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Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 04/Jul/2015
HKO Readings & Radiation Level

Yesterday's Weather and Radiation Level:

Hong Kong Observatory
Maximum Air Temperature                     32.4 C
Minimum Air Temperature                     29.3 C
Grass Minimum Temperature                   27.8 C
Relative Humidity                        70 - 85 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January           970.6 mm
Against an average of                     1130.8 mm

Other Stations                Min                  Max
King's Park                  28.8 C               33.0 C
Wong Chuk Hang               28.3 C               31.3 C
Ta Kwu Ling                  26.5 C               34.4 C
Lau Fau Shan                 28.3 C               33.0 C
Tai Po                       29.0 C               33.8 C
Sha Tin                      29.1 C               33.9 C
Tuen Mun                     28.6 C               33.6 C
Tseung Kwan O                28.3 C               33.7 C
Sai Kung                     28.8 C               34.2 C
Cheung Chau                  27.9 C               32.3 C
Chek Lap Kok                 30.1 C               34.6 C
Tsing Yi                     28.7 C               32.7 C
Shek Kong                    28.7 C               34.0 C
Tsuen Wan Ho Koon            28.0 C               31.1 C
Tsuen Wan Shing Mun Valley   28.5 C               32.4 C
Hong Kong Park               29.4 C               33.0 C
Shau Kei Wan                 27.9 C               32.6 C
Kowloon City                 28.5 C               33.9 C
Happy Valley                 29.3 C               32.8 C
Wong Tai Sin                 29.6 C               33.3 C
Stanley                      28.5 C               31.8 C
Kwun Tong                    29.0 C               33.4 C
Sham Shui Po                 28.9 C               33.0 C
Kai Tak Runway Park          28.2 C               32.7 C
Yuen Long Park               28.4 C               33.9 C

Duration of sunshine (King's Park):              6.5 H
The mean UV index recorded at King's Park yesterday was 4,
the UV intensity was Moderate.
The maximum UV index for yesterday was 10.
Sea surface temperature (Waglan Island):        24.8 C 

Yesterday's (03 Jul 2015) 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
Ping Chau                           0.08
Tap Mun                             0.08
Kat O                               0.10
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                         0.14
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
Chek Lap Kok                        0.14

  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 03 Jul
Last revision date: <04 Jul 2015>