Singapore, 1 December 2022 – The prevailing Northeast Monsoon conditions are expected to persist over the next few months. During this period, the low-level winds are forecast to blow mainly from the northwest or northeast. The current wet weather is likely to continue, with thundery showers expected on most days in the next fortnight.
2 Climatologically, December is the wettest month of the year. In the first half of December 2022, the monsoon rain band is forecast to lie close to the equator and bring shower activities to the surrounding region of Singapore. Short-duration moderate to heavy thundery showers are expected over parts of the island in the afternoon on most days. The showers may extend into the evening on occasions. In addition, in the early part of the fortnight, low-pressure systems developing in the region are forecast to bring a temporary shift in the winds to blow from the southwest or west over Singapore and the surrounding vicinity. This may result in the passage of Sumatra squalls bringing widespread thundery showers with occasional gusty winds in the morning on a few days. The total rainfall for the first fortnight of December 2022 is forecast to be near average over most parts of Singapore.
3 During the fortnight, the daily temperature is forecast to range between 24 degrees Celsius and 33 degrees Celsius on most days. Although thundery showers are expected on most days, the daily maximum temperature could reach a high of around 34 degrees Celsius on a few days.
4 For updates of the daily weather forecast, please visit the MSS website (www.weather.gov.sg), NEA website (www.nea.gov.sg), or download the myENV app.
REVIEW (1 – 30 November 2022)
5 In the first fortnight of November 2022, inter-monsoon conditions prevailed over Singapore, with prevailing winds generally light and variable in direction. In the latter half of November 2022, the low-level winds gradually strengthened and blew mostly from the northeast or northwest. This change in monsoonal winds signalled the start of the Northeast Monsoon season.
6 The monsoon rain band was located over the equatorial Southeast Asia region and brought wet weather over Singapore on most days in November 2022. Large-scale convergence of winds over Singapore and the surrounding vicinity led to the development of several Sumatra squalls that brought widespread showers and gusty winds between the early and pre-dawn hours on many days. Thundery showers also fell over the island on several afternoons and nights. The Sumatra squall which brought gusty winds and heavy thundery showers in the early hours of 14 November 2022 resulted in a daily total rainfall of 157.2mm recorded around the Jurong West area. This was the highest daily total rainfall for November 2022.
7 The daily maximum temperature was below 33 degrees Celsius on most days in November 2022 due to the rainy weather. There were five days when the daily maximum temperature was higher than 34 degrees Celsius. The highest daily maximum temperature for November 2022 was 35.6 degrees Celsius recorded at Ang Mo Kio on 16 November 2022. The rainy weather and cloudy skies on 5 November 2022 brought the minimum temperature around Jurong area to a low of 21.8 degrees Celsius.
8 In November 2022, rainfall was above average for most of Singapore except for the southern part of the island, where rainfall was below-average. The highest rainfall anomaly of 87 per cent above average was recorded at Yio Chu Kang. The anomaly was lowest at Sentosa at 37 per cent below average.
CLIMATE STATION STATISTICS
Long-term Statistics for December
(Climatological reference period: 1991 – 2020)
| Average daily maximum temperature: | 30.5 °C |
| Average daily minimum temperature: | 24.3 °C |
| Average monthly temperature: | 26.8 °C |
| Average rainfall: | 331.9 mm |
| Average number of rain days: | 19 |
Historical Extremes for December
(Rainfall since 1869 and temperature since 1929)
| Highest monthly mean daily maximum temperature: | 31.6 °C (2016, 2018) |
| Lowest monthly mean daily minimum temperature: | 21.9 °C (1933) |
| Highest monthly rainfall ever recorded: | 765.9 mm (2006) |
| Lowest monthly rainfall ever recorded: | 62.5 mm (1932) |