Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 30/Oct/2025

HKO Readings & Radiation level

Yesterday's Weather and Radiation Level:
------------------------------------------------------

Hong Kong Observatory
Maximum Air Temperature                     25.5 C
Minimum Air Temperature                     22.9 C
Grass Minimum Temperature                   21.7 C
Relative Humidity                        65 - 80 Percent
Rainfall                                      Trace 
Total rainfall since 1st January          2545.2 mm
Against an average of                     2358.9 mm

Other Stations                Min                  Max
King's Park                  21.8 C               25.2 C
Wong Chuk Hang               23.2 C               26.0 C
Ta Kwu Ling                  20.1 C               26.5 C
Lau Fau Shan                 20.6 C               29.1 C
Tai Po                       22.0 C               26.2 C
Sha Tin                      22.2 C               26.4 C
Tuen Mun                     20.8 C               26.4 C
Tseung Kwan O                21.8 C               25.6 C
Sai Kung                     22.4 C               25.5 C
Cheung Chau                  22.7 C               26.2 C
Chek Lap Kok                 21.6 C               27.6 C
Tsing Yi                     22.7 C               26.2 C
Shek Kong                    20.7 C               26.0 C
Tsuen Wan Ho Koon            21.0 C               25.0 C
Tsuen Wan Shing Mun Valley   22.2 C               26.2 C
Hong Kong Park               22.5 C               25.0 C
Shau Kei Wan                 22.5 C               25.1 C
Kowloon City                 21.6 C               26.8 C
Happy Valley                 23.2 C               26.0 C
Wong Tai Sin                 21.9 C               25.8 C
Stanley                      22.7 C               25.9 C
Kwun Tong                    21.3 C               25.2 C
Sham Shui Po                 22.3 C               26.6 C
Kai Tak Runway Park          22.7 C               25.7 C
Yuen Long Park               21.1 C               27.5 C
Tai Mei Tuk                  21.8 C               25.0 C

Duration of sunshine (King's Park):0.5 H    
The mean UV index recorded at King's Park yesterday was 2the UV intensity was LOW 
The maximum UV index for yesterday was 5.

Yesterday's (29 Oct 2025) 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                           0.08
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                          0.08
King's Park                         0.15
Tsim Bei Tsui                       0.13
Cape D'Aguilar                      0.13
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.