This report describes the typical weather at the Paya Lebar Air Base (RSAF) (Singapore) weather station over the course of an average December. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Singapore has a tropical rainforest climate with no dry season. The area within 25 mi of this station is covered by croplands (45%), oceans and seas (41%), built-up areas (6%), shrublands (3%), and grasslands (3%).
The month of December is characterized by gradually falling daily high temperatures, with daily highs around 87°F throughout the month, exceeding 92°F or dropping below 82°F only one day in ten.
Over the course of December, the length of the day is essentially constant.
The earliest sunrise is at 6:52am on December 1; the latest sunset is at 7:09pm on December 31; the latest sunrise is at 7:06am on December 31; the earliest sunset is at 6:55pm on December 1.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 90% (mostly cloudy) and does not vary substantially over the course of the month.
On December 16, a representative day, the sky is clear or mostly clear 0% of the time, partly cloudy 9% of the time, and mostly cloudy or overcast 68% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around December 1, occurring in 83% of days. Precipitation is least likely around December 31, occurring in 67% of days.
Throughout December, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 65% of those days with precipitation. They are most likely around December 1, when it is observed during 60% of all days.
Light rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around December 30, when it is observed during 16% of all days.
Either snow is exceptionally unlikely to fall at this location in December or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 93% (very humid) over the course of a typical December, rarely dropping below 56% (mildly humid) and reaching as high as 99% (very humid).
The air is driest around December 3, at which time the relative humidity drops below 70% (humid) three days out of four; it is most humid around December 1, rising above 91% (very humid) three days out of four.
Dew point is often a better measure of how comfortable a person will find the weather than relative humidity because it more directly relates to whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid.
Over the course of a typical December, the dew point typically varies from 73°F (very muggy) to 78°F (oppressive) and is rarely below 70°F (muggy) or above 80°F (very oppressive).
Over the course of December typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 17 mph (moderate breeze).
The highest average wind speed of 6 mph (light breeze) occurs around December 30, at which time the average daily maximum wind speed is 11 mph (gentle breeze).
The lowest average wind speed of 4 mph (light breeze) occurs around December 1, at which time the average daily maximum wind speed is 9 mph (gentle breeze).