Yesterday's Weather and Radiation Level

HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:
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Hong Kong Observatory
Maximum Air Temperature                     30.9 C
Minimum Air Temperature                     26.1 C
Grass Minimum Temperature                   25.7 C
Relative Humidity                        71 - 89 Percent
Rainfall                                      Trace 
Total rainfall since 1st January           621.5 mm
Against an average of                      563.8 mm

Other Stations                Min                  Max
King's Park                  25.8 C               30.8 C
Wong Chuk Hang               26.7 C               30.4 C
Ta Kwu Ling                  25.7 C               30.9 C
Lau Fau Shan                 25.3 C               32.5 C
Tai Po                       25.9 C               30.1 C
Sha Tin                      25.8 C               30.4 C
Tuen Mun                     25.6 C               31.5 C
Tseung Kwan O                25.4 C               30.2 C
Sai Kung                     26.0 C               28.9 C
Cheung Chau                  25.4 C               29.3 C
Chek Lap Kok                 27.1 C               32.8 C
Tsing Yi                     26.6 C               31.0 C
Shek Kong                    26.3 C               31.4 C
Tsuen Wan Ho Koon            24.8 C               31.5 C
Tsuen Wan Shing Mun Valley   26.1 C               30.3 C
Hong Kong Park               26.2 C               29.2 C
Shau Kei Wan                 25.2 C               29.1 C
Kowloon City                 26.2 C               31.7 C
Happy Valley                 26.5 C               31.0 C
Wong Tai Sin                 26.3 C               31.0 C
Stanley                      25.8 C               30.9 C
Kwun Tong                    25.6 C               29.6 C
Sham Shui Po                 26.1 C               31.7 C

Duration of sunshine (King's Park):              5.0 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 13.
Sea surface temperature (Waglan Island):        26.9 C 

Yesterday's (25 May 2012) 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                           0.09
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                         0.13
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.15

Note

From readings taken at various locations in Hong Kong during
the period 1987-2011, the background ambient gamma radiation
levels may vary between 0.06 and 0.30 microsievert per hour.
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.
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.