This report describes the typical weather at the Cozumel International Airport (Cozumel, Mexico) weather station over the course of an average January. 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 January is characterized by essentially constant daily high temperatures, with daily highs around 81°F throughout the month, exceeding 86°F or dropping below 75°F only one day in ten.
Over the course of January, the length of the day is essentially constant. The shortest day of the month is January 4 with 10:56 hours of daylight; the longest day is January 31 with 11:14 hours of daylight.
The earliest sunrise is at 6:23am on January 1; the latest sunset is at 5:38pm on January 31; the latest sunrise is at 6:27am on January 16; the earliest sunset is at 5:19pm on January 1.
Daylight saving time is observed in 2012 but it neither starts nor ends in January, so the entire month is in standard time.
The median cloud cover is 53% (partly cloudy) and does not vary substantially over the course of the month.
On January 16, a representative day, the sky is clear or mostly clear 11% of the time, partly cloudy 21% of the time, and mostly cloudy or overcast 19% of the time.
The average probability that some form of precipitation will be observed in a given day is 18%, with little variation over the course of the month.
Throughout January, the most common forms of precipitation are light rain and moderate rain.
Light rain is the most severe precipitation observed during 53% of those days with precipitation. It is most likely around January 6, when it is observed during 10% of all days.
Moderate rain is the most severe precipitation observed during 32% of those days with precipitation. It is most likely around January 11, when it is observed during 6% of all days.
Either snow is exceptionally unlikely to fall at this location in January or this station does not reliably report precipitation types.
The relative humidity typically ranges from 63% (mildly humid) to 92% (very humid) over the course of a typical January, rarely dropping below 53% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around January 31, at which time the relative humidity drops below 69% (mildly humid) three days out of four; it is most humid around January 1, rising above 88% (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 January, the dew point typically varies from 64°F (mildy humid) to 71°F (very muggy) and is rarely below 56°F (comfortable) or above 76°F (very muggy).
Over the course of January typical wind speeds vary from 0 mph to 15 mph (calm to moderate breeze), rarely exceeding 23 mph (fresh breeze).
The highest average wind speed of 8 mph (gentle breeze) occurs around January 16, at which time the average daily maximum wind speed is 15 mph (moderate breeze).
The lowest average wind speed of 8 mph (light breeze) occurs around January 1, at which time the average daily maximum wind speed is 15 mph (moderate breeze).