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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 24/Apr/2014
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     24.9 C
Minimum Air Temperature                     21.4 C
Grass Minimum Temperature                   22.1 C
Relative Humidity                        89 - 98 Percent
Rainfall                                    13.3 mm 
Total rainfall since 1st January           372.9 mm
Against an average of                      297.0 mm

Other Stations                Min                  Max
King's Park                  20.8 C               24.7 C
Wong Chuk Hang               21.9 C               24.9 C
Ta Kwu Ling                  20.8 C               24.3 C
Lau Fau Shan                 21.8 C               25.9 C
Tai Po                       20.9 C               24.2 C
Sha Tin                      20.7 C               24.5 C
Tuen Mun                     22.3 C               24.6 C
Tseung Kwan O                20.7 C               23.6 C
Sai Kung                     20.9 C               24.2 C
Cheung Chau                  21.4 C               23.7 C
Chek Lap Kok                 22.4 C               27.2 C
Tsing Yi                     22.2 C               25.4 C
Shek Kong                    21.9 C               25.5 C
Tsuen Wan Ho Koon            21.1 C               23.7 C
Tsuen Wan Shing Mun Valley   21.8 C               24.6 C
Hong Kong Park               21.4 C               24.8 C
Shau Kei Wan                 20.9 C               24.0 C
Kowloon City                 20.8 C               24.6 C
Happy Valley                 22.0 C               25.6 C
Wong Tai Sin                 21.7 C               25.4 C
Stanley                      21.4 C               24.1 C
Kwun Tong                    20.8 C               24.8 C
Sham Shui Po                 21.8 C               25.0 C

Duration of sunshine (King's Park):              0.0 H
The mean UV index recorded at King's Park yesterday was 0.6,
the UV intensity was Low.
The maximum UV index for yesterday was 1.
Sea surface temperature (Waglan Island):        22.1 C 

Yesterday's (23 Apr 2014) 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                           0.09
Tap Mun                             0.08
Kat O                               0.11
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.12
Sai Wan Ho                          0.10
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 1987-2013, 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 23 Apr
Last revision date: <24 Apr 2014>