Bulletin issued at 00:15 HKT 28/Sep/2023
HKO Readings & Radiation level Yesterday's Weather and Radiation Level: ------------------------------------------------------ Hong Kong Observatory Maximum Air Temperature 33.9 C Minimum Air Temperature 28.6 C Grass Minimum Temperature 27.1 C Relative Humidity 58 - 81 Percent Rainfall Trace Total rainfall since 1st January 2216.6 mm Against an average of 2226.8 mm Other Stations Min Max King's Park 27.7 C 32.3 C Wong Chuk Hang 27.5 C 32.8 C Ta Kwu Ling 27.0 C 34.1 C Lau Fau Shan 26.6 C 35.2 C Tai Po 28.2 C 33.1 C Sha Tin 28.1 C 33.3 C Tuen Mun 27.8 C 32.0 C Tseung Kwan O 27.2 C 33.4 C Sai Kung 28.4 C 31.5 C Cheung Chau 27.0 C 31.3 C Chek Lap Kok 28.6 C 34.2 C Tsing Yi 28.0 C 33.3 C Tsuen Wan Ho Koon 25.8 C 32.3 C Tsuen Wan Shing Mun Valley 26.7 C 33.9 C Hong Kong Park 28.1 C 32.1 C Shau Kei Wan 27.6 C 30.7 C Kowloon City 27.6 C 33.7 C Happy Valley 28.6 C 34.2 C Wong Tai Sin 28.1 C 33.1 C Stanley 27.9 C 32.6 C Kwun Tong 27.4 C 32.5 C Sham Shui Po 28.2 C 33.5 C Kai Tak Runway Park 28.5 C 32.8 C Yuen Long Park 27.7 C 35.0 C Tai Mei Tuk 27.1 C 32.3 C Duration of sunshine (King's Park): 10.0 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 9. Yesterday's (27 Sep 2023) 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 (microsievert/hour) Ping Chau 0.09 Tap Mun 0.08 Kat O 0.09 Yuen Ng Fan 0.11 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 0.12 Chek Lap Kok 0.14 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.