mun                     26.2 C               32.3 C
Tseung Kwan O                25.2 C               32.5 C
Sai Kung                     25.8 C               31.7 C
Chek Lap Kok                 27.7 C               33.2 C
Tsing Yi                     25.4 C               31.6 C
Shek Kong                    24.9 C               33.3 C
Tsuen Wan Ho Koon            24.8 C               30.8 C
Tsuen Wan Shing Mun Valley   25.1 C               32.3 C
Hong Kong Park               26.9 C               32.1 C
Shau Kei Wan                 26.5 C               31.5 C
Kowloon City                 26.4 C               32.2 C
Happy Valley                 27.1 C               32.5 C
Wong Tai Sin                 26.5 C               33.1 C
Stanley                      26.8 C               31.2 C
Kwun Tong                    26.5 C               32.1 C
Sham Shui Po                 27.2 C               32.3 C
Kai Tak Runway Park          26.8 C               31.2 C
Yuen Long Park               25.5 C               33.1 C

Duration of sunshine (King's Park):              9.3 H
The mean UV index recorded at King's Park yesterday was 6,
the UV intensity was High.
The maximum UV index for yesterday was 12.

Yesterday's (28 Jul 2015) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.08 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
Ping Chau                           0.08
Tap Mun                             0.08
Kat O                               0.10
Yuen Ng Fan                         0.11
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

  1. From readings taken at various locations in Hong Kong during the period 1987-2014, 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.
Climatological Information for 28 Jul
Last revision date: <29 Jul 2015>