This report describes the typical weather at the Ixtapa-Zihuatanejo International Airport (Ixtapa-Zihuatanejo, Mexico) weather station over the course of an average December. It is based on the historical records from 1981 to 2012. Earlier records are either unavailable or unreliable.
Ixtapa-Zihuatanejo has a tropical savanna climate with dry winters. The area within 25 mi of this station is covered by oceans and seas (47%), forests (37%), croplands (14%), and grasslands (3%).
The month of December 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 December, the length of the day is essentially constant. The shortest day of the month is December 23 with 11:04 hours of daylight; the longest day is December 1 with 11:10 hours of daylight.
The earliest sunrise is at 7:00am on December 1; the latest sunset is at 6:23pm on December 31; the latest sunrise is at 7:16am on December 30; the earliest sunset is at 6:10pm on December 2.
Daylight saving time is observed in 2012 but it neither starts nor ends in December, so the entire month is in standard time.
The median cloud cover ranges from 27% (mostly clear) to 34% (mostly clear). The trend is for the sky to be clearing with the median cloud cover decreasing by 7% from the start to the end of the month.
On December 16, a representative day, the sky is clear or mostly clear 26% of the time, partly cloudy 17% of the time, and mostly cloudy or overcast 13% of the time.
The average probability that some form of precipitation will be observed in a given day is 3%, with little variation over the course of the month.
Throughout December, the most common forms of precipitation are moderate rain, drizzle, and light rain.
Moderate rain is the most severe precipitation observed during 39% of those days with precipitation. It is most likely around December 1, when it is observed during 1% of all days.
Drizzle is the most severe precipitation observed during 35% of those days with precipitation. It is most likely around December 1, when it is observed during 1% of all days.
Light rain is the most severe precipitation observed during 16% of those days with precipitation. It is most likely around December 1, when it is observed during 1% of all days.
Either snow is exceptionally unlikely to fall at this location in December or this station does not reliably report precipitation types.
The relative humidity typically ranges from 60% (mildly humid) to 91% (very humid) over the course of a typical December, rarely dropping below 51% (mildly humid) and reaching as high as 100% (very humid).
The air is driest around December 28, at which time the relative humidity drops below 65% (mildly humid) three days out of four; it is most humid around December 25, 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 December, the dew point typically varies from 63°F (mildy humid) to 75°F (very muggy) and is rarely below 58°F (comfortable) or above 78°F (oppressive).
Over the course of December typical wind speeds vary from 0 mph to 12 mph (calm to gentle breeze), rarely exceeding 16 mph (moderate breeze).
The highest average wind speed of 3 mph (light air) occurs around December 31, at which time the average daily maximum wind speed is 12 mph (gentle breeze).
The lowest average wind speed of 3 mph (light air) occurs around December 9, at which time the average daily maximum wind speed is 11 mph (gentle breeze).