Hong Kong weather in May ‘abnormally hot’, says Observatory

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  • Records show May 2020 had the second highest mean minimum temperature ever at 25.9 degrees Celsius
  • There was also 16 per cent more rain last month, compared to historical averages
Wong Tsui-kai |
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The Hong Kong Observatory (HKO) has described May as ‘abnormally hot’, which continued a trend of a warm spring which started in March.

Observatory records show this May had the second highest mean minimum temperature recording ever at 25.9 degrees Celsius, 1.8 degrees higher than average.

There was also more rain than usual, with 352.5 millimetres of rain, 16 per cent more than historical averages.

The weather was mostly fine and hot for the first ten days of the month due to a weather phenomenon called an anticyclone, meaning a spinning circulation of wind around an area of high pressure.

Experimental Officer at the HKO Cheung Sze-yuen explained the effects of an anticyclone. “It basically makes for good weather, the opposite of a trough of low pressure”.

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The weather for the latter half of the month was not as sunny, as two troughs of low pressure over southern China and the coast brought heavy showers and thunderstorms over the city with sunny intervals on May 24 and the last day of the month.

The red rainstorm warning was issued on May 21, 25 and 30.

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