Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 12/Jan/2025

HKO Readings & Radiation level

Yesterday's Weather and Radiation Level:
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Hong Kong Observatory
Maximum Air Temperature                     16.6 C
Minimum Air Temperature                     11.5 C
Grass Minimum Temperature                   10.0 C
Relative Humidity                        27 - 51 Percent
Rainfall                                       0 mm 
Total rainfall since 1st January              Trace
Against an average of                        9.2 mm

Other Stations                Min                  Max
King's Park                  10.1 C               17.4 C
Wong Chuk Hang               11.2 C               18.3 C
Ta Kwu Ling                   7.8 C               16.9 C
Lau Fau Shan                  9.0 C               17.0 C
Tai Po                        9.0 C               16.3 C
Sha Tin                      10.0 C               16.7 C
Tuen Mun                     10.4 C               16.9 C
Tseung Kwan O                 9.7 C               18.3 C
Sai Kung                     10.2 C               15.5 C
Cheung Chau                  10.2 C               18.8 C
Chek Lap Kok                 10.8 C               16.4 C
Tsing Yi                     10.2 C               17.9 C
Shek Kong                     9.2 C               17.4 C
Tsuen Wan Ho Koon             8.7 C               15.4 C
Tsuen Wan Shing Mun Valley    8.5 C               18.4 C
Hong Kong Park               10.9 C               17.8 C
Shau Kei Wan                 10.1 C               17.2 C
Kowloon City                  9.6 C               17.7 C
Happy Valley                 11.4 C               18.5 C
Wong Tai Sin                 10.3 C               17.6 C
Stanley                      10.8 C               16.8 C
Kwun Tong                    10.1 C               18.1 C
Sham Shui Po                 10.3 C               18.2 C
Kai Tak Runway Park          11.1 C               18.2 C
Yuen Long Park                9.6 C               18.2 C
Tai Mei Tuk                   9.3 C               16.4 C

Duration of sunshine (King's Park):              9.6 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):        17.3 C
Yesterday's (11 Jan 2025) average ambient gamma radiation
dose rate taken outdoors in Hong Kong ranged from 0.09 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                             0.09
Kat O                               0.10
Yuen Ng Fan                         0.12
Tai Mei Tuk                         0.12
Sha Tau Kok                         0.10
Kwun Tong                           0.13
Sai Wan Ho                          0.09
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.12
Chek Lap Kok                        0.15   


Note
1.     From readings taken at various locations in Hong Kong in the
       past, the hourly mean ambient gamma radiation dose rate may
       vary between 0.06 and 0.3 microsievert per hour. (1
       microsievert = 0.000001 sievert = 0.001 millisievert)

2.     Temporal variations are generally caused by changes in
       meteorological conditions such as rainfall, wind and
       barometric pressure.

3.     Spatial variations are generally caused by differences in
       the radioactive content of local rock and soil.

4.     The data displayed is provisional. Only limited data
       validation has been carried out.

5.     The range of relative humidity in the daily weather summary
       originates from the observer's reports of Hourly
       Readings of the day. This follows the long-term practice of
       collecting climatological data of the Hong Kong Observatory
       for over a century. It may differ from the relative humidity
       range derived from the 1-minute reports of the automatic
       weather station.