Yesterday's Weather and Radiation Level

Bulletin issued at 00:15 HKT 13/Mar/2025

HKO Readings & Radiation level

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

Hong Kong Observatory
Maximum Air Temperature                     24.3 C
Minimum Air Temperature                     21.4 C
Grass Minimum Temperature                   20.6 C
Relative Humidity                        74 - 95 Percent
Rainfall                                     2.8 mm 
Total rainfall since 1st January            50.9 mm
Against an average of                       95.4 mm

Other Stations                Min                  Max
King's Park                  20.9 C               24.6 C
Wong Chuk Hang               21.0 C               25.2 C
Ta Kwu Ling                  21.0 C               28.4 C
Lau Fau Shan                 21.3 C               27.4 C
Tai Po                       20.8 C               25.0 C
Sha Tin                      20.7 C               26.1 C
Tuen Mun                     21.4 C               25.9 C
Tseung Kwan O                20.2 C               24.4 C
Cheung Chau                  19.6 C               22.4 C
Chek Lap Kok                 21.1 C               26.9 C
Tsing Yi                     21.6 C               25.7 C
Shek Kong                    21.0 C               28.3 C
Tsuen Wan Ho Koon            20.1 C               25.0 C
Tsuen Wan Shing Mun Valley   20.8 C               26.4 C
Hong Kong Park               20.8 C               23.3 C
Shau Kei Wan                 20.3 C               23.8 C
Kowloon City                 20.6 C               25.6 C
Happy Valley                 21.4 C               25.3 C
Wong Tai Sin                 21.3 C               27.0 C
Stanley                      20.8 C               23.4 C
Kwun Tong                    20.7 C               24.8 C
Sham Shui Po                 21.8 C               26.3 C
Kai Tak Runway Park          20.1 C               23.3 C
Yuen Long Park               21.8 C               28.5 C
Tai Mei Tuk                  20.3 C               26.1 C

Duration of sunshine (King's Park):              0.5 H
The mean UV index recorded at King's Park yesterday was 1,
the UV intensity was LOW.
The maximum UV index for yesterday was 4.
Sea Surface Temperature (Waglan Island):        17.8 C
Yesterday's (12 Mar 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                           0.09
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                          0.08
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.