This report describes the typical weather at the Robert L. Bradshaw International Airport (Basseterre, St. Kitts and Nevis) weather station over the course of an average April. It is based on the historical records from 1999 to 2012. Earlier records are either unavailable or unreliable.
Basseterre has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by oceans and seas (95%), grasslands (3%), and forests (2%).
The month of April is characterized by essentially constant daily high temperatures, with daily highs around 84°F throughout the month, exceeding 87°F or dropping below 82°F only one day in ten.
Over the course of April, the length of the day is essentially constant. The shortest day of the month is April 2 with 12:20 hours of daylight; the longest day is April 30 with 12:46 hours of daylight.
The earliest sunrise is at 5:45am on April 30; the latest sunset is at 6:31pm on April 30; the latest sunrise is at 6:05am on April 1; the earliest sunset is at 6:24pm on April 2.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 55% (partly cloudy) to 64% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 10% from the start to the end of the month.
On April 15, a representative day, the sky is clear or mostly clear 19% of the time, partly cloudy 21% of the time, and mostly cloudy or overcast 26% of the time.
The average probability that some form of precipitation will be observed in a given day is 33%, with little variation over the course of the month.
Throughout April, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 66% of those days with precipitation. It is most likely around April 8, when it is observed during 22% of all days.
Moderate rain is the most severe precipitation observed during 28% of those days with precipitation. It is most likely around April 27, when it is observed during 10% of all days.
Either snow is exceptionally unlikely to fall at this location in April or this station does not reliably report precipitation types.
The relative humidity typically ranges from 64% (mildly humid) to 89% (very humid) over the course of a typical April, rarely dropping below 57% (mildly humid) and reaching as high as 99% (very humid).
The air is driest around April 1, at which time the relative humidity drops below 68% (mildly humid) three days out of four; it is most humid around April 24, rising above 84% (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 April, the dew point typically varies from 68°F (muggy) to 74°F (very muggy) and is rarely below 65°F (mildy humid) or above 77°F (oppressive).
Over the course of April typical wind speeds vary from 6 mph to 14 mph (light breeze to moderate breeze), rarely exceeding 18 mph (fresh breeze).
The highest average wind speed of 10 mph (gentle breeze) occurs around April 18, at which time the average daily maximum wind speed is 14 mph (moderate breeze).
The lowest average wind speed of 10 mph (gentle breeze) occurs around April 12, at which time the average daily maximum wind speed is 13 mph (moderate breeze).