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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 28/Apr/2015
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     30.3 C
Minimum Air Temperature                     21.8 C
Grass Minimum Temperature                   20.8 C
Relative Humidity                        60 - 87 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           166.6 mm
Against an average of                      318.9 mm

Other Stations                Min                  Max
King's Park                  20.9 C               28.6 C
Wong Chuk Hang               20.3 C               28.4 C
Ta Kwu Ling                  19.6 C               30.2 C
Lau Fau Shan                 19.9 C               27.9 C
Tai Po                       20.0 C               26.9 C
Sha Tin                      19.7 C               28.7 C
Tuen Mun                     20.5 C               29.9 C
Tseung Kwan O                19.6 C               28.9 C
Sai Kung                     19.9 C               26.6 C
Cheung Chau                  20.9 C               27.6 C
Chek Lap Kok                 22.4 C               29.6 C
Tsing Yi                     20.6 C               28.7 C
Shek Kong                    19.0 C               30.6 C
Tsuen Wan Ho Koon            18.9 C               29.3 C
Tsuen Wan Shing Mun Valley   19.7 C               29.6 C
Hong Kong Park               21.1 C               27.9 C
Shau Kei Wan                 20.8 C               26.2 C
Kowloon City                 21.0 C               29.3 C
Happy Valley                 21.4 C               30.2 C
Wong Tai Sin                 21.0 C               30.7 C
Stanley                      21.4 C               27.2 C
Kwun Tong                    21.0 C               28.9 C
Sham Shui Po                 21.6 C               29.5 C
Kai Tak Runway Park          21.9 C               25.7 C
Yuen Long Park               19.5 C               30.6 C

Duration of sunshine (King's Park):              10.6 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 9.
Sea surface temperature (Waglan Island):        23.4 C 

Yesterday's (27 Apr 2015) 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)
Ping Chau                           0.08
Tap Mun                             0.08
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.11
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.09
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.14
Chek Lap Kok                        0.15

Note
  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 27 Apr
Last revision date: <28 Apr 2015>