This report describes the typical weather at the Sangster International Airport (Montego Bay, Jamaica) weather station over the course of an average May. It is based on the historical records from 1974 to 2012. Earlier records are either unavailable or unreliable.
Montego Bay has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by oceans and seas (55%) and forests (41%).
The month of May is characterized by essentially constant daily high temperatures, with daily highs around 87°F throughout the month, exceeding 90°F or dropping below 84°F only one day in ten.
Over the course of May, the length of the day is essentially constant. The shortest day of the month is May 1 with 12:50 hours of daylight; the longest day is May 31 with 13:10 hours of daylight.
The earliest sunrise is at 5:34am on May 31; the latest sunset is at 6:45pm on May 31; the latest sunrise is at 5:44am on May 1; the earliest sunset is at 6:34pm on May 2.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover ranges from 39% (mostly clear) to 46% (partly cloudy). The trend is for the sky to be becoming cloudier with the median cloud cover increasing by 7% from the start to the end of the month.
On May 16, a representative day, the sky is clear or mostly clear 42% of the time, partly cloudy 20% of the time, and mostly cloudy or overcast 23% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 25, occurring in 46% of days. Precipitation is least likely around May 1, occurring in 37% of days.
Throughout May, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 44% of those days with precipitation. They are most likely around May 31, when it is observed during 25% of all days.
Moderate rain is the most severe precipitation observed during 31% of those days with precipitation. It is most likely around May 13, when it is observed during 14% of all days.
Light rain is the most severe precipitation observed during 23% of those days with precipitation. It is most likely around May 6, when it is observed during 10% of all days.
Either snow is exceptionally unlikely to fall at this location in May or this station does not reliably report precipitation types.
The relative humidity typically ranges from 65% (mildly humid) to 91% (very humid) over the course of a typical May, rarely dropping below 55% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around May 1, at which time the relative humidity drops below 70% (mildly humid) three days out of four; it is most humid around May 26, 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 May, the dew point typically varies from 69°F (muggy) to 77°F (oppressive) and is rarely below 65°F (mildy humid) or above 80°F (very oppressive).
Over the course of May typical wind speeds vary from 0 mph to 19 mph (calm to fresh breeze), rarely exceeding 25 mph (strong breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around May 1, at which time the average daily maximum wind speed is 19 mph (fresh breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around May 29, at which time the average daily maximum wind speed is 18 mph (moderate breeze).