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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 26/May/2016
HKO Readings & Radiation Level

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

Hong Kong Observatory
Maximum Air Temperature                     30.9 C
Minimum Air Temperature                     26.2 C
Grass Minimum Temperature                   25.1 C
Relative Humidity                        71 - 90 Percent
Rainfall                                      trace 
Total rainfall since 1st January           807.1 mm
Against an average of                      563.8 mm

Other Stations                Min                  Max
King's Park                  25.4 C               30.7 C
Wong Chuk Hang               24.7 C               30.4 C
Ta Kwu Ling                  24.6 C               31.1 C
Lau Fau Shan                 25.1 C               32.4 C
Tai Po                       25.3 C               29.6 C
Sha Tin                      24.3 C               30.6 C
Tuen Mun                     25.2 C               31.5 C
Tseung Kwan O                24.4 C               29.4 C
Sai Kung                     25.3 C               29.9 C
Cheung Chau                  25.0 C               29.6 C
Chek Lap Kok                 26.4 C               33.0 C
Tsing Yi                     24.9 C               31.9 C
Shek Kong                    24.3 C               32.0 C
Tsuen Wan Ho Koon            23.7 C               30.5 C
Tsuen Wan Shing Mun Valley   23.8 C               30.6 C
Hong Kong Park               25.0 C               31.2 C
Shau Kei Wan                 25.2 C               29.7 C
Kowloon City                 25.6 C               30.0 C
Happy Valley                 25.0 C               31.4 C
Wong Tai Sin                 25.5 C               30.7 C
Stanley                      25.3 C               30.4 C
Kwun Tong                    25.7 C               29.9 C
Sham Shui Po                 25.6 C               31.3 C
Kai Tak Runway Park          25.6 C               29.8 C
Yuen Long Park               25.0 C               31.8 C

Duration of sunshine (King's Park):              8.8 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.
Sea surface temperature (Waglan Island):        25.9 C 

Yesterday's (25 May 2016) 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
                            (microsievert/hour)
Ping Chau                           0.08
Tap Mun                             0.09
Kat O                               0.09
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.13
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

Note
  1. From readings taken at various locations in Hong Kong during the period 1987-2015, 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 25 May
Last revision date: <26 May 2016>