This report describes the typical weather at the Sangster International Airport (Montego Bay, Jamaica) weather station over the course of an average July. 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 July is characterized by essentially constant daily high temperatures, with daily highs around 89°F throughout the month, exceeding 91°F or dropping below 86°F only one day in ten.
Over the course of July, the length of the day is essentially constant. The shortest day of the month is July 31 with 12:57 hours of daylight; the longest day is July 1 with 13:13 hours of daylight.
The earliest sunrise is at 5:39am on July 1; the latest sunset is at 6:53pm on July 4; the latest sunrise is at 5:49am on July 31; the earliest sunset is at 6:46pm on July 31.
Daylight saving time (DST) is not observed in 2012.
The median cloud cover is 45% (partly cloudy) and does not vary substantially over the course of the month.
On July 16, a representative day, the sky is clear or mostly clear 40% of the time, partly cloudy 22% of the time, and mostly cloudy or overcast 20% of the time.
The average probability that some form of precipitation will be observed in a given day is 44%, with little variation over the course of the month.
Throughout July, the most common forms of precipitation are thunderstorms, moderate rain, and light rain.
Thunderstorms are the most severe precipitation observed during 73% of those days with precipitation. They are most likely around July 31, when it is observed during 35% of all days.
Moderate rain is the most severe precipitation observed during 15% of those days with precipitation. It is most likely around July 2, when it is observed during 8% of all days.
Light rain is the most severe precipitation observed during 11% of those days with precipitation. It is most likely around July 1, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in July or this station does not reliably report precipitation types.
The relative humidity typically ranges from 63% (mildly humid) to 89% (very humid) over the course of a typical July, rarely dropping below 56% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around July 1, at which time the relative humidity drops below 67% (mildly humid) three days out of four; it is most humid around July 23, 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 July, the dew point typically varies from 70°F (muggy) to 77°F (oppressive) and is rarely below 67°F (muggy) or above 81°F (very oppressive).
Over the course of July typical wind speeds vary from 0 mph to 21 mph (calm to fresh breeze), rarely exceeding 29 mph (strong breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around July 2, at which time the average daily maximum wind speed is 21 mph (fresh breeze).
The lowest average wind speed of 8 mph (gentle breeze) occurs around July 31, at which time the average daily maximum wind speed is 20 mph (fresh breeze).