This report describes the typical weather at the Grantley Adams International Airport (Bridgetown, Barbados) weather station over the course of an average January. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Bridgetown has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (91%) and croplands (8%).
The month of January is characterized by essentially constant daily high temperatures, with daily highs around 83°F throughout the month, exceeding 85°F or dropping below 81°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 1 with 11:22 hours of daylight; the longest day is January 31 with 11:34 hours of daylight.
The earliest sunrise is at 6:20am on January 1; the latest sunset is at 5:59pm on January 31; the latest sunrise is at 6:25am on January 23; the earliest sunset is at 5:43pm on January 1.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 50% (partly 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 27% of the time, partly cloudy 38% of the time, and mostly cloudy or overcast 18% of the time.
The average probability that some form of precipitation will be observed in a given day is 63%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are moderate rain and light rain.
Moderate rain is the most severe precipitation observed during 69% of those days with precipitation. It is most likely around January 23, when it is observed during 44% of all days.
Light rain is the most severe precipitation observed during 27% of those days with precipitation. It is most likely around January 31, when it is observed during 18% 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 90% (very humid) over the course of a typical January, rarely dropping below 56% (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 68% (mildly humid) three days out of four; it is most humid around January 1, rising above 85% (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 67°F (muggy) to 74°F (very muggy) and is rarely below 64°F (mildy humid) or above 76°F (oppressive).
Over the course of January typical wind speeds vary from 7 mph to 17 mph (light breeze to moderate breeze), rarely exceeding 24 mph (strong breeze).
The highest average wind speed of 13 mph (moderate breeze) occurs around January 31, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 12 mph (moderate breeze) occurs around January 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).