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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 28/Feb/2017
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     19.8 C
Minimum Air Temperature                     15.4 C
Grass Minimum Temperature                   14.9 C
Relative Humidity                        40 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January            27.7 mm
Against an average of                       77.3 mm

Other Stations                Min                  Max
King's Park                  14.7 C               19.9 C
Wong Chuk Hang               14.8 C               19.3 C
Ta Kwu Ling                  14.3 C               21.0 C
Lau Fau Shan                 14.3 C               21.8 C
Tai Po                       14.5 C               19.2 C
Sha Tin                      14.6 C               20.2 C
Tuen Mun                     14.5 C               20.8 C
Tseung Kwan O                14.1 C               19.9 C
Sai Kung                     14.6 C               18.1 C
Cheung Chau                  14.5 C               18.4 C
Chek Lap Kok                 15.7 C               21.1 C
Tsing Yi                     15.0 C               20.4 C
Shek Kong                    14.7 C               20.7 C
Tsuen Wan Ho Koon            13.5 C               19.7 C
Tsuen Wan Shing Mun Valley   14.6 C               20.7 C
Hong Kong Park               15.2 C               20.1 C
Shau Kei Wan                 14.7 C               18.5 C
Kowloon City                 14.5 C               20.2 C
Happy Valley                 15.5 C               20.3 C
Wong Tai Sin                 14.7 C               19.3 C
Stanley                      15.3 C               18.2 C
Kwun Tong                    14.8 C               18.9 C
Sham Shui Po                 15.2 C               22.1 C
Kai Tak Runway Park          15.7 C               18.6 C
Yuen Long Park               14.5 C               20.9 C
Tai Mei Tuk               14.6 C               19.9 C

Duration of sunshine (King's Park):              7.1 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 8.

Yesterday's (27 Feb 2017) 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
Ping Chau                           0.08
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                           0.12
Sai Wan Ho                          0.09
King's Park                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

  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.
Climatological Information for 27 Feb
Last revision date: <28 Feb 2017>