This report describes the typical weather at the Luis Muñoz Marín International Airport (San Juan, Puerto Rico) weather station over the course of an average November. It is based on the historical records from 1992 to 2012. Earlier records are either unavailable or unreliable.
San Juan has a tropical rainforest climate with no dry season. The area within 25 mi of this station is covered by oceans and seas (48%), forests (30%), grasslands (12%), marshes (6%), and croplands (3%).
The month of November is characterized by gradually falling daily high temperatures, with daily highs around 85°F throughout the month, exceeding 89°F or dropping below 82°F only one day in ten.
Over the course of November, the length of the day is essentially constant. The shortest day of the month is November 30 with 11:07 hours of daylight; the longest day is November 1 with 11:27 hours of daylight.
The earliest sunrise is at 6:24am on November 1; the latest sunset is at 5:51pm on November 1; the latest sunrise is at 6:40am on November 30; the earliest sunset is at 5:45pm on November 23.
Daylight savings time (DST) is not observed in 2012.
The median cloud cover is 43% (partly cloudy) and does not vary substantially over the course of the month.
On November 15, a representative day, the sky is clear or mostly clear 42% of the time, partly cloudy 32% of the time, and mostly cloudy or overcast 21% of the time.
The average probability that some form of precipitation will be observed in a given day is 70%, with little variation over the course of the month.
Throughout November, the most common forms of precipitation are light rain, heavy rain, thunderstorms, and moderate rain.
Light rain is the most severe precipitation observed during 43% of those days with precipitation. It is most likely around November 29, when it is observed during 34% of all days.
Heavy rain is the most severe precipitation observed during 21% of those days with precipitation. It is most likely around November 26, when it is observed during 16% of all days.
Thunderstorms are the most severe precipitation observed during 19% of those days with precipitation. They are most likely around November 1, when it is observed during 19% of all days.
Moderate rain is the most severe precipitation observed during 17% of those days with precipitation. It is most likely around November 25, when it is observed during 13% of all days.
Either snow is exceptionally unlikely to fall at this location in November 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 November, rarely dropping below 55% (mildly humid) and reaching as high as 98% (very humid).
The air is driest around November 30, at which time the relative humidity drops below 69% (mildly humid) three days out of four; it is most humid around November 7, 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 November, the dew point typically varies from 68°F (muggy) to 75°F (very muggy) and is rarely below 65°F (mildy humid) or above 77°F (oppressive).
Over the course of November typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 19 mph (fresh breeze).
The highest average wind speed of 7 mph (light breeze) occurs around November 30, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 6 mph (light breeze) occurs around November 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).