This report describes the typical weather at the Cozumel International Airport (Cozumel, Mexico) weather station over the course of an average May. It is based on the historical records from 1991 to 2012. Earlier records are either unavailable or unreliable.
Cozumel has a tropical monsoon climate with short dry season. The area within 25 mi of this station is covered by oceans and seas (69%) and forests (30%).
The month of May is characterized by essentially constant daily high temperatures, with daily highs around 88°F throughout the month, exceeding 92°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 12:54 hours of daylight; the longest day is May 31 with 13:17 hours of daylight.
The earliest sunrise is at 6:07am on May 31; the latest sunset is at 7:24pm on May 31; the latest sunrise is at 6:18am on May 1; the earliest sunset is at 7:12pm on May 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in May, so the entire month is in daylight time.
The median cloud cover ranges from 56% (partly cloudy) to 66% (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 May 1, the clearest day of the month, the sky is clear, mostly clear, or partly cloudy 31% of the time, and overcast or mostly cloudy 20% of the time.
On May 31, the cloudiest day of the month, the sky is overcast, mostly cloudy, or partly cloudy 42% of the time, and clear or mostly clear 7% of the time.
The probability that precipitation will be observed at this location varies throughout the month. Precipitation is most likely around May 31, occurring in 26% of days. Precipitation is least likely around May 1, occurring in 17% of days.
Throughout May, the most common forms of precipitation are light rain, moderate rain, thunderstorms, and drizzle.
Light rain is the most severe precipitation observed during 41% of those days with precipitation. It is most likely around May 28, when it is observed during 9% of all days.
Moderate rain is the most severe precipitation observed during 30% of those days with precipitation. It is most likely around May 31, when it is observed during 9% of all days.
Thunderstorms are the most severe precipitation observed during 13% of those days with precipitation. They are most likely around May 31, when it is observed during 4% of all days.
Drizzle is the most severe precipitation observed during 12% of those days with precipitation. It is most likely around May 28, when it is observed during 3% 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 58% (mildly humid) to 91% (very humid) over the course of a typical May, rarely dropping below 51% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around May 8, at which time the relative humidity drops below 62% (mildly humid) three days out of four; it is most humid around May 31, 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 79°F (oppressive).
Over the course of May typical wind speeds vary from 0 mph to 17 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 9 mph (gentle breeze) occurs around May 1, at which time the average daily maximum wind speed is 17 mph (moderate breeze).
The lowest average wind speed of 7 mph (light breeze) occurs around May 24, at which time the average daily maximum wind speed is 15 mph (moderate breeze).