This report describes the typical weather at the Paya Lebar Air Base (RSAF) (Singapore) weather station over the course of an average January. 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 January is characterized by essentially constant daily high temperatures, with daily highs around 87°F throughout the month, exceeding 91°F or dropping below 82°F only one day in ten.
Over the course of January, the length of the day is essentially constant.
The earliest sunrise is at 7:06am on January 1; the latest sunset is at 7:19pm on January 31; the latest sunrise is at 7:16am on January 31; the earliest sunset is at 7:09pm on January 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 January 16, a representative day, the sky is clear or mostly clear 0% of the time, partly cloudy 7% of the time, and mostly cloudy or overcast 67% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around January 1, occurring in 67% of days. Precipitation is least likely around January 29, occurring in 50% of days.
Throughout January, the most common forms of precipitation are thunderstorms and light rain.
Thunderstorms are the most severe precipitation observed during 56% of those days with precipitation. They are most likely around January 1, when it is observed during 39% of all days.
Light rain is the most severe precipitation observed during 26% of those days with precipitation. It is most likely around January 2, when it is observed during 17% of all days.
Either snow is exceptionally unlikely to fall at this location in January or this station does not reliably report precipitation types.
The relative humidity typically ranges from 64% (mildly humid) to 92% (very humid) over the course of a typical January, rarely dropping below 55% (mildly humid) and reaching as high as 99% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 69% (mildly humid) three days out of four; it is most humid around January 17, rising above 89% (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 January, the dew point typically varies from 72°F (very muggy) to 77°F (oppressive) and is rarely below 69°F (muggy) or above 79°F (oppressive).
Over the course of January typical wind speeds vary from 1 mph to 12 mph (light air to moderate breeze), rarely exceeding 17 mph (moderate breeze).
The highest average wind speed of 7 mph (light breeze) occurs around January 31, at which time the average daily maximum wind speed is 12 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around January 3, at which time the average daily maximum wind speed is 11 mph (gentle breeze).