With the northeast monsoon over the south China coast weaker than normal for most of the time in the month, November 2023 was much warmer than usual in Hong Kong.  The monthly mean temperature of 23.5 degrees, monthly mean maximum temperature of 26.1 degrees and monthly mean minimum temperature of 21.6 degrees were 1.3 degrees, 1.6 degrees and 1.3 degrees above their corresponding normals and respectively one of the second, one of the third and one of the fourth highest on record for November.  Together with the higher than usual temperatures in September and October, the autumn of this year from September to November was also much warmer than usual.  The mean minimum temperature of 24.4 degrees, mean temperature of 26.1 degrees and mean maximum temperature of 28.8 degrees were respectively one of the highest, one of the second and fifth highest on record for the same period.  The month was drier than usual with a total rainfall of 3.3 millimetres, only about 8 percent of the normal figure of 39.3 millimetres.  Mainly attributing to record-breaking rainstorms in September and October, the autumn of this year was exceptionally wet with a total rainfall of 1616.4 millimetres, the highest on record for the same period.  The accumulated rainfall this year up to November was 2773.6 millimetres, about 15 percent above the normal figure of 2402.4 millimetres for the same period.

With the arrival of another replenishment of the northeast monsoon on 16 November, local weather was mainly cloudy at first on that day and became mainly fine and dry in the afternoon.  It was sunny and very dry with cool mornings on the next two days.  The temperature at the Observatory dropped to a minimum of 15.6 degrees on the morning of 17 November, the lowest of the month.  Under the influence of a dry northeast monsoon and the subsequent replenishment, fine and dry weather prevailed in Hong Kong from 19 – 28 November.  With a band of clouds covering the coast of Guangdong and under the influence of an easterly airstream, local weather turned cloudier with a few light rain patches on the last two days of November.

There was no tropical cyclone over the South China Sea and the western North Pacific in November 2023.

Details of issuance and cancellation of various warnings/signals in the month are summarized in Tables 1.1 to 1.2.  Monthly meteorological figures and departures from normal for November are tabulated in Table 2.