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                     20.7 C
Minimum Air Temperature                     17.3 C
Grass Minimum Temperature                   18.4 C
Relative Humidity                        69 - 84 Percent
Rainfall                                       0 mm 
Total rainfall since 1st january           146.3 mm
Against an average of                      114.2 mm

Other Stations                Min                  Max
King's Park                  16.7 C               21.0 C
Wong Chuk Hang               17.3 C               21.6 C
Ta Kwu Ling                  16.6 C               22.3 C
Lau Fau Shan                 16.8 C               22.1 C
Tai Po                       17.1 C               21.2 C
Sha Tin                      17.2 C               21.6 C
Tuen Mun                     17.5 C               21.7 C
Tseung Kwan O                16.8 C               20.5 C
Sai Kung                     17.0 C               20.7 C
Cheung Chau                  16.1 C               20.9 C
Chek Lap Kok                 17.9 C               22.6 C
Tsing Yi                     16.7 C               21.8 C
Shek Kong                    17.4 C               22.8 C
Tsuen Wan                    16.1 C               21.2 C
Hong Kong Park               17.3 C               21.9 C
Shau Kei Wan                 16.6 C               19.8 C
Kowloon City                 16.1 C               22.0 C
Happy Valley                 16.9 C               21.5 C
Wong Tai Sin                 17.0 C               22.3 C
Stanley                      17.1 C               20.3 C
Kwun Tong                    16.3 C               19.8 C
Sham Shui Po                    17.4 C               22.1 C

Duration of sunshine (King's Park):              0.2 H
The mean UV index recorded at King's Park yesterday was 2,
The UV intensity was LOW.
The maximum UV index for yesterday was 5.
Sea Surface Temperature (Waglan Island):        19.2 C
Yesterday's (17 Mar 2010) Average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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
                            (Microsieverts/Hour)
Ping Chau                           0.10
Tap Mun                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.10
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.10
King's Park                         0.14
Tsim Bei Tsui                       0.13

Note
1.     From readings taken at various locations in Hong Kong during
       the period 1987-2007, the background ambient gamma radiation
       levels may vary between 0.06 and 0.3 microsievert per hour.

2.     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.

3.     For example, if ambient gamma radiation is the only factor
       contributing to the radiation dose to a person, this dose of
       5000 microsieverts may be reached when the ambient gamma
       dose rate is 1000 microsieverts per hour (more than 3000
       times above background) and lasts for 5 hours; or when the
       dose rate is 200 microsieverts per hour (more than 600 times
       above background) and lasts for 25 hours.